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Polyphase Induction Motors MCQ Questions & Answers | Electrical Engineering

Learn Polyphase Induction Motors MCQ questions & answers are available for a Electrical Engineering students to clear GATE exams, various technical interview, competitive examination, and another entrance exam. Polyphase Induction Motors MCQ question is the important chapter for a Electrical Engineering and GATE students. Page-4 section-1

31
Insertion of resistance in the stator of an induction motor
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Answer & Solution
Answer: Option B
No explanation is given for this question. Let's Discuss on Board
32
In a star-delta starter of an induction motor
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Answer & Solution
Answer: Option D
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33
The shape of the torque/slip curve of induction motor is
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Answer: Option C
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34
The auto-starters (using three auto transformers) can be used to start cage induction motor of the following type
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Answer & Solution
Answer: Option C
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35
In squirrel cage induction motors, the rotor slots are usually given slight skew in order to
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Answer & Solution
Answer: Option D
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36
In a three-phase induction motor
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Answer: Option B
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37
In the circle diagram for induction motor, the diameter of the circle represents
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Answer: Option B
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38
In a squirrel cage motor the induced e.m.f. is
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Answer: Option C
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39
Size of a high speed motor as compared to low speed motor for the same H.P. will be
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Answer: Option B
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40
In an induction motor, no-load the slip is generally
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Answer & Solution
Answer: Option A
Solution:
In an induction motor, the slip is defined as the difference between the synchronous speed and the actual rotor speed, expressed as a percentage of the synchronous speed. At no-load conditions, the slip of an induction motor is typically very small because the rotor speed is very close to the synchronous speed.

Less than 1 %: At no-load, the slip is generally less than 1% because the rotor speed approaches the synchronous speed very closely when the motor is not under load.

1.5 %, 2 %, and 4 %: These values are higher and more characteristic of conditions when the motor is under load. At no-load, these slips would be too high, which does not align with the typical performance of induction motors at no-load conditions.

Thus, Option A: Less than 1 % is the correct choice.