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Electrical Machines

Electrical Machines
Armature resistance control method is used for the _______ ?

 both 1 and 2
None of these
 above rated speed
 below rated speed

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase in reliability
All of these
 continuity supply is maintained
 Increase efficiency under light load conditions

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque.
 Operating speed.
 Starting torque, operating speed, full load current.

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Electrical Machines
A 3 - Φ, 400 / 200 V, Y - Y connected wound rotor induction motor has 0.06 Ω rotor resistance and 0.3 Ω standstill reactance per phase. To make the starting torque equal to maximum torque of the motor the additional resistance required

 0.78 Ω.
  0.24 Ω.
 0.45 Ω.
 0.66 Ω.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  magnetising.
  none of above.
  crossmagnetising.
 demagnetising.

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Electrical Machines
The brushes of a DC machine should be placed on the

 commutator in the inter polar axis.
 armature midway between poles.
 commutator in the polar axis.
 armature in the polar axis.

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