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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 (n-2)×(n-2)
 (n-1)×(n-1)
 (n-1)×(n-2)
 n×n

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Power Systems
In thermal power plants the size of coal after crushing

  300 mm.
 40 mm.
  20 - 25 mm.
 200 - 205 mm.

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Power Systems
The maximum efficiency of modern coal fired steam steam raising thermal power plants is restricted to about 0.35( a low value), mainly because of

 high energy loss in condenser
 high energy loss in boilers
 low alternator efficiency
 low steam turbine mechanical efficiency

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

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Power Systems
Which of the following relays are used in protection of medium transmission lines?

 Impedance relays
 any of the above
 Mho relays
 Admittance relays

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Power Systems
A diesel power station has fuel consumption of 0.28 Kg per kWh. The calorific value of fuel is being 10000 KCal / kg. Determine the overall efficiency

 40 %.
  30.26 %.
 40.85 %.
  30.7 %.

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