TOP Single Phase Induction Motors Multiple choice Questions and Answers pdf

11.    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
Ans: d

12.    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
Ans: c

13.    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
Ans: a

14.    The value of starting capacitor of a fractional horse power motor will be
(a) 100 uF
(6) 200 uF
(c) 300 uF
(d) 400 uF
 Ans: c

15.    In repulsion motor direction of rotation of motor
(a) is opposite to that of brush shift
(b) is the same as that of brush shift
(c) is independent of brush shift
Ans: b

16.    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
Ans: a

17.    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
Ans: d

18.    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
Ans: d

19.    Which of the following motors is used in mixies ?
(a) Repulsion motor
(b) Reluctance motor
(c) Hysteresis motor
(d) Universal motor
Ans: d

20.    Which of the following motors is inherently self starting ?
(a)    Split motor
(b)    Shaded-pole motor
(c)    Reluctance motor
(d)     None of these
Ans: b

Read More Questions: 
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