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Power Systems

Power Systems
Uses of diesel power stations

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

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

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Power Systems
Which of the following is/are the desirable properties of a insulator material?

 High relative permittivity
 Low ratio of puncture strength to flash over.
 High ratio of puncture strength to flash over.
 Both 1 and 2

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Power Systems
Surge impedance loading of a line is increased by which of the following compensation methods?

 shunt reactor
 both 1 and 2
 series capacitor
 shunt capacitor

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Power Systems
The skin effect of conductor will increase when

 diameter decrease
 resistivity decrease
All of these
 frequency decrease

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Power Systems
An ACSR conductor has a diameter of 2 cm has internal inductance of 0.05 mH/Km. If this ACSR is replaced with another having a diameter of 4 cm then its internal inductance is

 0 mH/Km
 0.05 mH/Km
 0.1 mH/Km
 0.025 mH/Km

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