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Electrical Machines

Electrical Machines
In a 3-phase induction motor, torque and supply voltage are related as

 T ∝ 1/V²
 T ∝ V
 T∝ V²
 T ∝ 1/V

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

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

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Electrical Machines
The armature of DC motor is laminated

 to reduce the eddy current loss.
 to reduce the hysteresis loss.
 to reduce the mass.
 to reduce the inductor.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

 shunt motor.
 cummulative compound motor.
 AC synchronous motor.
  series motor.

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Electrical Machines
A dc shunt generator has full-load voltage regulation of 10% at rated speed of 1000 rpm. If it is now driven at 1250 rpm, then its voltage regulation at full load would

 be more than 10%
 be less than 10%
 remain unchanged
 be 12.5%

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Electrical Machines
The condition for maximum running torque is

 zero
 R = S.X
 0.5 lagging
 unity
 0.707 lagging

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MORE MCQ ON Electrical Machines

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