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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?

 1 pu
 0.2 pu
 5 pu
 0.25 pu

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 4 MJ/MVA
 8 MJ/MVA
 16 MJ/MVA
 2 MJ/MVA

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Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

 Over current relay
 Differential relay
 Buchholz relay
 Over fluxing relay

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Power Systems
Stock bridge dampers are used to

 reduce the vibrations at the point of support
All of these
 reduce the tension
 increase the sag

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Power Systems
Surge impedance loading of a transmission line can be increased by

 addition of lumped capacitance in series
 both 1 and 3
 addition of lumped inductance in parallel
 increasing its voltage level

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

 Xs - Xm
 Xs +2 Xm
 2Xs + Xm
 Xm - Xs

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