161. A single phase induction motor is running on the main winding only. The rotor impedance seen by two rotating fields are related as impedance seen by

1. 1. forward field in finite but the backward field is seen as an open circuit.

   
   
   

   2. two fields are nearly equal.

   
   
   

   3. forward field is much more than that seen by the backward field.

   
   
   

   4. forward field is much less than that seen by the backward field.

   
   
   

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   NA

   Correct Option: C

   NA

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162. Starting torque can be obtained in case of a single phase induction motor with identical main and auxiliary windings by connecting

1. 1. a capacitor across the mains

   
   
   

   2. a capacitor in series with the machine

   
   
   

   3. a capacitor in series with the auxiliary winding

   
   
   

   4. main and auxiliary windings in series

   
   
   

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   NA

   Correct Option: C

   NA

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163. The capacitor-star single-phase induction motor develop much larger starting torque in comparison with the “split-phase” motor, because use of capacitors in the auxilliary winding enables

1. 1. provision of larger number of turns in the auxilliary winding

   
   
   

   2. larger starting current to be drawn from the supply

   
   
   

   3. torque-slip characteristic in general to get a shape to give a large starting torque

   
   
   

   4. current division between main and auxilliary winding

   
   
   

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   NA

   Correct Option: C

   NA

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164. In a shaded-pole induction motor, the rotor runs from

1. 1. shaded portion to the unshaded portion of the pole while flux in the former leads that of the latter

   
   
   

   2. shaded portion to the unshaded portion of the pole while flux in the former lags that in the latter

   
   
   

   3. unshaded portion to the shaded portion while flux in the former leads that in the latter

   
   
   

   4. unshaded portion to the shaded portion while flux in the former lags that in the latter

   
   
   

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   Correct Option: C

   

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165. Which one of the following statements regarding capacitor start, capacitor run single-phase induction motor is correct?

1. 1. One of the capacitors is in the circuit during starting and both are in the circuit during running

   
   
   

   2. Both capacitors are in the circuit during starting and one of them is in the circuit during running

   
   
   

   3. Both capacitors are in the circuit during starting and running

   
   
   

   4. One of the capacitors is in the circuit during starting and other is in circuit during running

   
   
   

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   NA

   Correct Option: B

   NA

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