Single phase induction motor usually operates on

The power factor of a single-phase induction motor is usually

A

lagging

B

always leading

C

unity

D

unity to 0.8 leading

A wound rotor induction motor is preferred, as compared to squirrel cage induction motor, when major consideration is

A

Slop speed operation

B

High starting torque

C

Low windage losses

D

All of the above

A synchronous motor installed at the receiving end substation operates with such an excitation that it takes power at lagging power factor. Now if the applied voltage of the synchronous motor goes down, the power factor of the synchronous motor will

A

remain same

B

go down

C

improve

D

none of the above

While starting a synchronous motor by induction motor action, field winding is usually

A

connected to D.C. supply

B

short-circuited by low resistance

C

kept open-circuited

D

none of the above

A single-phase induction motor is

A

inherently self-starting with high torque

B

inherently self-starting with low torque

C

inherently non-self-starting with low torque

D

inherently non-self-starting with high torque

After the starting winding of a single phase induction motor is disconnected from supply, it continues to run only on

A

running winding

B

rotor winding

C

field winding

D

compensating winding

Torque developed by a single phase induction motor at starting is

A

pulsating

B

uniform

C

none of the above

D

nil

If a single phase induction motor runs slower than normal, the most likely defect is

A

worn bearings

B

short-circuit in the winding

C

open-circuit in the winding

D

none of the above

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

A

start and then stop

B

start and run slowly

C

start and run at rated speed

D

not start at all

If starting winding of a single-phase induction motor is left in the circuit, it will

A

run faster

B

spark at light loads

C

draw excessive current and overheat

D

run slower

Single phase induction motor usually operates on

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