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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 tanφ = R/X
 cosφ = R/X
 cosφ = X/R

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Power Systems
For 132 kV system, the reactance and capacitance up to the location of the CB is 3 Ω and 0.015 μF respectively. The maximum value of RRRV is

 2.0 kV / μs.
 12.2 kV / μs.
 10.01 kV / μs.
  9.01 kV / μs.

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Power Systems
Rating of fuse wire is expressed in

 ÃŽÂ©.
  Ampere.
  Mho.
  Watts.

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Power Systems
For load flow studies, What are the quantities specified at load bus are

 P and V
 P and Q
 V and δ
 δ and Q

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

  high energy loss from turbine exhaust to condenser.
 low steam turbine mechanical efficiency.
 high energy loss in boiler.
 low alternative efficiency.

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Power Systems
The positive sequence reactance will be equal to negative sequence if the equipment is

  none of these.
  generator.
  motor.
  transformer and transmission lines.

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