Single Phase Induction Motor Quiz | Single Phase Induction Motor Multiple Choice Questions and Answers

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Questions
1 Which of the following motors is inherently self starting ?
A Split motor
B Shaded-pole motor
C Reluctance motor
D None of these

Answer: Shaded-pole motor
2 Which of the following motors is used in mixies ?
A Repulsion motor
B Reluctance motor
C Hysteresis motor
D Universal motor

Answer: Universal motor
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3 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
A start and then stop
B start and run slowly
C start and run at rated speed
D not start at all

Answer: not start at all
4 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 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

Answer: at the slot edge where coil enters or comes out of the slot
5 In a single phase motor the centrifugal switch
A disconnects auxiliary winding of the motor
B disconnects main winding of the motor
C reconnects the main winding the motor
D reconnects the auxiliary winding of the motor

Answer: disconnects auxiliary winding of the motor
6 The value of starting capacitor of a fractional horse power motor will be
A 100 uF
B 200 uF
C 300 uF
D 400 uF

Answer: 300 uF
7 If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?
A Universal motor
B Shaded pole type motor
C Capacitor start motor
D Capacitor start and run motor

Answer: Universal motor
8 A centrifugal switch is used to dis- connect ‘starting winding when motor has
A run for about 1 minute
B run for about 5 minutes
C picked up about 50 to 70 per cent of rated speed
D picked up about 10 to 25 per cent of rated speed

Answer: picked up about 50 to 70 per cent of rated speed
9 In a shaded pole single-phase motor, the revolving field is produced by the use of
A inductor
B capacitor
C resistor
D shading coils

Answer: shading coils
10 In a shaded pole motor, the shading coil usually consist of
A a single turn of heavy wire which is in parallel with running winding
B a single turn of heavy copper wire which is short-circuited and carries only induced current
C a multilayer fine gauge copper wire in parallel with running winding
D none of the above

Answer: a single turn of heavy copper wire which is short-circuited and carries only induced current
11 Which of the following motor will have relatively higher power factor ?
A Capacitor run motor
B Shaded pole motor
C Capacitor start motor
D Split phase motor

Answer: Capacitor run motor
12 Which of the following motor will give relatively high starting torque ?
A Capacitor start motor
B Capacitor run motor
C Split phase motor
D Shaded pole motor

Answer: Capacitor start motor
13 The rotor developed by a single-phase motor at starting is
A more than i.he rated torque
B rated torque
C less than the rated torque
D zero

Answer: zero
14 In a split phase motor
A the starting winding is connected through a centrifugal switch
B the running winding is connected through a centrifugal switch
C both starting and running windings are connected through a centrifugal switch
D centrifugal switch is used to control supply voltage

Answer: the starting winding is connected through a centrifugal switch
15 In a capacitor start motor, the phase displacement between starting and running winding can be nearly
A 10°
B 30°
C 60°
D 90°

Answer: 90°
16 In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to
A improve power factor
B increase overload capacity
C reduce fluctuations in torque
D to improve torque

Answer: improve power factor
17 In capacitor start single-phase motors
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

Answer: current in the starting winding leads the voltage
18 If the capacitor of a single-phase motor is short-circuited
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.

Answer: the motor will not start
19 In a split phase motor, the running winding should have
A high resistance and low inductance
B low resistance and high inductance
C high resistance as well as high inductance
D low resistance as well as low inductiance

Answer: low resistance and high inductance
20 The direction of rotation of an hysteresis motor is determined by
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

Answer: position of shaded pole with respect to main pole

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