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Electrical Machines

Electrical Machines
The emf induced in a conductor rotating in a bipolar field is

 AC.
None of these
 both of above.
 DC.

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Electrical Machines
Tap changer is generally provided in

 current transformer.
 earthing transformer.
  power transformer.
 voltage transformer.

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Electrical Machines
The type of DC motor generally used for shears and punches is

 Differential compound motor.
 Cummulative compound motor.
 Shunt motor.
 Series motor.

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Electrical Machines
A 4 pole DC shunt generator having a wave winding supplies 50 lamps, each of 60 W at 120 V. The armature and field resistance are 0.2 Ω and 60 Ω respectively. The current in each armature conductor is

  13.5 A.
 27 A.
 23 A.
 11.5 A.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

 Shunt.
  Separately excited.
  Compound.
  Series.

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Electrical Machines
What is the necessity of copper brushes in a dc motors?

  To increase the flux cutting by the rotor.
  To convert alternating supply current to direct current.
  To absorb the mechanical shocks produced during running condition.
  None of these.

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