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Electrical Machines

Electrical Machines
The back emf produced in a dc motor depends on

  P.
  Z.
  P and Z.
  none of these.

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Electrical Machines
DC motors are stopped by opening line switches and not by forcing the handle of the motor starter back to OFF position. This is due to occurance of

 Heavy sparking at the first stud of starting resistance steps.
 None of these.
 Both of above.
 Heavy sparking at brushes.

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Electrical Machines
A 240 V dc series motor takes 40 A when giving its rated output at 1500 rpm. Its resistance is 0.3 Ω. The value of resistance which must be added to obtain rated torque at 1000 rpm is

 5.7 Ω
 2.2 Ω
 1.9 Ω
 6 Ω

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Electrical Machines
If peak value of phase mmf is F max , then peak value of the rotating field caused by three phase is

 Fmax.
 3Fmax.
 (1/2)Fmax.
  (3/2)Fmax.

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Electrical Machines
High starting torque and low starting current is the advantage of

  hysteresis motor.
  slip ring induction motor.
  stepper motor.
  squirrel cage induction motor.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 S.Ns
 Nr
 Ns
 Zero

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MORE MCQ ON Electrical Machines

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