Single Phase Induction Motors

71. 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

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

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72. The shaded pole motor is used for

1. high starting torque
2. low starting torque
3. medium starting torque
4. very high starting torque

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73. The speed control of universal motor used for sewing machines is by

1. friction
2. varying the resistance
3. tapping the field
4. centrifugal mechanism

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74. The speed of a universal motor is generally reduced by using

1. gear trains
2. V-belts
3. brakes
4. chains

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75. The speed of a universal motor is usually reduced by using

1. gearing
2. belts
3. brakes
4. chains

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76. The speed/load characteristics of a universal motor is same as that of

1. A.C. motor
2. D.C. shunt motor
3. D.C. series motor
4. none of the above

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77. The starting winding of a single-phase motor is placed in

1. armature
2. field
3. rotor
4. stator

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78. The value of starting capacitor of a fractional horse power motor will be

1. 100 uF
2. 200 uF
3. 300 uF
4. 400 uF

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79. The wattage of motor for driving domestic sewing machine will be around

1. 100 to 150 W
2. 40 to 75 W
3. 10 to 30 W
4. 5 to 10 W

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80. The wattage rating for a ceiling fan motor will be in the range

1. 200 to 250 W
2. 250 to 500 W
3. 50 to 150 W
4. 10 to 20 W

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