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Electrical Machines

Electrical Machines
The material used for commutator brushes is mostly

 copper.
 mica.
  carbon.
 cast iron.

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Electrical Machines
Unbalance 3 - Φ stator currents cause

All of these
  heating of rotor.
  vibrations.
  double frequency currents in the rotor.

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 2 .1 Ω
 3.1 Ω
 1.8 9 Ω

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Electrical Machines
Ward Leonard control provides speed control

 in one direction only.
 above rated speed.
 below rated speed.
 in both direction.

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Electrical Machines
As compared to DOL starting, a cage induction motor with star-delta starting shall have

 smoother acceleration.
 more starting time.
 more starting torque.
 reduced starting current.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.75 Hz.
  60 Hz.
  0.65 Hz.
 0.70 Hz.

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MORE MCQ ON Electrical Machines

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