GATE EE 2023 Set 1 — Question 15
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Electrical Machines → Three-Phase Induction Machines → Slip & Equivalent Circuit
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Question
The following columns present various modes of induction machine operation and the ranges of slip
The correct matching between the elements in column A with those of column B is
| A (Mode of operation) | B (Range of Slip) |
|---|---|
| a. Running in generator mode | p) From 0.0 to 1.0 |
| b. Running in motor mode | q) From 1.0 to 2.0 |
| c. Plugging in motor mode | r) From -1.0 to 0.0 |
Correct answer
(A) a-r, b-p, and c-q
Solution
The slip of an induction machine is defined as , where is the synchronous speed and is the rotor speed.
1.Motor Mode: The rotor rotates in the same direction as the magnetic field but at a slower speed (). Thus, . This corresponds to range p.
2.Generator Mode: The rotor is driven by a prime mover in the same direction as the magnetic field but at a speed higher than synchronous speed (). Thus, is negative. Typically, for stable operation, it is in the range to . This corresponds to range r.
3.Plugging (Braking) Mode: The rotor is rotating in the opposite direction to the magnetic field ( is negative). Thus, . This corresponds to range q (From 1.0 to 2.0).
Matching: a-r, b-p, c-q.Continue learning with Success Tracker
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