Polyphase Induction Motors MCQ Questions & Answers

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The purpose of using short-circuit gear is

A) To short circuit the rotor at slip rings B) To short circuit the starting resistances in the starter C) To short circuit the stator phase of motor to form star D) None of the above

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Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Insertion of reactance in the rotor circuit

A) Reduces starting torque as well as maximum torque B) Increases starting torque as well as maximum torque C) Increases starting torque but maximum torque remains unchanged D) Increases starting torque but maximum torque decreases

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Answer & Solution

Answer: Option A

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The maximum torque in an induction motor depends on

A) Frequency B) Rotor inductive reactance C) Square of supply voltage D) All of the above

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Answer & Solution

Answer: Option D

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The shaft of an induction motor is made of

A) High speed steel B) Stainless steel C) Carbon steel D) Cast iron

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Answer & Solution

Answer: Option C

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The number of slip rings on a squirrel cage induction motor is usually

A) Two B) Three C) Four D) None

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Answer & Solution

Answer: Option D

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A squirrel cage induction motor is not selected when

A) Initial cost is the main consideration B) Maintenance cost is to be kept low C) Higher starting torque is the main consideration D) All above considerations are involved

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Answer & Solution

Answer: Option C

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Slip ring motor is recommended where

A) Speed control is required B) Frequent starting, stopping and reversing is required C) High starting torque is needed D) All above features are required

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Answer & Solution

Answer: Option D

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If a 3-phase supply is given to the stator and rotor is short circuited rotor will move

A) In the opposite direction as the direction of the rotating field B) In the same direction as the direction of the field C) In any direction depending upon phase sequence of supply D) None of these

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Answer & Solution

Answer: Option B

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Lubricant used for ball bearing is usually

A) Graphite B) Grease C) Mineral oil D) Molasses

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Answer & Solution

Answer: Option B

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For which motor the speed can be controlled from rotor side?

A) Squirrel-cage induction motor B) Slip-ring induction motor C) Both (A) and (B) D) None of the above

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Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

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Polyphase Induction Motors MCQ Questions & Answers | Electrical Engineering