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Electrical Machines

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

 about 115°.
 0°.
 90°.
  about 75°.

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 6 KVA
 0 KVA
 10 KVA

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Electrical Machines
In a synchronous generator, if mechanical input is increased with constant excitation, the load angle will

None of these
 either increase or decrease
 increase
 decrease

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Electrical Machines
In which of the following generators negative voltage regulation can occur?

 over compound generator
 both B and C
 series generators
 shunt generator

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Electrical Machines
A DC cumulatively compounded motor delivers rated load torque at rated speed. If the series field is short-circuited, then the armature current and speed will

 decrease and increase respectively
 increase and decrease respectively
 both decrease
 both increase

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To neutralize the distortion of main field flux due to armature reaction.
 To serve the economical aspects.
 To get a superior commutation.

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