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Electrical Machines

Electrical Machines
In alternator, the rotary part is

 none of these.
 armature.
 core.
  magnetic field poles.

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Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

  Develop excessive speed and damage itself.
 Draw too much current.
 Open fuse or circuit breaker.
 Produce sparking at brushes.

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Electrical Machines
Capacitor fitted with ceiling / table fans is of the value of

 5 - 10 F.
 0.1 µF.
  1 - 2 µF.
  2 - 3 µF.

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Electrical Machines
A 230 V, 50 Hz, 4 pole single phase induction motor is rotating in the clockwise ( forward ) direction at a speed of 1425 rpm. If the rotor resistance at standstill is 7.8 Ω. Then the effective rotor resistance in the backward branch of the equivalent circuit will be

 10 Ω.
 8 Ω.
  2 Ω.
  4 Ω.

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Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Increase.
  Remain unaltered.
  Reduce.
  Oscillate around the normal speed.

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Electrical Machines
Which of the following motor is expensive for same Kw output rates?

 DC Shunt Motor
 AC single phase motor.
 Induction motor.
 Synchronous motor.

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