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Electrical Machines

Electrical Machines
The emf induced in the dc generator armature winding is

None of these
 AC and DC
 AC
 DC

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  three phase winding.
  heavy copper or aluminium bars placed in rotor slots.
  single phase winding.

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Electrical Machines
The shaft torque of a dc motor is less than the electromagnetic torque because of

  eddy current losses.
  mechanical losses.
  ohmic losses.
  hysteresis losses.

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Electrical Machines
Sparkless commutation can be achieved by employing

  high resistance carbon brushes.
 compensating winding.
  inter poles.
  any one or more of the above methods.

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Electrical Machines
A DC shunt machine generates 250 V on open circuit at 1000 RPM. Armature resistance is 0.5 Ω, field resistance 250 Ω. When running as a motor takes 4 A at 250 V. Calculate the efficiency when running as a motor taking 40 A at 250 V. Armature reaction weakens the field by 4%.

 72.5%
 67.5%
 78.5%
 82.5%

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Electrical Machines
Lamination of transformer core is made of

  cast iron.
 cast steel.
 wrought iron.
  silicon steel.

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