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Electrical Machines

Electrical Machines
No load test of 3-phase induction motor gives which of the following?

 constant loss
None of these
 variable loss
 both A and B

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Electrical Machines
In a three phase star - delta transformer, what is the angle difference between primary and secondary phase voltages?

 Delta side leads by 30°.
 Star side leads by 30°.
 Star side lags by -30°.
  Delta side lags by -30°.

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Electrical Machines
The speed of rotating magnetic field of 8 pole 50 Hz induction motor is

 1000 rpm
 3000 rpm
 750 rpm
 1500 rpm

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 half load
 no load
 any of the above
 full load

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Electrical Machines
A separately-excited dc motor has an armature resistance of 0.5 Ω. It runs off a 250 V dc supply Drawing an armature current of 20 A at 1500 rpm. The torque developed for an armature current Of 10 A, for the same field current, will be

 15.6 Nm
 15.28 Nm
 15.92 Nm
 16.55 Nm

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Electrical Machines
The armature resistance of the dc motor is generally of the range

 100 ohm.
  0.5 ohm.
  0.1 ohm.
 50 ohm.

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