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Electrical Machines

Electrical Machines
Open circuit test on transformer gives

 copper loss
 eddy current loss
 both 1and 2
 hysteresis loss

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Electrical Machines
In DC generators, the residual magnetism is of the order of

  2.5 %.
  20 %.
 10 %.
  15 %.

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Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 Partial motor.
 DC shunt motor.
 Universal motor.

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Electrical Machines
A dc motor with armature resistance of 0.5 ohms connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
  460 A.
 250 A.
  340 A.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 efficiency.
 leakage reactance.
 rating.
 percentage impedance.

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Electrical Machines
Which of the following motor is used in grinders?

  Synchronous motor.
  Capacitor start capacitor run IM.
  Capacitor start IM.
  Split phase IM.

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MORE MCQ ON Electrical Machines

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