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Electrical Machines

Electrical Machines
Which single phase motor is used for a refrigerator?

  Universal.
  Capacitor run.
  Split phase.
  Repulsion.

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Electrical Machines
Field winding of a DC series motor is usually provided with thick wire

 in order to reduce eddy current to provide large flux.
 to provide large flux.
 to reduce the insulation of materials.
 as it carries large load current.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque and high power factor.
  high power factor only.
  none.
  high staring torque only.

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Electrical Machines
When a synchronous motor is running at synchronous speed, the damper winding produces

 no torque.
 eddy current torque.
 damping torqe.
 both 1 and 2.

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Electrical Machines
A delta/star transformer is connected in parallel to a star/delta transformer. The turn ratio former is x times latter, the x is

 √3
 1/3
 1/√3
 3

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Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
 reactance voltage produced due to communication.
  the use equalizer in lap winding.
 the use drum winding.

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