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Power Systems

Power Systems
Find the number of strands of ACSR conductor for 3 layer transmission line?

 1
 7
 29
 19

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Power Systems
Which of the following relays is/are unit protection relays?

 over current relays
 both 1 and 2
 Buccholz relays
 Differential relays

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Power Systems
Which of the following circuit breakers produce least arc energy?

 Air break CB.
 Plain oil CB.
 Minimum oil CB.
  Air blast CB.

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

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j1 pu
 j3 pu
 j9 pu
 j6 pu

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Power Systems
The load duration curve for a system is 8 hours 30 MW, 16 hours 25 MW and 24 hours 20 MW. The load factor will be

 0.44.
  0.83.
 1.3.
 0.25.

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