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Electrical Machines

Electrical Machines
Eddy current loss will depends on

 Flux density
 Thickness
 Frequency
All of these

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Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 400 A.
 44 A.
 440 A.
  40 A.

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Electrical Machines
The armature resistance of a permanent magnet dc motor is 0.8 Ohm. At no load, the motor draws 1.5 A from a supply voltage of 25 V and runs at 1500 rpm. The efficiency of the motor while it is operating on load at 1500 rpm drawing a current of 3.5 A from the same source will be

 88.8%.
 57.1%.
 59.2%.
 48.0%.

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Electrical Machines
Silicon content in steel lamination is kept within 5% as it

 increases hysteresis loss.
All of these
 Increases cost.
 makes the material brittle.

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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.
 200 V.
  223.V.
 150 V.

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Electrical Machines
For a 3-phase, 4 pole, 50 Hz synchronous motor the frequency, pole number and the frequency are halved. The motor speed will be

 3000 rpm
 75 rpm
 375 rpm
 1500 rpm

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