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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 both 1 and 2.
 load angle.
 excitation.

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Electrical Machines
Two synchronous generators operating in parallel 200 MW and 400 MW respectively. The drooping characteristics of their governors are identical as 4% from no load to full load. Consider the governors operating at 50Hz on no load. What is the operating frequency, if the load is 600 MW?

 50 Hz
 48.5 Hz
 48 Hz
 45 HZ

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Electrical Machines
The output power indicated on the name plate of any motor is always the

 Gross power.
 Power drawn in KW.
 Power drawn in KVA.
 Output power at the shaft.

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Electrical Machines
Damper winding is used to

 increase the load current.
 decrease the load current.
 both 1 and 2.
 suppress the hunting.

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Electrical Machines
A 6 pole lap connected DC generator with 480 conductors has armature resistance of 0.06 Ω. If the conductors are reconnected to from a wave winding other things remaining unchanged, the value of armature resistance will be

 0.01 Ω.
 0.54 Ω.
 0.06 Ω.
  0.54 Ω.

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Electrical Machines
If Ke is eddy current constant, Kf is form factor, f is supply frequency, Bm maximum flux density in core of transformer, the expression of eddy current loss in transformer, is given by

 Kef2KfBm2.
  Kef2Kf2Bm2.
 Kef2Kf2Bm.
 KefKf2Bm2.

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