Question 1

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be

Accepted Answer

A) at the end connections 
B) at the end terminals 
C) anywhere on the winding inside a slot 
D) at the slot edge where coil enters or comes out of the slot 
A) at the end connections 
B) at the end terminals 
C) anywhere on the winding inside a slot 
D) at the slot edge where coil enters or comes out of the slot

Question 2

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will

Accepted Answer

A) start and then stop 
B) start and run slowly 
C) start and run at rated speed 
D) not start at all 
A) start and then stop 
B) start and run slowly 
C) start and run at rated speed 
D) not start at all

Question 3

In capacitor start single-phase motors

Accepted Answer

A) current in the starting winding leads the voltage 
B) current in the starting winding lags the voltage 
C) current in the starting winding is in phase with voltage in running winding 
D) none of the above 
A) current in the starting winding leads the voltage 
B) current in the starting winding lags the voltage 
C) current in the starting winding is in phase with voltage in running winding 
D) none of the above

Question 4

The direction of rotation of an hysteresis motor is determined by

Accepted Answer

A) interchanging the supply leads 
B) position of shaded pole with respect to main pole 
C) retentivity of the rotor material 
D) none of these 
A) interchanging the supply leads 
B) position of shaded pole with respect to main pole 
C) retentivity of the rotor material 
D) none of these

Question 5

If the capacitor of a single-phase motor is short-circuited

Accepted Answer

A) the motor will not start 
B) the motor will run 
C) the motor will run in reverse direction 
D) the motor will run in the same direction at reduced r.p.m. 
A) the motor will not start 
B) the motor will run 
C) the motor will run in reverse direction 
D) the motor will run in the same direction at reduced r.p.m.

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will

In capacitor start single-phase motors

The direction of rotation of an hysteresis motor is determined by

If the capacitor of a single-phase motor is short-circuited

Motor Types and Applications

Electric Motors and Their Characteristics

Motor Types and Applications

Single-Phase Induction Motors and Their Features

Filters

Exam 1: Single-Phase Motor

The running winding of a single phase motor on testing with meggar is found to be ground. Most probable location of the ground will be

A capacitor-start single phase induction motor is switched on to supply with its capacitor replaced by an inductor of equivalent reactance value. It will

In capacitor start single-phase motors

The direction of rotation of an hysteresis motor is determined by

If the capacitor of a single-phase motor is short-circuited

Motor Types and Applications

Electric Motors and Their Characteristics

Motor Types and Applications

Single-Phase Induction Motors and Their Features

Filters