A reluctance motor

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

A

Become unstable

B

Draw excessive armature current and may burn out

C

Fall out of synchronism and come to stand still

D

Run as induction motor

Which of the following statements regarding reluctance-start motor is incorrect ?

A

It is similar to reluctance motor

B

It is basically an induction motor and not a synchronous one

C

So far as its basic working principle is concerned, it is similar to shaded pole motor

D

the air-gap between rotor and salient poles is non- uniform

For which of the applications a reluctance motor is preferred ?

A

Electric shavers

B

Refrigerators

C

Signalling and timing devices

D

Lifts and hoists

Which of the following statements regarding a reluctance motor is incorrect ?

A

It cannot be reversed, ordinarily

B

It requires no D.C. field excitation for its operation

C

It is nothing else but a single-phase, salient pole synchronous-induction motor

D

Its squirrel cage-rotor is of unsym-metrical magnetic construction in order to vary reluc-tance path between stator and rotor

Reluctance motor is a

A

Variable torque motor

B

Low torque variable speed motor

C

Self starting type synchronous motor

D

Low noise, slow speed motor

Of the 120 households in an area, 55 have cars, 35 have motor bikes, and 20 have both cars and motor bikes. How many of the households in the area have neither cares nor motor bikes?

A

110

B

90

C

50

D

30

A motor pool has 300 vehicles of which 30% are trucks. 20% of all the vehicles in the motor pool are diesel, including 15 trucks. What percent of the motor pool is composed of vehicles that are neither trucks nor diesel?

A

165%

B

90%

C

65%

D

10%

By looking at which part of the motor, it can be easily confirmed that a particular motor is D.C. motor?

A

Frame

B

Shaft

C

Commutator

D

Stator

One D.C. motor drives another D.C. motor. The second D.C. motor when excited and driven

A

Runs as a generator

B

Does not run as a generator

C

Also runs as a motor comes to stop after sometime

D

None of these

Flywheel is used with D.C. compound motor to reduce the peak demand by the motor, compound motor will have to be

A

Level compounded

B

Under compounded

C

Cumulatively compounded

D

Differentially compounded

A reluctance motor

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