Three Phase Induction Motor

In three phase induction motor, which of the following component is usually fabricated of silicon steel

• Shaft

• Stator core

• Bearings

• None of the above

A three phase 440 volt, 50 hz induction motor has a slip of 4 percent. The frequency of the rotor current will be

• 25 Hz

• 2 Hz

• 50 Hz

• 5 Hz

In three phase squirrel cage induction motor we use

• Copper wire winding

• Copper bars winding

• Both above option

In which of the following three phase induction motor we can add external resistance in the rotor circuit

• Squirrel Cage Induction Motor

• Slip ring induction motor

• Phase wound induction motor

• Both 2nd & 3rd option

The principle of operation of three phase induction motor is similar to........

• Synchronous motor

• Repulsion start induction motor

• transformer with a shorted secondary

• capacitor start induction run motor.

Slip of IM can be written as

• Stator Cu loss/Rotor output

• Rotor Power/Rotor input

• Rotor Cu loss/Rotor input

• Rotor Cu loss/Rotor output

If slip value is less than 1, it means, the machine is

• motoring

• Braking

• Generating

• Transferring

No load test is used to obtain

• Slip

• Cu loss

• core loss

• efficiency

Short circuit test is used to obtain

• core loss

• Cu loss

• Slip

• Efficiency

The frequency of Indian power grid went upto ......on 5th April between 9 pm and 9:09 pm as part of Corona Unity Call by PM.

• 49.45 Hz

• 50.25 Hz

• 52.5 Hz

• 51.9 Hz