SSC JE EE: Electrical Machine Booster Quiz-6

The motor used on small lathes is usually?

When the value of slip of an induction motor approaches zero, the effective resistance

Rotor slot of the squirrel cage induction motor are skewed slightly, so as to

The speed of the motor exceeds the synchronous speed for braking. This type of braking method is known as

The slip of an induction motor while conducting blocked rotor test will be:

In a 4 pole 50 Hz single-phase induction motor, if the rotor rotating with forward slip of 0.05 then find rotor frequency due to backward rotating field.

In a slip ring inductor motor, resistance is connected in rotor phase to:

Which of the following statements is / are correct with regard to three phase induction motor?

1) In cascading of two induction motor speed control technique, one induction motor must be squirrel cage while the other can be either slip ring or squirrel cage motor.

2) By increasing rotor resistance, starting torque and maximum torque increases.

3) Pole changing speed control technique can be used only in squirrel cage induction motor.

4) Cogging and crawling phenomenon are usually not encountered in slip ring induction motor

Each of the following statements regarding a shaded pole motor is true except:

Which of the following properties is correct about servomotor.