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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 armature current(Ia)
 flux(φ)
None of these
 both A and B

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Electrical Machines
Which of the following motor is suitable for frequent starting and stoppings?

 Capacitor start capacitor run motor
All of these
 Capacitor start motor
 Resistance split phase motor

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Frequency should be same
 Terminal voltage is same
 Speed of alternators should be same
 Both 1and 2

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Electrical Machines
Dynamic braking is employed to brake

 reversing drive
 non reversing drive
 both 1 and 2
None of these

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Electrical Machines
Ward Leonard control provides speed control

 above rated speed.
 in one direction only.
 below rated speed.
 in both direction.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

  condition of paper insulation in transformer.
 condition of lamination on CRGO steel sheet.
 condition of cork gaskets used in transformer.
 condition of oil in transformer.

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