Polyphase Induction Motors MCQ Questions & Answers

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A 3-phase induction motor delta connected is carrying too heavy load and one of its fuses blows out. Then the motor

A) Will continue running burning its one phase B) Will continue running burning its two phase C) Will stop and carry heavy current causing permanent damage to its winding D) Will continue running without any harm to the winding

Discuss

Answer & Solution

Answer: Option C

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

Star-delta starting of motors is not possible in case of

A) Single phase motors B) Variable speed motors C) Low horse power motors D) High speed motors

Discuss

Answer & Solution

Answer: Option A

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

In an induction motor the relationship between stator slots and rotor slots is that

A) Stator slots are equal to rotor slots B) Stator slots are exact multiple of rotor slots C) Stator slots are not exact multiple of rotor slots D) None of the above

Discuss

Answer & Solution

Answer: Option C

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

A 3-phase slip ring motor has

A) Double cage rotor B) Wound rotor C) Short-circuited rotor D) Any of the above

Discuss

Answer & Solution

Answer: Option B

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

Low voltage at motor terminals is due to

A) Inadequate motor wiring B) Poorly regulated power supply C) Any one of the above D) None of the above

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Answer & Solution

Answer: Option C

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

A 500 kW, 3-phase, 440 volts, 50 Hz, A.C. induction motor has a speed of 960 r.p.m. on full load. The machine has 6-poles. The slip of the machine will be

A) 0.01 B) 0.02 C) 0.03 D) 0.04

Discuss

Answer & Solution

Answer: Option D

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

It is advisable to avoid line starting of induction motor and use starter because

A) It will run in reverse direction B) It will pick up very high speed and may go out of step C) Motor takes five to seven times its full load current D) Starting torque is very high

Discuss

Answer & Solution

Answer: Option C

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

Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor?

A) By changing the number of stator poles B) Rotor rheostat control C) By operating two motors in cascade D) By injecting e.m.f. in the rotor circuit

Discuss

Answer & Solution

Answer: Option A

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

In three-phase squirrel-cage induction motors

A) Rotor conductor ends are short-circuited through slip rings B) Rotor conductors are short-circuited through end rings C) Rotor conductors are kept open D) Rotor conductors are connected to insulation

Discuss

Answer & Solution

Answer: Option B

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

In an induction motor if air-gap is increased

A) The power factor will be low B) Windage losses will be more C) Bearing friction will reduce D) Copper loss will reduce in an induction motor

Discuss

Answer & Solution

Answer: Option A

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

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Polyphase Induction Motors MCQ Questions & Answers | Electrical Engineering