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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.
 44 A.
 400 A.

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Electrical Machines
If the field circuit of a DC shunt motor is opened

 DC Shunt Motor
 The armature current will reduce.
  The motor will attain dangerously high speed.
 The speed of motor will be reduced.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  sipper.
  thinner.
  thicker.
  rotor can not have any laminations.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 127 A.
 173 A.
  190 A.
 240 A.

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Electrical Machines
In case of IM the torque is

  directly proportional to slip2.
  inversely proportional to slip.
  inversely proportional to √slip.
  directly proportional to slip.

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Electrical Machines
If the excitation is reduced, the power factor is

None of these
 unity power factor
 lagging power factor
 leading power factor

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MORE MCQ ON Electrical Machines

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