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Electrical Machines

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

 40 A.
 440 A.
 400 A.
 44 A.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor copper loss?

 40W
 80W
 100W
 60W

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Electrical Machines
A dc shunt motor has external resistance Ra and Rf in the armature and field circuits respectively. Armature current at starting can be reduced by keeping

 Rf maximum and Ra minimum
 Ra minimum and Rf minimum
 Ra maximum and Rf maximum
 Ra maximum and Rf minimum

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Electrical Machines
The power factor of squirrel cage induction motor is

 low at rated load only
 low at heavy loads only
 both A and B
 low at light loads only

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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as

 an inductor.
 A capacitor.
  None of these.
 A resistor.

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

  4 / 5.
 2 / 3.
 5 / 6.
 6 / 7.

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