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Electrical Machines

Electrical Machines
For pure resistive load what is the armature reaction?

 magnetization
 demagnetization
All of these
 cross magnetization

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Electrical Machines
Conservator tank is used

 for better cooling of transformer.
 to act as an oil storage.
None of these
 to take up the expansion of oil due to temperature rise.

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Electrical Machines
Induction motors provided with open slots have

  less breakdown torque.
  higher efficiency.
  more breakdown torque.
  leading power factor.

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Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 commutation
 electromechanical energy conversion
 development of torque
 generation of voltage

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Electrical Machines
In case of a compensated DC series motor, the compensating winding is provided

 In parallel with the field winding.
 In parallel with the armature winding.
 As a separate unit.
  In series with the armature winding.

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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. Highest speed of alternator is

 500 rpm.
 3000 rpm.
 3600 rpm.
  600 rpm.

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