Single Phase Motor MCQ

31. The motor having a smooth chrome-steel cylinder as its rotor with no rotor winding is

1. Universal motor
2. Hysteresis motor
3. Repulsion motor
4. Reluctance motor

32. In capacitor start-capacitor run motor, the starting and running capacitors respectively are

1. Oil capacitor, electrolytic
2. Electrolytic, oil capacitor
3. Electrolytic, mica capacitor
4. Mica capacitor, oil capacitor

33. Fractional horse power motors have power less than

1. 1 Kilo Watt
2. 1 Mega Watt
3. 1 Watt
4. 100 Watt

34. The ratio of no load current to full load current of a single phase induction motor

1. 0.1
2. 0.2
3. 0.4
4. 0.8

35. Generally used motor in domestic food mixer is

1. Capacitor start motor
2. Shaded pole motor
3. Universal motor
4. Reluctance motor

36. Compensating winding is used in

1. Capacitor start motor
2. Shaded pole motor
3. AC Series motor
4. Capacitor run motor

37. The type of single phase induction motor having the highest power factor at full load is

1. Capacitor run type
2. Capacitor start type
3. Shaded pole type
4. Split phase type

38. A voltmeter gives 120 oscillation per minute when connected to the rotor of an induction motor. The stator frequency is 50 Hz. The slipe of the motor is

1. 2 %
2. 5 %
3. 2.5 %
4. 4 %

39. Which of the following is true about the low-frequency operation of a.c. series motor?

1. It improves its commutation property but affects adversely the p.f. and efficiency
2. It improves its commutation property, p.f. and efficiency
3. It affects adversely commutation but 1mproves p.f. and efficiency
4. None of these

40. After the starting winding is disconnected from the circuit, the motor continues to run only on the

1. squirrel-cage winding
2. running winding
3. magnetic winding
4. compensating winding