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Electrical Machines

Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 90°.
 60°.
 30°.
 120°.

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Electrical Machines
Transformers operating in parallel will share the load depending upon their

 rating.
 leakage reactance.
 efficiency.
 percentage impedance.

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Electrical Machines
Iron loss in a transformer mainly occurs in

 steel core in transformer.
 winding of transformer.
 iron made tank of transformer.
 transformer insulating oil.

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Electrical Machines
The rotor electromotive force of the IM is observed to make 100 complete alterations per minute, calculated slip

 0 .001 %.
 3 %.
  3.33 %.
None of these

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

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

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 1.79 Ω
 3.1 Ω
 2 .1 Ω
 1.8 9 Ω

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