Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line?

Power Systems
Power system network has a total power of 5000 MW at 50 Hz supplying to the different consumers. Frequency is varying at 1.5% per change of 2% load. Assume R =0.004 Hz/MW. Find the steady state frequency deviation if a sudden loss of 200 MW occur due to tripping of one of the transmission line?

0.52 Hz

0.48 Hz

50 Hz

-0.52 Hz

0.52 Hz

0.48 Hz

50 Hz

-0.52 Hz

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Power Systems
A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

14 %.

None of above

28 %.

56 %.

14 %.

None of above

28 %.

56 %.

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Power Systems
The value of off diagonal elements is

sum of admittances connected at bus i

sum of admittances connected at bus j

which is connected between bus i and bus j with negative sign

which is connected between bus i and bus j with positive sign

sum of admittances connected at bus i

sum of admittances connected at bus j

which is connected between bus i and bus j with negative sign

which is connected between bus i and bus j with positive sign

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Power Systems
A 3 - ÃŽÂ¦, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

3600 A.

1200 A.

35 kA.

104.8 kA.

3600 A.

1200 A.

35 kA.

104.8 kA.

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Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

0.001

10

1000

0.1

0.001

10

1000

0.1

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Power Systems
In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using

direct heat in the furnace.

HP steam.

LP steam.

flue gas.

direct heat in the furnace.

HP steam.

LP steam.

flue gas.

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Power Systems

Power Systems A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

Power Systems The value of off diagonal elements is

Power Systems A 3 - ÃŽÂ¦, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

Power Systems A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

Power Systems In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using

Power Systems
A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

Power Systems
The value of off diagonal elements is

Power Systems
A 3 - ÃŽÂ¦, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

Power Systems
A pin type insulator has 100 kV puncture voltage. If 10 kV flash over voltage occurred in a transmission line, then find the safety factor of insulator?

Power Systems
In a steam power plant, the feed water coming to the economizer is heated plant the feed water coming to the economizer is heated using