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Electrical Machines

Electrical Machines
Hopkinss test in DC motor is conducted at ?

 Low load.
 None of these.
  Full load.
 No load.

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Electrical Machines
In synchronous generator a synchronous dead load (lamp, furnaces etc) has no ____________ hence it has no natural frequency of oscillation.

  restoring torque.
 damping torque.
 mechanical rotatory system.
 synchronizing power co efficient.

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Slip.
 Running torque.
 Rotor current.
 Line voltage.

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Electrical Machines
Stray losses in transformer occurs in

  winding conductors and steel structures of transformer.
 paper insulation in transformers.
 transformer insulating oil.
 steel core.

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

 1450W
 1920W
 2000W
 1820W

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Electrical Machines
Commutator pitches of duplex and simplex lap windings are respectively

 4 and 2
 2 and 1
 4 ang 1
 2 and 2

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MORE MCQ ON Electrical Machines

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