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

Which of the following statements regarding two value capacitor motor is incorrect ?

A

It is a reversing motor

B

It is preferred to permanent-split single-value capacitor motor where frequent reversals are required

C

It has low starting as well as rushing currents

D

It has high starting torque

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

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

A

It requires more maintenance of commutator and other mechanical devices

B

It makes quite a bit of noise on starting

C

In fractional horse power motors, it has replaced the capacitor motors

D

It is not easily reversed

Which of the following statements regarding hysteresis motor is in incorrect ?

A

It is extremely sensitive to fluctuations in supply voltage

B

Its high starting torque is due to its high rotor hysteresis loss

C

It is extremely quiet in operation

D

It accelerates from rest to full-speed almost instantaneously

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

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

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 synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will

A

remain same

B

go down

C

improve

D

none of the above

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

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