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Power Systems

Power Systems
Condition for zero voltage regulation is

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

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Power Systems
The function of a surge tank is to

  relieve water hammer pressure in the penstock.
 supply water at constant pressure.
 produce surge in the pipeline.
 none of above.

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Power Systems
The inductance of single phase two wire line is given by

 0.4×10-7× ln(d/r') H/m
 4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(r'/d) H/m
 4×10-7× ln(d/r') H/m

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Power Systems
Area under the daily curve divided by 24 gives

 units generated
 maximum load
 maximum demand
 average load

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Power Systems
The SWR on a lossless transmission line of the characteristic impedance 100 ohm is 3. The line is the terminated by

 A resistance of 100/3 ohm.
 A resistance of j100/3 ohm.
 A resistance of j300 ohm.
 A resistance of 100 ohm.

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Power Systems
A generating station has a maximum demand of 100 MW, a load factor of 60% and a plant capacity factor of 50%. The reserve capacity of the plant is

 20 MW
 10 MW
 80 MW
 15 MW

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