AC MOTORES – Air – DGCA Question Bank For Politics

#1. Synchronous motors are usually supplied by:

three phase AC

single phase AC

DC to the stator

DC to the stator and AC to the rotor.

#2. Reversing two phases to a three phase motor will:

blow the phase fuses.

cause the motor to run in reverse.

overheat the stator windings

stall the motor.

#3. A synchronous motor runs at a speed that depends upon the supply:

voltage

current

reactance

frequency

#4. If one phase of the supply to a three phase motor fails, then

the motor will continue to run at the same speed.

will slow down and stop

will stop immediately

will run at about half speed but will not start on its next selection.

#5. The basic principle of operation of a 3 phase induction motor is:

A rotating field created in the rotor.

A rotating field created in the stator.

A stationary field created in the stator.

A stationary field created in the rotor.

#6. In an induction motor:

the rotor is star connected.

magnetic fields blend evenly with one another

AC is induced in the rotor.

a DC supply produces DC in the rotor

#7. In a synchronous motor, the rotor is:

energised by DC and it lines up with the magnetic field in the stator.

wave wound

both AC and DC energised.

impeded by the AC induced into it.

#8. An induction motor has:

slip rings and brushes.

a commutator.

no slip ring or brushes.

slip rings but no brushes.

#9. A squirrel cage rotor:

is not connected to the supply.

is expensive to produce

rotates at exactly synchronous speed.

is a closed circuit of high resistance

#10. A starting circuit for a powerful single phase induction motor might be:

a capacitance starter.

a resistance / inductance starter.

a cartridge starter.

a bump starter.

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