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Electrical Machines

Electrical Machines
In a DC machine, the angle between the stator and rotor fields is

 dependent upon the load.
 180o.
 0o.
 90o.

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Electrical Machines
Which DC motor will have least percentage increase of input current, for the same percentage increase in the torque

 Compound Wound DC Motor
 Separately Excited DC Motor
 DC Series Motor
 DC Shunt Motor

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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.
 26.21 kW.
 24.11 kW.
 23.06 kW.

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Electrical Machines
Generators work on the principle of production of

None of these
 statically induced emf.
 dynamically induced emf.
 dynamically and statically induced emf.

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Electrical Machines
For successful parallel operation of two single phase transformers, the most essential condition is that their

 KVA ratings are equal
 polarities are properly connected
 turn- ratios are exactly equal
 percentage impedances are equal

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Electrical Machines
Two single-phase alternators operating in parallel have induced EMFs on open circuit of 230∠0° and 230∠10° volts and respective reactance of j2 Ω j3 Ω calculate the terminal voltage

 200 V.
  223.V.
 150 V.
 300 V.

ANSWER DOWNLOAD EXAMIANS APP
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