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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 mechanical loss
 copper loss
 iron loss
 both A and B

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 decrease.
 be unpredictable.
 increase
 remain the same.

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Electrical Machines
When maximum starting torque is obtained, rotor power is

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Electrical Machines
The core flux in transformer depends mainly on

 supply voltage
 supply voltage and load
 supply voltage and frequency
 supply voltage, frequency and load

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  mechanical losses.
  eddy current losses.
  ohmic losses.
  hysteresis losses.

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Electrical Machines
Ratio of starting torque to full load torque is minimum in

  Series motor.
  Cumulative compound motor.
  Shunt motor.
  Differential compound motor.

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