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Electrical Machines

Electrical Machines
Regenerative braking is not found in which motor?

 DC shunt.
 DC compound.
 Induction motor.
  DC series.

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Electrical Machines
A Shunt generator running at 1000 rpm has generated emf of 100 V. If the speed increases to 1200 rpm, the generated emf will be nearly

 120 V
 240 V
 140 V
 175 V

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Electrical Machines
The frame of an induction motor is made of

  closed grained cast iron.
  stainless steel.
  aluminium.
  silicon steel.

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Electrical Machines
A 400 V, 50 Hz, 30 Hp, three phase IM is drawing 50 A current at 0.8 p.f lagging. The stator and rotor copper losses are 1.5 KW and 900 W respectively. The friction and windage losses are 1050 W and core losses are 1200 W. The air gap power of the motor will be

 25 kW.
 23.06 kW.
 24.11 kW.
 26.21 kW.

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Electrical Machines
If a DC motor is connected across the AC supply it will

 Not run.
  Burn.
 Run at lower speed.
 Run at normal speed.

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Electrical Machines
When a short circuit test on a transformer is performed at 25 V, 50 Hz, the drawn current is I1. If the test is performed by 25 V and 25 Hz and power drawn current is I2, then

 I1 = I2
 I1 > I2
 I1 < I2
None of these

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