Crawling & Cogging in Induction Motor - MCQs with Answers

Crawling & Cogging in Induction Motor - MCQs with Answers

Q1. Crawling in an induction motor is caused

a. During starting of an induction motor
b. At the fraction of rated speed
c. Due to insulation failure
d. All of these

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Q2. Cogging in an induction motor is caused

a. If the number of stator slots are integral multiple of rotor slots
b. If the motor is running at fraction of its rated speed
c. Due to fifth harmonic
d. All of these

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Q3. Crawling is a phenomena mainly associated with

a. 3^rd harmonic
b. 5^th harmonic
c. 7^th harmonic
d. 2^nd harmonic

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Q4. What happens if the number of stator slots in an induction motor is equal to the number of rotor slots or integral multiple of rotor slots?

a. Motor will run at very high speed
b. Motor will run at very low speed
c. Motor will fail to start
d. Does not get effected

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Q5. The crawling and cogging is not predominant in

a. Slip ring induction motor
b. Squirrel cage induction motor
c. Both (a) and (b)
d. None of these

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