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Electrical Machines

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?

 2000W
 1450W
 1820W
 1920W

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Electrical Machines
In a synchronous motor electromagnetic power varies

None of these
 directly as applied voltage
 inversely as applied voltage
 directly as square of applied voltage

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Electrical Machines
Winding conductors of an electrical power transformer are mainly insulated by

 cotton insulation.
 wooden insulation.
  paper insulation.
 rubber insulation.

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Electrical Machines
In a 3 - Φ IM with line frequency f1 and winding factor kw1 and kw2 for stator and rotor respectively the ratio of per phase stator winding emf E1 to per phase rotor winding emf E2 at standstill is given by

  E1 / E2 = f1kw1 / f2kw2.
  E1 / E2 = 1.
  E1 / E2 = N1 / N2.
  E1 / E2 = N1kw1 / N2kw2.

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

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

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Electrical Machines
Under commutation results in

  sparking the trailing edge of the brush.
  no sparking.
  sparking at the middle of the brush.
  sparking at the leading edge of the brush.

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