Question 1

The repulsion-start induction-run motor is used because of
A)good power factor
B)high efficiency
C)minimum cost
D)high starting torque

Accepted Answer

The repulsion-start induction-run motor is known for its high starting torque, which is a key advantage in applications requiring a significant amount of torque to start the motor.

Question 2

In case of a shaded pole motor the direction of rotation of the motor is
A)from main pole to shaded pole
B)from shaded pole to main pole
C)either of the above depending on voltage
D)either of the above depending on power factor

Accepted Answer

In a shaded pole motor, the direction of rotation is from the main pole to the shaded pole due to the phase shift created by the shading coil, which causes the magnetic field to rotate in that direction.

Question 3

In case of high speed universal motor which of the following needs more attention ?
A)End play
B)Air gap
C)Insulation in rotor
D)Balancing of rotor

Accepted Answer

Balancing of the rotor is crucial in high-speed universal motors to prevent vibration and ensure smooth operation. Unbalanced rotors can lead to excessive wear, noise, and potential failure of the motor.

Question 4

The wattage rating for a ceiling fan motor will be in the range
A)200 to 250 W
B)250 to 500 W
C)50 to 150 W
D)10 to 20 W

Accepted Answer

Ceiling fan motors typically have a low wattage rating, usually in the range of 50 to 150 W, because they are designed to be energy efficient while providing adequate airflow.

Question 5

The wattage of motor for driving domestic sewing machine will be around
A)100 to 150 W
B)40 to 75 W
C)10 to 30 W
D)5 to 10 W

Accepted Answer

The wattage of a motor for driving a domestic sewing machine typically ranges from 100 to 150 W. This range provides sufficient power for the machine to perform various sewing tasks efficiently.

Quiz 2: Motor Types and Applications

The repulsion-start induction-run motor is used because of

In case of a shaded pole motor the direction of rotation of the motor is

In case of high speed universal motor which of the following needs more attention ?

The wattage rating for a ceiling fan motor will be in the range

The wattage of motor for driving domestic sewing machine will be around