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Electrical Machines

Electrical Machines
A voltmeter gives 120 oscillations per minute when connected to the rotor of an induction motor. The frequency is 50Hz. The slip of the motor is

 4%
 5%
 25%
 2%

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Electrical Machines
For a specific open-circuit voltage of a DC generator, the short-circuit electric current will be maximum when it is

  separately excited.
 differentially compounded.
  cumulatively compounded.
  shunt connected.

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Electrical Machines
A single phase, 2 KV alternator has an armature resistance of 0.8 ohms and 4.94 ohms respectively. The voltage regulation of the alternator at 100 a load 0.8 loading power factor is

 7%.
 14%.
  8.9%.
 0%.

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Electrical Machines
The field system of an alternator is usually excited

  110 / 220 V AC.
  3 - Φ, 50 Hz and 400 V.
  230 V AC.
  250 / 250 V DC.

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Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 DC.
 both of above.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  218.5 volt.
 220.4 volt.
  120 volt.
  None of these.

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