Model Quiz Single Phase Induction Motors Questions and Answers test2

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1. In a two value capacitor motor, the capacitor used for running purposes is ______.
air capacitor	paper spaced oilfilled type
ceramic type	a.c. electrolytic type

2. Which of the following motors can be run on AC. as well as D.C. supply ?
Universal motor	Repulsion motor
Synchronous motor	Reluctance motor

3. In A.C. series motor compensating winding is employed to _____.
reduce the effects of armature reaction	increase the torque
reduce sparking at the brushes	none of the above

4. Which of the following single-phase induction motors is generally used in time phonographs ?
Resistance start	Capacitor start capacitor run
Shaded pole	Universal

5. Which of the following motors has highest starting torque ?
Repulsion motor	Shaped pole motor
Capacitor-start motor	Split-phase motor

6. The repulsion-start induction-run motor is used because of _____.
good power factor	high efficiency
minimum cost	high starting torque

7. In case of a shaded pole motor the direction of rotation of the motor is _____.
from main pole to shaded pole	from shaded pole to main pole
either of the above depending on voltage	either of the above depending on power factor

8. In case of high speed universal motor which of the following needs more attention ?
End play	Air gap
Insulation in rotor	Balancing of rotor

9. The wattage rating for a ceiling fan motor will be in the range _______.
200 to 250 W	250 to 500 W
50 to 150 W	10 to 20 W

10. The wattage of motor for driving domestic sewing machine will be around ______.
100 to 150 W	40 to 75 W
10 to 30 W	5 to 10 W

11. Which of the following single-phase motors has relatively poor starting torque ?
Universal motor	Repulsion motor
Capacitor motor	All single phase motors have zero starting torque

12. Which type of load is offered by cranes and hoists ?
Gradually varying load	Non-reversing, no-load start
Reversing, light start	Reversing, heavy start

13. The speed of a universal motor is generally reduced by using ______.
gear trains	V-belts
brakes	chains

14. Which of the following motors can be used for unity power factor ?
Capacitor run motor	Shaded pole motor
Hysteresis motor	Schrage motor

15. When a D.C. series motor is connected to A.C. supply, the power factor will be low because of ______.
high inductance of field and armature circuits	induced current in rotor due to variations of flux
fine copper wire winding	none of the above

16. The direction of rotation of universal motor can be reversed the by reversing the flow of current through
armature winding	field winding
either armature winding or field winding	none of the above

17. In which single-phase motor, the rotor has no teeth or winding ?
Split phase motor	Reluctance motor
Hysteresis motor	Universal motor

18. Which motor is normally free from mechanical and magnetic vibrations ?
Split phase motor	Universal motor
Hysteresis motor	Shaded pole motor

19. As hysteresis motors are free from mechanical and magnetic vibrations therefore these are considered as suitable for ______.
fans	blowers
sound equipment	mixer grinders

20. A reluctance motor
is self-starting	is constant speed motor
needs no D.C. excitation	all of the above