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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 460 V
 200 V
 230 V
 115 V

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Electrical Machines
An induction motor having 8 poles runs at 727.5 rpm. If the supply frequency is 50Hz, the emf in the rotor will have a frequency of

 2.5Hz
 1.5Hz
 48.5Hz
 51.5Hz

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

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

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Electrical Machines
Which of the following motor has more stability

 cylindrical motor
None of these
 both motors has same stability
 salient pole motor

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

 trapezoidal.
 sinusoidal.
 rectangular.
  triangular.

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

  1 - Φ synchronous motor.
 3 - Φ induction motor.
 DC motor.
 Stepper motor.

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