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Power Systems

Power Systems
Condition for zero voltage regulation is

 tanφ = R/X
 tanφ = X/R
 cosφ = X/R
 cosφ = R/X

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Power Systems
Sparse matrix is matrix which contain

 more number of zeros
 more number of memory elements
 less number of memory elements
 more number of non zeros

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Power Systems
By using guard ring in a transmission line, its string efficiency

None of these
 increase
 remains unaffected
 decrease

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.5 pu, Zm =0.6 pu
 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.2 pu, Zm =0.7 pu

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Power Systems
Which of the following power stations is mainly used to cover peak load on the system?

 pumped storage hydro power plant
 nuclear plant
 gas based thermal power plant
 coal based thermal power plant

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Power Systems
Uses of diesel power stations

 standby plants.
All of these
  peak load plant.
  emergency plants.

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