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Power Systems

Power Systems
The most commonly used material for insulators of overhead lines is

 porcelain
 glass
 mica
 PVC

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Power Systems
A power system consists of 300 buses out of which 20 buses are generator buses, 25 buses are the ones with reactive power support buses and 15 buses are ones with fixed shunt capacitors. All the other buses are load buses. It is proposed to perform a load flow analysis for the system using Newton-Raphson Jacobian matrix is

 553×553
 555×555
 554×554
 540×540

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Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 20
 13
 10
 21

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

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Power Systems
String efficiency depends upon

 no. of SCR in the string.
 voltage rating of one SCR.
  all of these.
 voltage rating of whole string.

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Power Systems
The specific speed ( NS ) of turbine is given by

  N√( P ) / H1.25.
 none of these.
 N√( P ) / H2/3.
 P√( N ) / H3/2.

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