The ‘cogging’ of an induction motor can be avoided by____________?

A. Proper ventilation
B. Using dol starter
C. Auto-transformer starter
D. Having number of rotor slots more or less than the number of stator slots (not equal)

The power factor of an induction motor under no-load conditions will be closer to_____________?

A. 0.2 lagging
B. 0.2 leading
C. 0.5 leading
D. Unity

The ‘crawling” in an induction motor is caused by___________?

A. High loads
B. Low voltage supply
C. Improper design of machine
D. Harmonics developed in the motor

The speed of a squirrel-cage induction motor can be controlled by all of the following except_____________?

A. Changing supply frequency
B. Changing number of poles
C. Changing winding resistance
D. Reducing supply voltage

DOL starting of induction motors is usually restricted to_____________?

A. Low horsepower motors
B. Variable speed motors
C. High horsepower motors
D. High speed motors

In a three-phase induction motor, the number of poles in the rotor winding is always__________?

A. Zero
B. More than the number of poles in stator
C. Less than number of poles in stator
D. Equal to number of poles in stator

In three-phase squirrel-cage induction motors____________?

A. Rotor conductor ends are short-circuited through slip rings
B. Rotor conductors are short-circuited through end rings
C. Rotor conductors are kept open
D. Rotor conductors are connected to insulation

The maximum torque in an induction motor depends on___________?

A. Frequency
B. Rotor inductive reactance
C. Square of supply voltage
D. All of the above

An induction motor is__________?

A. Self-starting with zero torque
B. Self-starting with high torque
C. Self-starting with low torque
D. Non-self starting

If any two phases for an induction motor are interchanged_______?

A. The motor will run in reverse direction
B. The motor will run at reduced speed
C. The motor will not run
D. The motor will burn