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Electrical Machines

Electrical Machines
Larger values of air flux density is taken while designing IM for

  none.
  larger bore diameter.
  larger output.
  both.

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Electrical Machines
In one 132 / 33 kV transformer the LV resistance is 0.02 per unit. The resistance referred to HV side is

  0.08 pu.
 0.16 pu.
  0.02 pu.
 0.01 pu.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 0°.
 about 115°.
  about 75°.
 90°.

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Electrical Machines
In a DC motor under constant terminal voltage what is the relation between torque (Te) and power (P)

 T∝ P³
 T is independent of P
 T∝ P
 T∝ P²

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Electrical Machines
In dc machines, the space waveform of the air-gap flux distribution affects

 voltage but not the torque
 torque but not the voltage
 both the torque and voltage
 neither the voltage nor the torque

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Electrical Machines
A 8 pole, 50 Hz single phase induction motor is running at 690 rpm. Its slip with respect to forward field is

 -0.08
 -1.92
 1.92
 0.08

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