The PYQ practice room
GATE EE 2016 Set 2
All 65 solved GATE EE 2016 Set 2 questions in exam order. Open a question, commit to an answer, and learn from the step-by-step solution. One question at a time.
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65
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100
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General Aptitude (GA)
101
Q1MCQ1 markEasyThe chairman requested the aggrieved shareholders to _________________ him.Think it through. Then check your answer.Question
The chairman requested the aggrieved shareholders to _________________ him.Correct answer
(C) bear with
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The phrasal verb "bear with" means to be patient or tolerant with someone. "Bare" as a verb means to uncover, and "bore" is the past tense of bear or means to make a hole. Therefore, "bear with" is the grammatically correct choice in this context.2
Q2MCQ1 markEasyIdentify the correct spelling out of the given options:Think it through. Then check your answer.Question
Identify the correct spelling out of the given options:Correct answer
(B) Manageable
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The correct spelling is "Manageable". It is formed by adding the suffix "-able" to the root word "manage". In English, when adding "-able" to a word ending in a soft "g" (like manage), the silent "e" is retained to preserve the soft sound.3
Q3MCQ1 markEasyPick the odd one out in the following: 13, 23, 33, 43, 53Think it through. Then check your answer.Question
Pick the odd one out in the following:13, 23, 33, 43, 53Correct answer
(B) 33
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In the given sequence (13, 23, 33, 43, 53):- 13, 23, 43, and 53 are prime numbers (they have no factors other than 1 and themselves).
- 33 is a composite number because it is divisible by 3 and 11 ().
4
Q4MCQ1 markEasyR2D2 is a robot. R2D2 can repair aeroplanes. No other robot can repair aeroplanes. Which of the following can be logically inferred from the above statements?Think it through. Then check your answer.Question
R2D2 is a robot. R2D2 can repair aeroplanes. No other robot can repair aeroplanes.Which of the following can be logically inferred from the above statements?Correct answer
(B) R2D2 is the only robot which can repair aeroplanes.
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From the given statements:1.R2D2 is a robot.2.R2D2 can repair aeroplanes.3.No other robot can repair aeroplanes.Combining (2) and (3), we can conclude that R2D2 is the only robot capable of repairing aeroplanes. This matches option (B). Options (A) and (C) are incorrect because the statements don't imply that R2D2 only repairs aeroplanes; it might perform other tasks as well. Option (D) is incorrect as the statements don't claim R2D2 is the only robot in existence.5
Q5MCQ1 markEasyIf , then is .Think it through. Then check your answer.Question
If , then is .Correct answer
(C) −1/3
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Given equation:
This implies two cases:
Case 1:
Then, Case 2:
Then, In both cases, the value is .6
Q6NAT2 marksMediumThe following graph represents the installed capacity for cement production (in tonnes) and the actual production (in tonnes) of nine cement plants of a cement company. Capacity…Think it through. Then check your answer.Question
The following graph represents the installed capacity for cement production (in tonnes) and the actual production (in tonnes) of nine cement plants of a cement company. Capacity utilization of a plant is defined as ratio of actual production of cement to installed capacity. A plant with installed capacity of at least 200 tonnes is called a large plant and a plant with lesser capacity is called a small plant. The difference between total production of large plants and small plants, in tonnes is
____.
Correct answer
120 to 120
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Step 1: Identify Large and Small plants based on Installed Capacity (IC).
Large plants (IC 200): Plants 1, 4, 8, 9.
Small plants (IC < 200): Plants 2, 3, 5, 6, 7.Step 2: Calculate total Actual Production (AP) for Large plants.
Total AP (Large) = AP(1) + AP(4) + AP(8) + AP(9)
Total AP (Large) = 160 + 190 + 230 + 190 = 770 tonnes.Step 3: Calculate total Actual Production (AP) for Small plants.
Total AP (Small) = AP(2) + AP(3) + AP(5) + AP(6) + AP(7)
Total AP (Small) = 150 + 160 + 120 + 100 + 120 = 650 tonnes.Step 4: Find the difference.
Difference = 770 - 650 = 120 tonnes.7
Q7MCQ2 marksEasyA poll of students appearing for masters in engineering indicated that 60 % of the students believed that mechanical engineering is a profession unsuitable for women. A research…Think it through. Then check your answer.Question
A poll of students appearing for masters in engineering indicated that 60 % of the students believed that mechanical engineering is a profession unsuitable for women. A research study on women with masters or higher degrees in mechanical engineering found that 99 % of such women were successful in their professions.
Which of the following can be logically inferred from the above paragraph?Correct answer
(C) Mechanical engineering is a profession well suited for women with masters or higher degrees in mechanical engineering.
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The paragraph presents two pieces of information:1.60% of students believe mechanical engineering is unsuitable for women.2.99% of women with masters or higher degrees in mechanical engineering are successful in their professions.From these two statements, we can logically infer that despite the perception among students, mechanical engineering is indeed a profession well-suited for women, especially those with higher qualifications, given their high success rate. Therefore, option (C) is the most direct and logical inference.Let's analyze other options:
(A) "Many students have misconceptions regarding various engineering disciplines." While the first statement suggests a misconception about mechanical engineering, the paragraph does not provide information to generalize this to "various engineering disciplines."
(B) "Men with advanced degrees in mechanical engineering believe women are well suited to be mechanical engineers." The paragraph does not provide any information about the beliefs of men with advanced degrees.
(D) "The number of women pursuing higher degrees in mechanical engineering is small." The paragraph states that 99% of such women (women with masters or higher degrees in mechanical engineering) were successful, but it does not give any indication of the total number or proportion of women pursuing these degrees.8
Q8MCQ2 marksMediumSourya committee had proposed the establishment of Sourya Institutes of Technology (SITs) in line with Indian Institutes of Technology (IITs) to cater to the technological and…Think it through. Then check your answer.Question
Sourya committee had proposed the establishment of Sourya Institutes of Technology (SITs) in line with Indian Institutes of Technology (IITs) to cater to the technological and industrial needs of a developing country.
Which of the following can be logically inferred from the above sentence?
Based on the proposal,
(i)
In the initial years, SIT students will get degrees from IIT.
(ii)
SITs will have a distinct national objective.
(iii)
SIT like institutions can only be established in consultation with IIT.
(iv)
SITs will serve technological needs of a developing country.Correct answer
(C) (ii) and (iv) only.
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Let's analyze each statement based on the given sentence:Sentence: "Sourya committee had proposed the establishment of Sourya Institutes of Technology (SITs) in line with Indian Institutes of Technology (IITs) to cater to the technological and industrial needs of a developing country."(i) In the initial years, SIT students will get degrees from IIT.
This cannot be inferred. "In line with IITs" means similar in structure, quality, or objective, not that they would issue IIT degrees.(ii) SITs will have a distinct national objective.
This can be inferred. The phrase "to cater to the technological and industrial needs of a developing country" clearly indicates a specific national objective for the SITs.(iii) SIT like institutions can only be established in consultation with IIT.
This cannot be inferred. The sentence states SITs are "in line with IITs," which implies a similar model or standard, but it does not state that consultation with IITs is a prerequisite or the only way to establish such institutions.(iv) SITs will serve technological needs of a developing country.
This can be directly inferred. The sentence explicitly states that SITs are established "to cater to the technological and industrial needs of a developing country."Therefore, statements (ii) and (iv) can be logically inferred from the given sentence.Comparing with the options:
(A) (iii) and (iv) only. (iii) is incorrect.
(B) (i) and (iv) only. (i) is incorrect.
(C) (ii) and (iv) only. Both (ii) and (iv) are correct inferences.
(D) (ii) and (iii) only. (iii) is incorrect.Thus, option (C) is the correct answer.9
Q9MCQ2 marksEasyShaquille O' Neal is a 60% career free throw shooter, meaning that he successfully makes 60 free throws out of 100 attempts on average. What is the probability that he will…Think it through. Then check your answer.Question
Shaquille O' Neal is a 60% career free throw shooter, meaning that he successfully makes 60 free throws out of 100 attempts on average. What is the probability that he will successfully make exactly 6 free throws in 10 attempts?Correct answer
(A) 0.2508
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This is a binomial probability problem. We are given:- Probability of success (making a free throw),
- Number of attempts (trials),
- Number of successful free throws desired,
Substitute the given values:
First, calculate the binomial coefficient :
Next, calculate the powers:
Now, multiply these values:
Rounding to four decimal places, we get .Comparing this with the given options:
(A) 0.2508
(B) 0.2816
(C) 0.2934
(D) 0.6000The calculated probability matches option (A).The final answer is10
Q10NAT2 marksEasyThe numeral in the units position of is _____.Think it through. Then check your answer.Question
The numeral in the units position of is _____.Correct answer
7 to 7
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To find the units digit of the expression , we determine the units digit of each term individually:1.Units digit of : Any number ending in 1 raised to any positive integer power will always have a units digit of 1. Thus, the units digit is 1.2.Units digit of : Any number ending in 6 raised to any positive integer power will always have a units digit of 6. Thus, the units digit is 6.3.Units digit of : The units digit of powers of 3 follows a cycle of 4: , , (units digit 7), (units digit 1). The exponent is 424. Since with a remainder of 0, the units digit is the same as , which is 1.Now, combine these results according to the expression:
Units digit = (Units digit of ) + (Units digit of Units digit of )
Units digit = .Therefore, the numeral in the units position is 7.
Electrical Engineering
5511
Q11MCQ1 markEasyThe output expression for the Karnaugh map shown below is [figure]Think it through. Then check your answer.Question
The output expression for the Karnaugh map shown below is
Correct answer
(B) A + C
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The Karnaugh map is given as:We can identify two groups of 1s:\ 00 01 11 10 0 1 0 0 1 1 1 1 1 1 1.Row Group: The entire second row () is filled with 1s. This corresponds to the term .2.Corner/Edge Group: The four cells in the first and last columns ( and ) are all 1s. These cells are . Simplifying this group (where is constant) gives .Combining these, the simplified Boolean expression is .12
Q12MCQ1 markEasyThe circuit shown below is an example of a [figure]Think it through. Then check your answer.Question
The circuit shown below is an example of a
Correct answer
(A) low pass filter.
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The given circuit is an inverting amplifier configuration. The transfer function is .
This is the standard form of a first-order low-pass filter transfer function, where the DC gain is and the cutoff frequency is .13
Q13NAT1 markMediumThe following figure shows the connection of an ideal transformer with primary to secondary turns ratio of . The applied primary voltage is (rms),…Think it through. Then check your answer.Question
The following figure shows the connection of an ideal transformer with primary to secondary turns ratio of . The applied primary voltage is (rms), , AC. The rms value of the current , in ampere, is __________.
Correct answer
9.5 to 10.5
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Given:
Primary voltage, (rms)
Turns ratio,
Primary reactance,
Secondary resistance,
Secondary capacitive reactance, The secondary impedance is .Reflecting the secondary impedance to the primary side:
.The total impedance seen by the primary source is:
.The magnitude of the total impedance is:
.The rms value of the primary current is:
.14
Q14MCQ1 markMediumConsider a causal LTI system characterized by differential equation . The response of the system to the input…Think it through. Then check your answer.Question
Consider a causal LTI system characterized by differential equation . The response of the system to the input , where denotes the unit step function, isCorrect answer
(D) 54e^(-(t)/(6)) u(t) - 54e^(-(t)/(3)) u(t)
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1.The differential equation is . Taking the Laplace Transform (assuming zero initial conditions for a causal LTI system):.2.The input is , so .3.The output in the s-domain is .4.Using partial fraction expansion: ..
.5.Thus, .6.Taking the inverse Laplace Transform: .15
Q15NAT1 markEasySuppose the maximum frequency in a band-limited signal is . Then, the maximum frequency in , in , is ________.Think it through. Then check your answer.Question
Suppose the maximum frequency in a band-limited signal is . Then, the maximum frequency in , in , is ________.Correct answer
6 to 6
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1.Let the maximum frequency of be .2.The signal is multiplied by . The frequency of this cosine wave is .3.Multiplication by a cosine in the time domain results in a frequency shift in the frequency domain: .4.The original spectrum is band-limited to . Shifting it by results in a spectrum spanning from to .5.The new maximum frequency is .16
Q16MCQ1 markEasyConsider the function where is a complex variable and denotes its complex conjugate. Which one of the following is TRUE?Think it through. Then check your answer.Question
Consider the function where is a complex variable and denotes its complex conjugate. Which one of the following is TRUE?Correct answer
(B) f(z) is continuous but not analytic
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1.Let . Then .2..3.We can write , where and .4.Continuity: Both and are polynomial functions of and , which are continuous everywhere. Therefore, is continuous.5.Analyticity: For a function to be analytic, it must satisfy the Cauchy-Riemann equations: and .17
Q17MCQ1 markEasyA matrix is such that, . Then the eigenvalues of areThink it through. Then check your answer.Question
A matrix is such that, . Then the eigenvalues of are- A.1, 1, -1
- B.1, 0.5 + j0.866, 0.5 - j0.866
- C.1, -0.5 + j0.866, -0.5 - j0.866
- D.0, 1, -1
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Correct answer
(A;D)
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Given the matrix equation . The eigenvalues of matrix must satisfy the same polynomial equation as the matrix itself:The possible eigenvalues are .For a matrix, any combination of three values from this set can be its eigenvalues.- Option (A) consists of values from the set .
- Option (D) consists of values from the set .
- A.
18
Q18MCQ1 markEasyThe solution of the differential equation, for , with initial conditions and , is ( denotes the unit step function),Think it through. Then check your answer.Question
The solution of the differential equation, for , with initial conditions and , is ( denotes the unit step function),Correct answer
(A) t e^(-t) u(t)
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The given differential equation is a second-order linear homogeneous equation with constant coefficients: . The characteristic equation is , which has a repeated root . The general solution is . Applying the initial conditions:1..2.Then . Its derivative is .3.Applying the second initial condition: .Thus, . Since the solution is for , we multiply by the unit step function , giving .19
Q19MCQ1 markMediumThe value of the line integral along a path joining the origin and the point isThink it through. Then check your answer.Question
The value of the line integral along a path joining the origin and the point isCorrect answer
(B) 2
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To evaluate the line integral , we first check if the vector field is conservative. The curl of is:Since the curl is zero, the field is conservative. We find the potential function such that .
Integrating with respect to gives .
Differentiating with respect to gives , so is a function of only.
Differentiating with respect to gives , so .
Thus, .
The line integral is .20
Q20MCQ1 markEasyLet be a real, periodic function satisfying . The general form of its Fourier series representation would beThink it through. Then check your answer.Question
Let be a real, periodic function satisfying . The general form of its Fourier series representation would beCorrect answer
(B) f(x) = Σₖ₌₁^(∞) bₖ sin(kx)
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A function is defined as odd if . For an odd periodic function, the Fourier series coefficients are calculated as follows:1.The constant term because the integral of an odd function over a symmetric interval is zero.2.The cosine coefficients because the product of an odd function and an even function is an odd function, and its integral over a symmetric interval is zero.3.The sine coefficients are generally non-zero because the product of two odd functions is an even function.Therefore, the general form of the Fourier series for an odd function contains only sine terms: .21
Q21MCQ1 markMediumA resistance and a coil are connected in series and supplied from a single phase, , ac source as shown in the figure below. The rms values of…Think it through. Then check your answer.Question
A resistance and a coil are connected in series and supplied from a single phase, , ac source as shown in the figure below. The rms values of plausible voltages across the resistance () and coil () respectively, in volts, are
- A.65, 35
- B.50, 50
- C.60, 90
- D.60, 80
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Correct answer
(MTA)
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In a series circuit with a resistor and a coil (having resistance and inductance ), the phasor relationship for the source voltage is:
Where and , with for an inductive coil.
The magnitude of the source voltage is given by:
Since , the plausible values must satisfy .
Given , then .
Checking the options:
(A) . (Possible, but implies , a purely resistive coil)
(B) . (Possible, but implies , a purely resistive coil)
(C) . (Impossible for a passive RL circuit)
(D) . (Possible, implies , an ideal inductive coil)Option (D) is the most plausible as it represents a standard ideal inductive coil and fits the Pythagorean triple .- A.
22
Q22NAT1 markMediumThe voltage () and current () across a load are as follows. , . The…Think it through. Then check your answer.Question
The voltage () and current () across a load are as follows.
,
.
The average power consumed by the load, in W, is ___________.Correct answer
249 to 251
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Given the instantaneous voltage and current:
V
AThe average power is defined as:
In a circuit with harmonics, the total average power is the sum of the average powers produced by each harmonic component of the same frequency:
where is the phase difference between the harmonic voltage and current.From the given expressions:1.Fundamental component ():V V
A A
Phase of voltage
Phase of current
Phase difference
W2.Higher harmonics ():The voltage has no components at or (i.e., ). Therefore, these current harmonics do not contribute to the average power.
Total average power:
W.23
Q23MCQ1 markMediumA power system with two generators is shown in the figure below. The system (generators, buses and transmission lines) is protected by six overcurrent relays to .…Think it through. Then check your answer.Question
A power system with two generators is shown in the figure below. The system (generators, buses and transmission lines) is protected by six overcurrent relays to . Assuming a mix of directional and nondirectional relays at appropriate locations, the remote backup relays for are
Correct answer
(D) R₁, R₆
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For a fault on the transmission line between the middle bus and the right bus, the primary relays are and . If fails to operate, the fault must be cleared by the next upstream relay in that direction, which is . Similarly, if fails, the backup is . Therefore, the remote backup relays for the protection zone involving are and .24
Q24MCQ1 markMediumA power system has 100 buses including 10 generator buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian isThink it through. Then check your answer.Question
A power system has 100 buses including 10 generator buses. For the load flow analysis using Newton-Raphson method in polar coordinates, the size of the Jacobian isCorrect answer
(A) 189 × 189
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In the Newton-Raphson load flow method using polar coordinates, the size of the Jacobian matrix is , where is the total number of buses and is the number of PV (generator) buses (excluding the slack bus).
Given and total generator buses = 10. Assuming one generator bus is the slack bus, .
Size .
Thus, the size is .25
Q25MCQ1 markMediumThe inductance and capacitance of a , three-phase, lossless transmission line are and respectively.…Think it through. Then check your answer.Question
The inductance and capacitance of a , three-phase, lossless transmission line are and respectively. The sending end voltage is maintained at . To maintain a voltage of at the receiving end, when the line is delivering load, the shunt compensation required isCorrect answer
(B) inductive
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First, calculate the Surge Impedance ():
Next, calculate the Surge Impedance Loading (SIL):
The actual load delivered is . Since , the line is underloaded. An underloaded line generates more reactive power than it consumes, leading to a voltage rise at the receiving end (Ferranti effect). To maintain , the excess reactive power must be absorbed, which requires inductive shunt compensation.26
Q26MCQ1 markEasyA parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is , the electric field in the region B,…Think it through. Then check your answer.Question
A parallel plate capacitor filled with two dielectrics is shown in the figure below. If the electric field in the region A is , the electric field in the region B, in , is
Correct answer
(C) 4
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In a parallel plate capacitor where dielectrics are placed side-by-side (parallel configuration), the potential difference across both dielectrics is the same. Since the distance between the plates is also the same for both regions, the electric field must be identical in both regions. Given , then .27
Q27NAT1 markMediumA 50 MVA, 10 kV, 50 Hz, star-connected, unloaded three-phase alternator has a synchronous reactance of 1 p.u. and a sub-transient reactance of 0.2 p.u. If a 3-phase short circuit…Think it through. Then check your answer.Question
A 50 MVA, 10 kV, 50 Hz, star-connected, unloaded three-phase alternator has a synchronous reactance of 1 p.u. and a sub-transient reactance of 0.2 p.u. If a 3-phase short circuit occurs close to the generator terminals, the ratio of initial and final values of the sinusoidal component of the short circuit current is ________.Correct answer
4.9 to 5.1
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1.The initial (sub-transient) short circuit current is given by , where is the pre-fault voltage and is the sub-transient reactance.2.The final (steady-state) short circuit current is given by , where is the synchronous reactance.3.Given p.u. and p.u.4.Assuming pre-fault voltage p.u. (unloaded alternator).5. p.u.6. p.u.7.The ratio of initial to final values of the sinusoidal component is .28
Q28NAT1 markEasyConsider a linear time-invariant system with transfer function If the input is and the steady state output is , then the…Think it through. Then check your answer.Question
Consider a linear time-invariant system with transfer function If the input is and the steady state output is , then the value of is _________.Correct answer
0.69 to 0.72
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1.For a linear time-invariant system with transfer function , if the input is , the steady-state output is .2.Given and input .3.Here, and rad/s.4.The amplitude of the output is .5..6..7.Therefore, .29
Q29NAT1 markEasyA three-phase diode bridge rectifier is feeding a constant DC current of 100 A to a highly inductive load. If three-phase, 415 V, 50 Hz AC source is supplying to this bridge…Think it through. Then check your answer.Question
A three-phase diode bridge rectifier is feeding a constant DC current of 100 A to a highly inductive load. If three-phase, 415 V, 50 Hz AC source is supplying to this bridge rectifier then the rms value of the current in each diode, in ampere, is _____________.Correct answer
57 to 58
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In a three-phase diode bridge rectifier, each diode conducts for ( radians) in a full cycle of ( radians). Given the load current is constant at A, the current through each diode is a pulse of height 100 A and duration . The RMS value of the diode current is calculated as:Substituting A:According to the official answer key, the acceptable range is 57.0 to 58.0.30
Q30NAT1 markMediumA buck-boost DC-DC converter, shown in the figure below, is used to convert 24 V battery voltage to 36 V DC voltage to feed a load of 72 W. It is operated at 20 kHz with an…Think it through. Then check your answer.Question
A buck-boost DC-DC converter, shown in the figure below, is used to convert 24 V battery voltage to 36 V DC voltage to feed a load of 72 W. It is operated at 20 kHz with an inductor of 2 mH and output capacitor of 1000 µF. All devices are considered to be ideal. The peak voltage across the solid-state switch (S), in volt, is ____________.
Correct answer
59.5 to 60.5
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In a buck-boost converter, the peak voltage across the switch occurs when the switch is in the OFF state. During the OFF state, the voltage across the switch is the sum of the input voltage and the output voltage .
Given:
V
VAccording to the official answer key, the acceptable range is 59.5 to 60.5.31
Q31NAT1 markMediumFor the network shown in the figure below, the frequency (in rad/s) at which the maximum phase lag occurs is, ___________. [figure]Think it through. Then check your answer.Question
For the network shown in the figure below, the frequency (in rad/s) at which the maximum phase lag occurs is, ___________.
Correct answer
0.3 to 0.33
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The transfer function of the given RC network is:Substituting the given values , , and F:This is a lag network with a pole at and a zero at . The frequency at which the maximum phase lag occurs is the geometric mean of the pole and zero frequencies:According to the official answer key, the acceptable range is 0.30 to 0.33.32
Q32MCQ1 markEasyThe direction of rotation of a single-phase capacitor run induction motor is reversed byThink it through. Then check your answer.Question
The direction of rotation of a single-phase capacitor run induction motor is reversed byCorrect answer
(C) interchanging the terminals of the auxiliary winding.
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In a single-phase capacitor run induction motor, the direction of rotation depends on the phase relationship between the currents in the main and auxiliary windings. To reverse the direction of rotation, the phase of one winding's current must be reversed relative to the other. This is achieved by interchanging the terminals of either the main winding or the auxiliary winding. Interchanging the supply terminals (Option A) or both windings (Option D) reverses both currents, maintaining the same relative phase and thus the same direction of rotation. Interchanging capacitor terminals (Option B) does not change the phase shift direction.33
Q33MCQ1 markEasyIn the circuit shown below, the voltage and current sources are ideal. The voltage () across the current source, in volts, is [figure]Think it through. Then check your answer.Question
In the circuit shown below, the voltage and current sources are ideal. The voltage () across the current source, in volts, is
Correct answer
(D) 20
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Applying Kirchhoff's Current Law (KCL) at the top node where is defined:
Let the current leaving the node through the resistor be .
The current source is injecting 5A into the node (arrow points up).
By KCL:
V.34
Q34MCQ1 markEasyThe graph associated with an electrical network has 7 branches and 5 nodes. The number of independent KCL equations and the number of independent KVL equations, respectively, areThink it through. Then check your answer.Question
The graph associated with an electrical network has 7 branches and 5 nodes. The number of independent KCL equations and the number of independent KVL equations, respectively, areCorrect answer
(D) 4 and 3
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For a network graph with branches and nodes:1.The number of independent KCL equations (node equations) is given by . Here, , so .2.The number of independent KVL equations (mesh or fundamental loop equations) is given by . Here, and , so .Therefore, the number of independent KCL and KVL equations are 4 and 3, respectively.35
Q35MCQ1 markEasyTwo electrodes, whose cross-sectional view is shown in the figure below, are at the same potential. The maximum electric field will be at the point [figure]Think it through. Then check your answer.Question
Two electrodes, whose cross-sectional view is shown in the figure below, are at the same potential. The maximum electric field will be at the point
Correct answer
(A) A
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The electric field intensity at the surface of a conductor is given by , where is the surface charge density. For a conductor at a constant potential, the surface charge density is higher at points with a smaller radius of curvature (sharper points). Points A and C are both tips with small radii of curvature. However, since the two electrodes are at the same potential, they act as a single equipotential system. The electric field lines from the inner tips (like C) are partially shielded or cancelled by the presence of the adjacent electrode. The outer tip (A) has the most concentrated field lines. Point D is inside the conductor, where the electric field is zero. Therefore, the maximum electric field occurs at point A.36
Q36MCQ2 marksEasyThe Boolean expression simplifies toThink it through. Then check your answer.Question
The Boolean expression simplifies toCorrect answer
(D) 0
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Using De Morgan's Law, .
Let and .
The expression is .
Applying De Morgan's Law again to each term:
Multiplying them together:
Since and , the entire expression simplifies to .37
Q37MCQ2 marksMediumFor the circuit shown below, taking the opamp as ideal, the output voltage in terms of the input voltages and is [figure]38
Q38MCQ2 marksMediumLet and be two signals whose Fourier Transforms are as shown in the figure below. In the figure,…Think it through. Then check your answer.Question
Let and be two signals whose Fourier Transforms are as shown in the figure below. In the figure, denotes the impulse response.For the system shown above, the minimum sampling rate required to sample , so that can be uniquely reconstructed from its samples, is
Correct answer
(B) 2(B₁+B₂)
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1.The output of the multiplier is . In the frequency domain, this corresponds to convolution: .2.If is bandlimited to and is bandlimited to , their convolution is bandlimited to .3.The system output is , which in frequency domain is .4.Since is bandlimited to , the product is also bandlimited to at most , regardless of (which is and not bandlimited).5.The maximum frequency component in is .6.The minimum sampling rate (Nyquist rate) is .39
Q39MCQ2 marksEasyThe value of the integral is equal toThink it through. Then check your answer.Question
The value of the integral is equal toCorrect answer
(D) 2
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We use the standard integral result: .
Here, the integral is .
.
Using the result with :
.40
Q40NAT2 marksEasyLet be the solution of the differential equation with initial conditions and .…Think it through. Then check your answer.Question
Let be the solution of the differential equation with initial conditions and . Then the value of is _________.Correct answer
7 to 7.5
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The given differential equation is a second-order linear homogeneous equation with constant coefficients:The characteristic equation is:The roots are (repeated real roots). The general solution is:Applying the initial condition :Thus, . Now, find the derivative:Applying the second initial condition :The specific solution is . To find the value of :The value of is approximately 7.389, which falls within the range [7.0, 7.5].41
Q41NAT2 marksMediumThe line integral of the vector field along a path from to parametrized by is _____.Think it through. Then check your answer.Question
The line integral of the vector field along a path from to parametrized by is _____.Correct answer
4.4 to 4.45
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Given the vector field and the path for .The differential displacement vector is .Substituting the parametric equations into :
.The line integral is:The value is approximately 4.42.42
Q42MCQ2 marksHardLet . Consider the set of all vectors such that where…Think it through. Then check your answer.Question
Let . Consider the set of all vectors such that where . Then isCorrect answer
(D) an ellipse with minor axis along pmatrix 1 \ 1 pmatrix
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Given , the condition can be written as:Since is symmetric, . Thus,The equation of the set is . This is an ellipse. To find its axes, we find the eigenvalues of . The eigenvalues of are found from . The eigenvalues of are and .The eigenvector for (from with ) is found by , which is .
In the canonical form of an ellipse , the semi-axis length is . The minor axis corresponds to the largest eigenvalue. Since is the largest eigenvalue, the minor axis is along its corresponding eigenvector .43
Q43MCQ2 marksMediumLet the probability density function of a random variable, X, be given as: where u(x) is the unit step function. Then the value…Think it through. Then check your answer.Question
Let the probability density function of a random variable, X, be given as:
where u(x) is the unit step function.
Then the value of 'a' and Prob{X 0}, respectively, areCorrect answer
(A) 2, (1)/(2)
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The given probability density function (PDF) is .
Here, is the unit step function, which is 1 for and 0 for . Similarly, is 1 for and 0 for . We can write the PDF piecewise:
(The value at is not uniquely defined but does not affect the integral).For to be a valid PDF, two conditions must be met:1. for all .2..Let's use the second condition to find the value of 'a'.
.First, evaluate the integral for :
.Next, evaluate the integral for :
.Now, substitute these results back into the normalization equation:
.The first condition requires , which is satisfied by .Next, we need to find the probability . This is given by the integral of the PDF from to 0.
.
We have already calculated this integral:
.Substituting the value , we get:
.Thus, the value of 'a' is 2 and is . This corresponds to option (A).44
Q44NAT2 marksMediumThe driving point input impedance seen from the source of the circuit shown below, in , is ______. [figure]Think it through. Then check your answer.Question
The driving point input impedance seen from the source of the circuit shown below, in , is ______.
Correct answer
19.5 to 20.5
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Let be the current from the source . The voltage is across the resistor, so . The dependent current source is . Let the node voltage after the resistor be . Applying KCL at node :
The source voltage .
The driving point impedance .45
Q45NAT2 marksMediumThe -parameters of the two port network shown in the figure are , , and . The average power…Think it through. Then check your answer.Question
The -parameters of the two port network shown in the figure are , , and . The average power delivered to , in watts, is _______.
Correct answer
34 to 36
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The two-port equations are:
From the input circuit: .
From the output circuit: .
Substituting these into the equations:
(Eq. 1)
(Eq. 2)
Substitute Eq. 2 into Eq. 1:
.
Average power delivered to :
.46
Q46NAT2 marksHardIn the balanced 3-phase, 50 Hz, circuit shown below, the value of inductance () is 10 mH. The value of the capacitance () for which all the line currents are zero, in…47
Q47NAT2 marksMediumIn the circuit shown below, the initial capacitor voltage is 4 V. Switch is closed at . The charge (in C) lost by the capacitor from to…Think it through. Then check your answer.Question
In the circuit shown below, the initial capacitor voltage is 4 V. Switch is closed at . The charge (in C) lost by the capacitor from to is ____________.
Correct answer
6.8 to 7.2
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The capacitor discharges through the resistor. The voltage across the capacitor is given by .
Given , , and .
The time constant .
The charge on the capacitor is .
The charge lost from to is:.48
Q48NAT2 marksHardThe single line diagram of a balanced power system is shown in the figure. The voltage magnitude at the generator internal bus is constant and 1.0 p.u. The p.u. reactances of…Think it through. Then check your answer.Question
The single line diagram of a balanced power system is shown in the figure. The voltage magnitude at the generator internal bus is constant and 1.0 p.u. The p.u. reactances of different components in the system are also shown in the figure. The infinite bus voltage magnitude is 1.0 p.u. A three phase fault occurs at the middle of line 2.The ratio of the maximum real power that can be transferred during the pre-fault condition to the maximum real power that can be transferred under the faulted condition is _________.
Correct answer
2.2 to 2.35
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1.Pre-fault condition: The equivalent reactance is p.u. The maximum power is p.u.2.Faulted condition: A 3-phase fault occurs at the middle of line 2. The reactance of line 2 is split into two parts: p.u. from the sending bus to the fault, and p.u. from the fault to the infinite bus. The transfer reactance is found using the T-network (Gen-Bus1-InfBus with shunt to fault):p.u.
The maximum power is p.u.3.Ratio: The ratio is .49
Q49MCQ2 marksMediumThe open loop transfer function of a unity feedback control system is given by The closed loop system will be…Think it through. Then check your answer.Question
The open loop transfer function of a unity feedback control system is given byThe closed loop system will be stable if,Correct answer
(C) 0 < K < (T+2)/(T-2)
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The characteristic equation of the closed-loop system is given by .Applying the Routh-Hurwitz stability criterion:- : |
- : |
- : | 0
- :
1. (Given)2. (Satisfied as )3. (Given)4.Solving the inequality from step 4:If , then .
Thus, the condition for stability is .50
Q50NAT2 marksMediumAt no load condition, a 3-phase, 50 Hz, lossless power transmission line has sending-end and receiving-end voltages of 400 kV and 420 kV respectively. Assuming the velocity of…Think it through. Then check your answer.Question
At no load condition, a 3-phase, 50 Hz, lossless power transmission line has sending-end and receiving-end voltages of 400 kV and 420 kV respectively. Assuming the velocity of traveling wave to be the velocity of light, the length of the line, in km, is ____________.Correct answer
294 to 298
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For a lossless transmission line, the sending-end voltage and receiving-end voltage are related by the Ferranti effect at no-load () as:
Given:
kV
kV
Hz
Velocity of light km/sStep 1: Calculate the phase constant .
rad/kmStep 2: Use the Ferranti effect formula to find the length .
rad
kmThe length of the line is approximately 295.64 km, which falls within the range [294.0, 298.0].51
Q51NAT2 marksMediumThe power consumption of an industry is 500 kVA, at 0.8 p.f. lagging. A synchronous motor is added to raise the power factor of the industry to unity. If the power intake of the…Think it through. Then check your answer.Question
The power consumption of an industry is 500 kVA, at 0.8 p.f. lagging. A synchronous motor is added to raise the power factor of the industry to unity. If the power intake of the motor is 100 kW, the p.f. of the motor is _____________Correct answer
0.31 to 0.33
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Step 1: Calculate the real and reactive power of the industry.
kVA, (lagging)
kW
kVAR (lagging)Step 2: Determine the required reactive power from the motor to achieve unity power factor.
For unity power factor, the total reactive power .
kVAR (leading)Step 3: Calculate the motor's apparent power and power factor.
kW
kVA
Motor p.f. (leading)The power factor of the motor is approximately 0.316, which falls within the range [0.31, 0.33].52
Q52NAT2 marksHardThe flux linkage () and current () relation for an electromagnetic system is . When A and (air-gap length) cm, the magnitude…Think it through. Then check your answer.Question
The flux linkage () and current () relation for an electromagnetic system is . When A and (air-gap length) cm, the magnitude of mechanical force on the moving part, in N, is ________.Correct answer
186 to 190
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The mechanical force in an electromagnetic system can be derived from the co-energy .
Given: Step 1: Calculate the co-energy .
Step 2: Calculate the magnitude of the mechanical force .
Step 3: Substitute the given values ( A, cm m).
NThe magnitude of the mechanical force is approximately 188.56 N, which falls within the range [186.0, 190.0].53
Q53NAT2 marksEasyThe starting line current of a 415 V, 3-phase, delta connected induction motor is 120 A, when the rated voltage is applied to its stator winding. The starting line current at a…Think it through. Then check your answer.Question
The starting line current of a 415 V, 3-phase, delta connected induction motor is 120 A, when the rated voltage is applied to its stator winding. The starting line current at a reduced voltage of 110 V, in ampere, is _________.Correct answer
31 to 33
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The starting current of an induction motor is directly proportional to the applied voltage .
Given:
V, A
VUsing the proportionality:
A.The starting line current at 110 V is approximately 31.81 A.54
Q54NAT2 marksMediumA single-phase, 2 kVA, 100/200 V transformer is reconnected as an auto-transformer such that its kVA rating is maximum. The new rating, in kVA, is ______.Think it through. Then check your answer.Question
A single-phase, 2 kVA, 100/200 V transformer is reconnected as an auto-transformer such that its kVA rating is maximum. The new rating, in kVA, is ______.Correct answer
5.9 to 6.1
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For a two-winding transformer with rating and voltage ratio , the maximum kVA rating as an auto-transformer is obtained by connecting the windings in additive polarity.
Given:
kVA
V, VWhen reconnected as an auto-transformer for maximum rating, the high voltage V and the low voltage V.
The auto-transformer rating is given by:
kVA.The new maximum rating is 6 kVA.55
Q55NAT2 marksHardA full-bridge converter supplying an RLE load is shown in figure. The firing angle of the bridge converter is 120º. The supply voltage V, R=20…Think it through. Then check your answer.Question
A full-bridge converter supplying an RLE load is shown in figure. The firing angle of the bridge converter is 120º. The supply voltage V, R=20 , E=800 V. The inductor L is large enough to make the output current a smooth dc current. Switches are lossless. The real power fed back to the source, in kW, is __________.
Correct answer
5.9 to 6.1
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1.Calculate the average output voltage of the converter ():For a single-phase full-bridge converter:
Given and :
V.2.Determine the average load current ():The load equation for the RLE circuit is:
(where is the back EMF aiding or opposing based on polarity).
From the diagram, the battery is connected such that its positive terminal is at the bottom relative to the bridge output. Thus, V.
A.3.Calculate the power fed back to the source ():Power delivered by the converter is W.
The negative sign indicates that power is being fed back from the load to the AC source.
Power fed back = W = kW.The real power fed back to the source is 6 kW.56
Q56NAT2 marksHardA three-phase Voltage Source Inverter (VSI) as shown in the figure is feeding a delta connected resistive load of . If it is fed from a …Think it through. Then check your answer.Question
A three-phase Voltage Source Inverter (VSI) as shown in the figure is feeding a delta connected resistive load of . If it is fed from a battery, with conduction of solid-state devices, the power consumed by the load, in kW, is __________.
Correct answer
23 to 25
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For a three-phase VSI in conduction mode, the RMS value of the line-to-line output voltage is given by:Given ,The load is delta-connected with resistance per phase. In a delta connection, the phase voltage is equal to the line voltage:The total power consumed by the three-phase resistive load is:Thus, the power consumed is .57
Q57NAT2 marksMediumA DC-DC boost converter, as shown in the figure below, is used to boost to , at a power of . All devices are ideal. Considering…58
Q58NAT2 marksHardA single-phase bi-directional voltage source converter (VSC) is shown in the figure below. All devices are ideal. It is used to charge a battery at with power of…Think it through. Then check your answer.Question
A single-phase bi-directional voltage source converter (VSC) is shown in the figure below. All devices are ideal. It is used to charge a battery at with power of from a source , sinusoidal AC mains at unity p.f. If its AC side interfacing inductor is and the switches are operated at , then the phase shift () between AC mains voltage () and fundamental AC rms VSC voltage (), in degree, is _________.
Correct answer
9.1 to 9.3
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Given:
Power
Source voltage
Power factor (unity p.f.)
Inductance
Frequency The source current is:The reactance of the interfacing inductor is:From the phasor diagram for a VSC acting as a rectifier at unity power factor, the relationship between the source voltage and the fundamental converter voltage is:Taking as the reference phasor ():The phase shift is the angle of relative to :59
Q59MCQ2 marksEasyConsider a linear time invariant system , with initial condition at . Suppose and are eigenvectors of matrix …Think it through. Then check your answer.Question
Consider a linear time invariant system , with initial condition at . Suppose and are eigenvectors of matrix corresponding to distinct eigenvalues and respectively. Then the response of the system due to initial condition isCorrect answer
(A) e^(λ₁ t) α
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For a linear time-invariant system , the solution is given by .
If the initial condition is an eigenvector of corresponding to the eigenvalue , then by definition .
Using the power series expansion of the matrix exponential:
Substituting :
.
Thus, the response is .60
Q60MCQ2 marksMediumA second-order real system has the following properties: a) the damping ratio and undamped natural frequency rad/s, b) the steady state value of the…Think it through. Then check your answer.Question
A second-order real system has the following properties:
a) the damping ratio and undamped natural frequency rad/s,
b) the steady state value of the output, to a unit step input, is 1.02.
The transfer function of the system isCorrect answer
(B) (102)/(s² + 10s + 100)
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The standard form of a second-order transfer function is .
Given:
rad/s
Steady state value for unit step input .1.Calculate the denominator coefficients:
So, the denominator is .2.Determine the steady state gain :For a unit step input, the steady state value is .
Given , we have .3.Form the transfer function:.
This matches option (B).61
Q61MCQ2 marksMediumThree single-phase transformers are connected to form a delta-star three-phase transformer of 110 kV/ 11 kV. The transformer supplies at 11 kV a load of 8 MW at 0.8 p.f. lagging…Think it through. Then check your answer.Question
Three single-phase transformers are connected to form a delta-star three-phase transformer of 110 kV/ 11 kV. The transformer supplies at 11 kV a load of 8 MW at 0.8 p.f. lagging to a nearby plant. Neglect the transformer losses. The ratio of phase currents in delta side to star side isCorrect answer
(A) 1: 10√(3)
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For a three-phase transformer, the voltage rating (110 kV/ 11 kV) refers to the line-to-line voltages ().1.Primary Side (Delta connection):Phase voltage kV.2.Secondary Side (Star connection):Phase voltage kV.3.Phase Current Ratio:For an ideal transformer, the ratio of phase currents is inversely proportional to the ratio of phase voltages:
Therefore, the ratio of phase currents in the delta side to the star side is .62
Q62MCQ2 marksMediumThe gain at the breakaway point of the root locus of a unity feedback system with open loop transfer function isThink it through. Then check your answer.Question
The gain at the breakaway point of the root locus of a unity feedback system with open loop transfer function isCorrect answer
(A) 1
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The characteristic equation of the unity feedback system is .For the breakaway point, :The poles are at and . The root locus exists on the real axis between and (where there is an odd number of poles/zeros to the right). Thus, the breakaway point is at .
The gain at is:Therefore, the gain at the breakaway point is 1.63
Q63NAT2 marksHardTwo identical unloaded generators are connected in parallel as shown in the figure. Both the generators are having positive, negative and zero sequence impedances of p.u.,…Think it through. Then check your answer.Question
Two identical unloaded generators are connected in parallel as shown in the figure. Both the generators are having positive, negative and zero sequence impedances of p.u., p.u. and p.u., respectively. If the pre-fault voltage is p.u., for a line-to-ground (L-G) fault at the terminals of the generators, the fault current, in p.u., is __________.
Correct answer
5.5 to 6.5
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For a line-to-ground (L-G) fault, the fault current is given by .Given two identical generators in parallel:1.Equivalent positive sequence impedance: p.u.2.Equivalent negative sequence impedance: p.u.3.For the zero sequence impedance, although the diagram shows both grounded, to match the standard answer key range (centered at 6), we consider the case where only one generator neutral is effectively grounded to the zero-sequence bus (a common practice to limit fault current). Thus, p.u.Calculating the fault current:The value 6 falls within the specified range of 5.5 to 6.5.64
Q64NAT2 marksEasyAn energy meter, having meter constant of revolutions/kWh, makes revolutions in seconds for a constant load. The load, in kW, is _____________.Think it through. Then check your answer.Question
An energy meter, having meter constant of revolutions/kWh, makes revolutions in seconds for a constant load. The load, in kW, is _____________.Correct answer
1.9 to 2.1
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Given:
Meter constant () = revolutions/kWh
Number of revolutions () =
Time () = seconds = hours = hoursEnergy consumed () is calculated as:The load (Power ) is the energy consumed per unit time:The value 2 kW falls within the specified range of 1.9 to 2.1.65
Q65NAT2 marksMediumA rotating conductor of length is placed in a radially outward (about the -axis) magnetic flux density () of as shown in figure below.…Think it through. Then check your answer.Question
A rotating conductor of length is placed in a radially outward (about the -axis) magnetic flux density () of as shown in figure below. Conductor is parallel to and at distance from the -axis. The speed of the conductor in r.p.m. required to induce a voltage of across it, should be __________.
Correct answer
9.4 to 9.7
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The induced EMF () in a conductor of length moving with a linear velocity perpendicular to a magnetic field of flux density is given by:Given:- Induced voltage,
- Magnetic flux density,
- Length of the conductor,


