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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?

 1450W
 1920W
 1820W
 2000W

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 electromechanical energy conversion
 generation of voltage
 commutation
 development of torque

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Electrical Machines
Voltage regulation of transformer is given by

 (E2 - V2) / E2
 (E2 - V2) / V2
 (V2 - E2) / E2
 (V2 - E2) / V2

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Electrical Machines
The armature shaft must be able to withstand

 twisting strains due to transmission of torque.
 bending moment due to weight of the armature.
All of these
 any unbalanced magnetic pull on the armature core.

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Electrical Machines
The induction motor shaft is made of

  stainless steel.
  mild steel.
  aluminium.
  cast iron.

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Electrical Machines
The frame of an induction motor is made of

  silicon steel.
  closed grained cast iron.
  stainless steel.
  aluminium.

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