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Power Systems

Power Systems
Most commonly used material for insulator is

All of these
 mica
 glass
 porcelain

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Power Systems
Incremental cost of two generators Ic1 = 0.2 P1+60, Ic2 = 0.3 P2+40 and the ratings of the generator are 150 and 250 MW. Find the load sharing of each generator for a load of 200 MW?

 P1 = 60 MW, P2 = 140 MW
 P1 = 100 MW, P2 = 100 MW
 P1 = 80 MW, P2 = 120 MW
 P1 = 120 MW, P2 = 80 MW

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Power Systems
Communications lines are treated as

 short transmission lines
 medium transmission lines
 any of the above
 long transmission lines

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Power Systems
Graphite is use din nuclear plant as a / an

 fuel.
  moderator.
 electrode.
 coolant.

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Power Systems
Highest pressure generating pump inside the thermal plant is

 low pressure heater
All of these
 high pressure heater
 boiler feed pump

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 3.535 pu
 7 pu
 5.353 pu
 5 pu

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