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Electrical Machines

Electrical Machines
Dynamic braking can be used for

 series motors.
All of these
 compound motors.
 shunt motors.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM is running at a full load speed of 980 rpm. If it delivers an air gap power of 98000 Watt, calculate the rotor ohmic loss?

 1800 Watt.
  1960 Watt.
 1920 Watt.
  980 Watt.

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Electrical Machines
Capacitor start capacitor run provides

  high staring torque and high power factor.
  high staring torque only.
  none.
  high power factor only.

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Electrical Machines
For higher values of armature, the speed of a DC series motor is

  Constant.
 Proportional to armature current.
 Inversely proportional to armature current.
 Proportional to the square of armature current.

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 230 V.
 200 V.
 115 V.
 460 V.

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Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 650 W
 625 W
 700 W

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MORE MCQ ON Electrical Machines

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