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Electrical Machines

Electrical Machines
In salient pole synchronous machine, the reluctance power varies as

 sin2δ
 sinδ
 cos2δ
 cosδ

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Electrical Machines
Open circuit test on transformer gives

 eddy current loss
 hysteresis loss
 both 1and 2
 copper loss

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Electrical Machines
What is the phase difference between two windings of A.C servomotor ?

 30°.
 60°.
 90°.
 120°.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 40 V.
 90 V.
 30 V.
 60 V.

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Electrical Machines
The heat transfer by convection in a transformer least depends on

 temperature difference.
  color of the paint.
 air velocity.
 surface area.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 0.
 8 KW.
 10 KW.
  2 KW.

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MORE MCQ ON Electrical Machines

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