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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 36 W.
 25 W.

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Electrical Machines
In a synchronous motor torque or load angle δ ------------- with increase in load

 increases
 decreases
 remains unaffected
None of these

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC series motor.
 DC Shunt motor.
 DC compound motor.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 3600 rpm.
 500 rpm.
  600 rpm.
 3000 rpm.

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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

 300 V.
  223.V.
 200 V.
 150 V.

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Electrical Machines
A self-excited shunt generator fails to build up, because 1. the field circuit is open 2. The armature circuit is open 3. the residual magnetism is absent 4. The direction of rotation is wrong From these, the correct answer is

 1, 2 and 3
 1, 2, 3 and 4
 3 only
 1, 3

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