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Power Systems

Power Systems
Corona loss is ----------------- on hilly areas than as plain areas.

 remain same
None of these
 more
 less

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

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

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Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 0.882
 1
 1.13
 0.93

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Power Systems
In a long transmission line, if we increase the length of the line, the parameters A and B respectively

 increases and increases
 decreases and increases
 increases and decreases
 decreases and decreases

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Power Systems
Highest pressure generating pump inside the thermal plant is

 boiler feed pump
 high pressure heater
All of these
 low pressure heater

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Power Systems
Earth fault relay uses the which of the following sequence currents?

 zero sequence
 positive sequence
 any of the above
 negative sequence

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