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Power Systems

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

 beryllium
All of these
 heavy water
 graphite

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Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.5
 0.75
 0.4
 0.25

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Power Systems
Maximum power transfer in a transmission line can be obtained by

 increasing voltage level
 reducing reactance
None of these
 either 1 or 2

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Power Systems
Demand factor of a plant is

 less than 1
 1
 0
 greater than 1

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

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm sinωt?

 2.63 msec
 1.47 msec
 4.68 msec
 9.68 msec

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