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Electrical Machines

Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 Zero Hz.
 50 Hz.
 25 Hz.
 100 Hz.

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Electrical Machines
The condition for maximum running torque is

 0.5 lagging
 R = S.X
 unity
 0.707 lagging
 zero

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
  Shunt.
 Compound (cummolative).
 none of these.

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Electrical Machines
Which of the following motor has negative speed regulation?

 Differential compound motor
 Cumulative compound motors
 Shunt motor
 Series motor

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Electrical Machines
Which of the following machine will have maximum efficiency?

  Electrical power transformer.
 DC motor.
 Electrical power generator.
 Induction motor.

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 20 V.
 40 V.
 0 V.
 60 V.

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