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Electrical Machines

Electrical Machines
A shunt generator is running at 1000 rpm. If flux is reduced by half, then what is the new speed?

 2000.
 500.
 0.
 1000.

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Electrical Machines
Two generators G1 and G2 are to be operated in parallel to deliver a total current of 60 A. Generator one has a terminal voltage of 280 V on no load and 240 V when supplying 40 A current. Similarly the second generator has a voltage of 300 V when on no load and 240 V when supplying of 50 A of current. The output voltage of each generator will be

 240 V.
  256.4 V.
 238.2 V.
 271.7 V.

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Electrical Machines
Secondary winding of an auto transformer is also called

  common winding.
 compensating winding.
 tertiary winding.
 damping winding.

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Electrical Machines
In a single phase transformer the magnitude of leakage reactance is twice that of resistance of both primary and secondary. With secondary short circuited, the input power factor is

 2/√5
 1/3
 1/√5
 1/√2

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

  0.23Ω.
 0.25Ω.
 1Ω.
 0.5Ω.

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Electrical Machines
In DC machines shape of net flux density is?

 flat tapped or trapezoidal
 peaky in nature
 sine wave
 saddle shape

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