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Electrical Machines

Electrical Machines
The speed of a motor falls from 1100 r.p.m at no-load to 1050 r.p.m at rated load. The speed regulation of motor is

 2.57 %.
 3.76%.
 4.76%.
 2.56 %.

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Electrical Machines
In a transformer, the frequency of a voltage at the secondary is

 any of the above.
 greater than the primary.
 equal to primary.
 less than primary.

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Electrical Machines
The back emf produced in a dc motor depends on

  P.
  P and Z.
  none of these.
  Z.

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Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 both B and C
 series motors
 shunt motors

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 ineffective.
 cross – magnetizing.
 magnetizing.
  demagnetizing.

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

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

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