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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 (n-1)×(n-2)
 n×n
 (n-2)×(n-2)
 (n-1)×(n-1)

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Power Systems
Which of the following materials is/are used as moderators?

 heavy water
All of these
 graphite
 beryllium

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Power Systems
Rating of fuse wire is expressed in

 ÃŽÂ©.
  Ampere.
  Watts.
  Mho.

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Power Systems
Maximum efficiency of modern coal fired steam raising thermal power plants is restricted to about 035 (a low value), mainly because of

 high energy loss in boiler.
 low alternative efficiency.
 low steam turbine mechanical efficiency.
  high energy loss from turbine exhaust to condenser.

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Power Systems
In a 400 KV network, 360 KV is recorded at a 400 KV bus. The reactive power absorbed by shunt rated for 50 MVAr, 400 KV connected at the bus is

 45 MVAr.
  40.5 MVAr.
 61.73 MVAr.
 55.56 MVAr.

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

 104.8 kA.
 3600 A.
 1200 A.
  35 kA.

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