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Power Systems

Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 -2
 1
 -1
 0

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Power Systems
Differential relays does not used for which of the following faults?

 faults within a generator
 through faults
 faults within a transformer
 both 1 and 2

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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

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

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Power Systems
Which of following power plants normally operage at high speeds

 Petrol engine.
  Thermal.
 Hydro electric.
 Diesel engine.

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Power Systems
Calorific value of solid fuel is expressed as

  KCal / gm.
  KCal / lt.
  Cal / gm.
  Cal / lt.

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 75%
 86%%
 50%
 90%

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