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Electrical Machines

Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 30 W.
 28 W.
 25 W.
 36 W.

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Electrical Machines
A DC series motor is accidentally connected to single phase ac supply voltage. The torque produced will be

 steady and unidirectional
 oscillating
None of these
 pulsating and unidirectional

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Electrical Machines
Which of the following alternators contain large number of poles?

 Turbo alternators.
 Hydro alternators.
None of these
 Aame in both alternators.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

 shunt connected.
  series connected.
  cumulatively compounded.
  deferentially compounded.

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Electrical Machines
Which type of single phase induction motor is having the highest power factor at full load ?

 Capacitor start.
  Capacitor run type.
 Split phase type.
 Shaded pole type.

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Electrical Machines
The speed of stator rotating magnetic field (RMF) with respect to rotor is

 Nr
 Ns
 S.Ns
 Zero

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