GATE EE 2014 Set 3 — Question 35
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Electrical Machines → DC Machines → Generator & Motor Characteristics
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Question
The torque-speed characteristics of motor () and load () for two cases are shown in the figures (a) and (b). The load torque is equal to motor torque at points P, Q, R and S
The stable operating points are
The stable operating points are
Correct answer
(B) P and S
Solution
Stability of an operating point in a drive system is determined by the condition .
1.In figure (a), at point P, the slope of the load torque and the slope of the motor torque . Since , P is a stable operating point. At Q, , so is false, making Q unstable.
2.In figure (b), at point S, the slope of the load torque is greater than the slope of the motor torque (the load curve is steeper). Thus, S is stable. At R, the motor torque curve is steeper than the load torque curve, making R unstable.
Therefore, the stable operating points are P and S.Continue learning with Success Tracker
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