Free Online Test Single Phase Induction Motors Quiz Questions test1

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1. In a split phase motor, the running winding should have ______.
high resistance and low inductance	low resistance and high inductance
high resistance as well as high inductance	low resistance as well as low inductiance

2. If the capacitor of a single-phase motor is short-circuited
the motor will not start	the motor will run
the motor will run in reverse direction	the motor will run in the same direction at reduced r.p.m.

3. In capacitor start single-phase motors _____.
current in the starting winding leads the voltage	current in the starting winding lags the voltage
current in the starting winding is in phase with voltage in running winding	none of the above

4. In a capacitor start and run motors the function of the running capacitor in series with the auxiliary winding is to _____.
improve power factor	increase overload capacity
reduce fluctuations in torque	to improve torque

5. In a capacitor start motor, the phase displacement between starting and running winding can be nearly ______.
10°	30°
60°	90°

6. In a split phase motor _____.
the starting winding is connected through a centrifugal switch	the running winding is connected through a centrifugal switch
both starting and running windings are connected through a centrifugal switch	centrifugal switch is used to control supply voltage

7. The rotor developed by a single-phase motor at starting is _____.
more than the rated torque	rated torque
less than the rated torque	zero

8. Which of the following motor will give relatively high starting torque ?
Capacitor start motor	Capacitor run motor
Split phase motor	Shaded pole motor

9. Which of the following motor will have relatively higher power factor ?
Capacitor run motor	Shaded pole motor
Capacitor start motor	Split phase motor

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

11. In a shaded pole single-phase motor, the revolving field is produced by the use of _____.
inductor	capacitor
resistor	shading coils

12. A centrifugal switch is used to dis- connect 'starting winding when motor has _____.
run for about 1 minute	run for about 5 minutes
picked up about 50 to 70 per cent of rated speed	picked up about 10 to 25 per cent of rated speed

13. If a particular application needs high speed and high starting torque, then which of the following motor will be preferred ?
Universal motor	Shaded pole type motor
Capacitor start motor	Capacitor start and run motor

14. The value of starting capacitor of a fractional horse power motor will be _____.
100 uF	200 uF
300 uF	400 uF

15. In repulsion motor direction of rotation of motor ______.
is opposite to that of brush shift	is the same as that of brush shift
is independent of brush shift	All of the Above

16. In a single phase motor the centrifugal switch _____.
disconnects auxiliary winding of the motor	disconnects main winding of the motor
reconnects the main winding the motor	reconnects the auxiliary winding of the motor

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 _____.
at the end connections	at the end terminals
anywhere on the winding inside a slot	at the slot edge where coil enters or comes out of the slot

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 _____.
start and then stop	start and run slowly
start and run at rated speed	not start at all

19. Which of the following motors is used in mixies ?
Repulsion motor	Reluctance motor
Hysteresis motor	Universal motor

20. Which of the following motors is inherently self starting ?
Split motor	Shaded-pole motor
Reluctance motor	None of these