Question 1

Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed

Accepted Answer

A) 30 to 40 
B) 70 to 80 
C) 80 to 90 
D) 100 
A) 30 to 40 
B) 70 to 80 
C) 80 to 90 
D) 100 B

Question 2

To reverse the direction of rotation of acapacitor start motor while it is running we should

Accepted Answer

A) disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding 
B) disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding 
C) reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply 
D) reverse the direction of connections of the auxiliary winding and im-mediately connect it to supply 
A) disconnect motor from the supply till it stops then reconnect it to supply with reversed connection of main or auxiliary winding 
B) disconnect motor from supply and immediately reconnect it to supply with reversed connections of the main winding 
C) reverse the direction of connection of the auxiliary winding and after motor comes to rest then connect auxiliary winding to the supply 
D) reverse the direction of connections of the auxiliary winding and im-mediately connect it to supply A

Question 3

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

Accepted Answer

A) become unstable 
B) draw excessive armature current and may burn out 
C) fall out of synchronism and come to stand still 
D) run as induction motor 
A) become unstable 
B) draw excessive armature current and may burn out 
C) fall out of synchronism and come to stand still 
D) run as induction motor D

Question 4

Which of the following motors is used in a situation where load increases with speed ?

Accepted Answer

A) Induction motor 
B) Three-phase series motor 
C) Schrage motor 
D) Hysteresis motor 
A) Induction motor 
B) Three-phase series motor 
C) Schrage motor 
D) Hysteresis motor

Question 5

Which of the following motors has two separate windings on the motor ?

Accepted Answer

A) Repulsion motor 
B) Repulsion induction motor 
C) Repulsion start induction run motor 
D) None of the above 
A) Repulsion motor 
B) Repulsion induction motor 
C) Repulsion start induction run motor 
D) None of the above

Question 6

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

Accepted Answer

A) worn bearings 
B) short-circuit in the winding 
C) open-circuit in the winding 
D) none of the above 
A) worn bearings 
B) short-circuit in the winding 
C) open-circuit in the winding 
D) none of the above

Question 7

A repulsion motor is equipped with

Accepted Answer

A) slip rings 
B) commutator 
C) both (a) and (b) 
D) none of the above 
A) slip rings 
B) commutator 
C) both (a) and (b) 
D) none of the above

Question 8

Most of the fractional horsepower motors have either

Accepted Answer

A) hard and annealed bearings 
B) ball or roller bearings 
C) soft and porous bearings 
D) plain or sleeve bearings 
A) hard and annealed bearings 
B) ball or roller bearings 
C) soft and porous bearings 
D) plain or sleeve bearings

Question 9

Which of the following motors is used in tape-recorders ?

Accepted Answer

A) Hysteresis motor 
B) Reluctance motor 
C) Capacitor-run motor 
D) Universal motor 
A) Hysteresis motor 
B) Reluctance motor 
C) Capacitor-run motor 
D) Universal motor

Question 10

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

Accepted Answer

A) motor will not come upto speed 
B) motor will not carry the load 
C) current drawn by the motor will be excessively high 
D) electrolytic capacitor will, in all probability, suffer break down 
A) motor will not come upto speed 
B) motor will not carry the load 
C) current drawn by the motor will be excessively high 
D) electrolytic capacitor will, in all probability, suffer break down

Question 11

If a D.C. series motor is operated on A.C. supply, it will

Accepted Answer

A) spark excessively 
B) have poor efficiency 
C) have poor power factor 
D) all of the above 
A) spark excessively 
B) have poor efficiency 
C) have poor power factor 
D) all of the above

Question 12

Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because

Accepted Answer

A) it is comparatively cheaper 
B) it has almost non-destructible capacitor 
C) it has low starting as well as running currents at relatively high power factor 
D) it is quiet in operation 
A) it is comparatively cheaper 
B) it has almost non-destructible capacitor 
C) it has low starting as well as running currents at relatively high power factor 
D) it is quiet in operation

Question 13

In repulsion motor, zero torque is developed when

Accepted Answer

A) brush axis is 45° electrical to field axis 
B) brush axis coincides with the field axis 
C) brush axis is 90° electrical to field axis 
D) both (b) and (c) 
A) brush axis is 45° electrical to field axis 
B) brush axis coincides with the field axis 
C) brush axis is 90° electrical to field axis 
D) both (b) and (c)

Question 14

Which of the following statements regarding two value capacitor motor is incorrect ?

Accepted Answer

A) It is a reversing motor 
B) It is preferred to permanent-split single-value capacitor motor where frequent reversals are required 
C) It has low starting as well as rush¬ing currents 
D) It has high starting torque 
A) It is a reversing motor 
B) It is preferred to permanent-split single-value capacitor motor where frequent reversals are required 
C) It has low starting as well as rush¬ing currents 
D) It has high starting torque

Question 15

In a universal motor, the most common cause of brush sparking is

Accepted Answer

A) open armature winding 
B) shorted armature winding 
C) shorted field winding" 
D) all of the above 
A) open armature winding 
B) shorted armature winding 
C) shorted field winding" 
D) all of the above

Question 16

A shaded pole motor does not possess

Accepted Answer

A) centrifugal switch 
B) capacitor 
C) commutator 
D) all of the above 
A) centrifugal switch 
B) capacitor 
C) commutator 
D) all of the above

Question 17

The capacitors used in single-phase capacitor motors have no

Accepted Answer

A) voltage rating 
B) dielectric medium 
C) polarity marking 
D) definite value 
A) voltage rating 
B) dielectric medium 
C) polarity marking 
D) definite value

Question 18

The motor used for the compressors is

Accepted Answer

A) d.c. series motor 
B) shaded pole motor 
C) capacitor-start capacitor-run motor 
D) reluctance motor 
A) d.c. series motor 
B) shaded pole motor 
C) capacitor-start capacitor-run motor 
D) reluctance motor

Question 19

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

Accepted Answer

A) run faster 
B) spark at light loads 
C) draw excessive current and overheat 
D) run slower 
A) run faster 
B) spark at light loads 
C) draw excessive current and overheat 
D) run slower

Question 20

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

Accepted Answer

A) magnetic relay 
B) thermal relay 
C) centrifugal switch 
D) none of the above 
A) magnetic relay 
B) thermal relay 
C) centrifugal switch 
D) none of the above

Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed

To reverse the direction of rotation of acapacitor start motor while it is running we should

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

Which of the following motors is used in a situation where load increases with speed ?

Which of the following motors has two separate windings on the motor ?

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

A repulsion motor is equipped with

Most of the fractional horsepower motors have either

Which of the following motors is used in tape-recorders ?

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

If a D.C. series motor is operated on A.C. supply, it will

Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because

In repulsion motor, zero torque is developed when

Which of the following statements regarding two value capacitor motor is incorrect ?

In a universal motor, the most common cause of brush sparking is

A shaded pole motor does not possess

The capacitors used in single-phase capacitor motors have no

The motor used for the compressors is

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

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

Single-Phase Motor

Motor Types and Applications

Electric Motors and Their Characteristics

Single-Phase Induction Motors and Their Features

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Exam 4: Motor Types and Applications

Centrifugal switch disconnects the auxiliary winding of the motor at about ____ percent of synchronous speed

To reverse the direction of rotation of acapacitor start motor while it is running we should

In case of a reluctance motor, when the load is increased so that it cannot maintain synchronous speed the motor will

Which of the following motors is used in a situation where load increases with speed ?

Which of the following motors has two separate windings on the motor ?

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

A repulsion motor is equipped with

Most of the fractional horsepower motors have either

Which of the following motors is used in tape-recorders ?

If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

If a D.C. series motor is operated on A.C. supply, it will

Two-value capacitor motor finds increased application as compressor motor in small home air-conditioners because

In repulsion motor, zero torque is developed when

Which of the following statements regarding two value capacitor motor is incorrect ?

In a universal motor, the most common cause of brush sparking is

A shaded pole motor does not possess

The capacitors used in single-phase capacitor motors have no

The motor used for the compressors is

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

Starting winding of a single phase motor of a refrigerator is disconnected from the circuit by means of a

Single-Phase Motor

Motor Types and Applications

Electric Motors and Their Characteristics

Single-Phase Induction Motors and Their Features

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