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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5Ω and back back emf 200 V is

 440 A.
  40 A.
 400 A.
 44 A.

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Electrical Machines
Exciting current of an induction motor is

  higher than power transformer.
  none of these.
  equal as power transformer.
  lesser than power transformer.

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Electrical Machines
In a DC Motor 3 point starter is used to

 all of above.
 provide overload protection.
 limit the starting current to a safer value.
 provide protection against Low-Voltage.

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Electrical Machines
In electric locomotives which of the following motor are used ?

 DC compound motor.
 DC Shunt motor.
 DC series motor.
 Synchronous motor.

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Electrical Machines
If input of a transformer is square wave the output will be

  pulsed wave.
 square wave.
 sine wave.
 triangular wave.

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Electrical Machines
Which of these types of motor is used in elevators?

 DC shunt motor.
 DC compound motor.
 DC series motor.
 None of these.

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