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Electrical Machines

Electrical Machines
Hunting phenomenon is observed in which motor?

  Synchronous motor.
 DC motor.
 Both A and C.
 Induction motor.

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Electrical Machines
On which of the following factor/factors the speed of a DC motor depends upon?

 Armature current.
 Field flux.
 All of these.
 Applied voltage.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 series.
 cumulative compound.
 shunt.
 differential compound.

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

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Electrical Machines
In above question, find rms line voltage for delta connection?

 100 V.
 399 V.
  230.2 V.
 50 V.

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
 1000 W, 5040 W.
  3190 W, 5040 W.
 100 W, 2000 W.

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