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Power Systems

Power Systems
One atomic mass unit is equivalent to

  931.4 MeV.
 251.2 MeV.
 120.4 MeV.
 180.5 MeV.

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Power Systems
Bundled conductors are used for EHV transmission lines primarily for reducing the

 corona loss
 surge impedance of the line
 copper loss
 voltage drop across the line

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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

 2
 5
 6
 8

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Power Systems
Which type of connection is employed for current transformers for the protection of star- delta connected 3-phase transformer?

 star-star
 star-delta
 delta-delta
 delta-star

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Power Systems
A 100 MVA alternator operating at full load at 50 Hz. H = 4 MWsec/MVA, Td = 0.5 sec. One of the transmission line is tripped. So that output of generator is reduced to 70 MW. Find the frequency deviation during this time?

 -0.56
 0.56
 -0.92
 0.92

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xs +2 Xm
 2Xs + Xm
 Xm - Xs
 Xs - Xm

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