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Electrical Machines

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

 0°.
 about 115°.
 90°.
  about 75°.

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Electrical Machines
The back emf produced in a dc motor depends on

  none of these.
  P.
  P and Z.
  Z.

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Electrical Machines
A single phase transformer has specifications as 250 KVA, 11000 V/415 V, 50 Hz. What are the values of primary and secondary currents?

 primary = 301 A, secondary = 22.7 A
 primary = 602 A, secondary = 22.7 A
 primary = 22.7 A, secondary = 602.4 A
 primary = 11.4 A, secondary = 301 A

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Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ V
 T∝ V²
 T ∝ 1/V
 T ∝ 1/V²

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  V connection.
  star connection.
  delta connection.
  zig - zag connection.

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Electrical Machines
A 4 pole, 3-phase induction motor is running at 4% slip at full load. If the speed of the motor is 720 rpm, the supply frequency is

 25 Hz
 40 HZ
 50 Hz
 60 Hz

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