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Power Systems

Power Systems
A 10 MVA generator has reactance of 0.2 pu. Find the new reactance value for 50 MVA base?

 5 pu
 0.25 pu
 1 pu
 0.2 pu

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Power Systems
Operating time of pumped storage plant is

 very high
 low
 high
 can't say

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Power Systems
A transmission line has a surge impedance of 400 Ω for a length of the line of 200 km. If the length of line is increased to 400 km, then its surge impedance is

 800 Ω
 200 Ω
 0 Ω
 400 Ω

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Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 Rated voltage and frequency has to be supplied to the consumers
 nether 1 nor 2
 both 1 and 2

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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 500/5. The plug setting multiplier for a fault current of 5 kA is

 8
 6
 2
 5

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Power Systems
Which of the following relays is/are unit protection relays?

 Differential relays
 over current relays
 both 1 and 2
 Buccholz relays

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