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Power Systems

Power Systems
What is the approximate efficiency of a normal thermal power station?

 60-70%
 20-25%
 45-55%
 30-40%

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Power Systems
Non-commercial sources of energy are

  wood, animal wastes and agricultural wastes.
 solar, wind and biomass.
None of these
 fossil fuel, hydro power and nuclear power.

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Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" < X' < X
 X" > X' < X
 X" < X' > X
 X" > X' >X

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Power Systems
Which of the following will take least time in starting from cold condition to full load operation

  Hydro electric power plant.
 Thermal power plant.
 Gas turbine plant.
 Nuclear power plant.

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Power Systems
Under excited Synchronous phase modifier works as

 series capacitor
 shunt capacitor
 shunt reactor
 any of the above

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 12.5 A
 10 A
 15 A
 6.25 A

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