Single phase motor. Part – 1

1. Which of the following motors is inherently self starting?

A. Split motor

B. Shaded pole motor

C. Reluctance motor

D. None of these

2. Direction of rotation of a split phase motor can be reversed by reversing the connection of

A. Running winding only

B. Starting winding only

C. Either a and b

D. Both a and b

3. If a single phase induction motor runs at a speed lower then the rated one, the most likely defects is

A. Improper size fuses

B. Worn out bearings or low voltage or overload

C. Open circuit in the winding

D. Short circuit in the winding

4. The starting torque of a single phase induction motor is,

A. Very high

B. Zero

C. Equal to full load torque

D. None of the these

5. The motor used in household refrigerators is

A. DC series motor

B. DC shunt motor

C. Universal  motor

D. Single phase induction motor

6. In ceiling fan which motor is used.

A. Shaded pole motor

B. Resistance start induction run motor

C. Capacitor start capacitor run I.M.

D. Capacitor start induction run I.M.

7. In shaded pole motor, shading coils are used to

A. Reduce winding losses

B. Reduce friction losses

C. Produce rotating magnetic field

D. Protect against sparking

8. In a shaded pole motor, the rotating field is developed by using

A. Salient poles

B. A capacitor

C. Shading coils

D. Damper winding

9. Single phase induction motor are made self starting by

A. Increasing rotor resistance

B. Using an external starting device

C. Providing an additional winding on the stator called the auxiliary winding

D. Any of the above method

10. A repulsion motor is equipped with

A. Slip-rings

B. Centrifugal switch

C. Commutators and brushses

D. All of the above