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Electrical Machines

Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 transformer.
 generator.
 choke.

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Electrical Machines
DC machine is a

 both are correct.
 none of above are correct.
 convection machine.
 conduction machine.

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Electrical Machines
For power factor improvement the synchronous motor is to be

 lightly loaded and over excited
 lightly loaded and underecited
 heavily loaded and underexcited
 heavily loaded and over excited

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Electrical Machines
Which machine is used for battery charging?

 DC series generator.
 DC shunt generator.
 None of these.
 Compounded DC generator.

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Electrical Machines
The no load current in a transformer lags the applied voltage by

 90°.
 about 115°.
 0°.
  about 75°.

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Electrical Machines
A synchronous machine has P number of poles, find the relation between electrical angular momentum (ωe) and mechanical angular momentum (ωm)?

 ωe = ωm
 ωe = P/2*ωm
 ωe = 2/P*ωm
 ωe = P*ωm

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MORE MCQ ON Electrical Machines

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