Computer Programming MCQs

As load on an induction motor goes on increasing______________?

A. Its power factor goes on decreasing
B. Its power factor remains constant
C. Its power factor goes on increasing even after full load
D. Its power factor goes on increasing up to full load and then it falls again

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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 squence of supply

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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

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The speed characteristics of an induction motor closely resemble the speedload characteristics of which of the following machines?

A. D.c. series motor
B. D.c. shunt motor
C. Universal motor
D. None of the above

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Which type of bearing is provided in small induction motors to support the rotor shaft ?

A. Ball bearings
B. Cast iron bearings
C. Bush bearings
D. None of the above

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A pump induction motor is switched on to a supply 30% lower than its rated voltage. The pump runs. What will eventually happen ? It will____________?

A. Stall after sometime
B. Stall immediately
C. Continue to run at lower speed without damage
D. Get heated and subsequently get damaged

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5 H.P., 50-Hz, 3-phase, 440 V, induction motors are available for the following r.p.m. Which motor will be the costliest ?

A. 730 r.p.m.
B. 960 r.p.m.
C. 1440 r.p.m.
D. 2880 r.p.m.

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A 3-phase slip ring motor has____________?

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

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The starting torque of a 3-phase squirrel cage induction motor is____________?

A. Twice the full load torque
B. 1.5 times the full load torque
C. Equal to full load torque

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Short-circuit test on an induction motor cannot be used to determine___________?

A. Windage losses
B. Copper losses
C. Transformation ratio
D. Power scale of circle diagram

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