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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

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

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Electrical Machines
With the increases in field excitation of a DC generator, its generated emf

 increases.
  remains constant.
  increases upto a limit and then remains almost constant.
  decreases.

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Electrical Machines
Hopkinson test is conducted under which of the following condition?

 no load
 full load
 any of the above
 half load

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Electrical Machines
In Ward-Leonard system, the lower limit of the speed imposed by

 Field resistance.
 Residual magnetism of the generator.
 Armature resistance.
 None of above.

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Electrical Machines
In Ward-Leonard method of speed control, the direction of rotation of motor is reversed usually reversing the connection of the

 motor armature terminal.
 generator field terminal.
 generator armature terminal.
 motor field terminal.

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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?

 90 V.
 30 V.
 60 V.
 40 V.

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