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Electrical Machines

Electrical Machines
The armature reaction mmf in a DC machines has a form of

 trapezoidal.
 rectangular.
  triangular.
 sinusoidal.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms is connected directly to a 230 Volt supply. If the armature is stationary then the current flowing through armature is

 570 A.
 250 A.
 340 A.
 460 A.

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Electrical Machines
If iron loss and full load copper loss of any transformer are denoted by Pi and Pc, then the load corresponding to maximum efficiency is given by

  (Pi / Pc)0.5 × Full Load.
 (Pi / Pc) × full Load.
 (Pi / Pc)1.6 × full Load.
 (Pi / Pc)2 × full Load.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 0.95
 0.87
 0.96
 1.06

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

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

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Electrical Machines
Which slots are used in the rotor of an induction motor?

  Semi closed slots.
  Open slots.
  Closed slots.
  None of above.

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MORE MCQ ON Electrical Machines

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