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Power Systems

Power Systems
One atomic mass unit is equivalent to

 180.5 MeV.
 120.4 MeV.
 251.2 MeV.
  931.4 MeV.

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

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Power Systems
An unloaded generator with a pre-fault voltage 1 pu has the following sequence impedance: Z0 = j 0.15 pu, Z1 = Z2 = j 0.25 pu The neutral is grounded with a reactance of 0.05 pu. The fault current in pu for single line to ground fault is

 4.28 pu
 3.75 pu
 7.25 pu
 2.5 pu

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Power Systems
If we increase the spacing between the phase conductors, the value of line inductance

 remains unaffected
None of these
 increase
 decrease

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Power Systems
In a nuclear reactor, chain reactor is controlled by introducing

 iron rods.
 graphite rods.
 brass rods.
  cadmium rods.

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Power Systems
In thermal power stations, economiser will

 reduce the heat
 increase the thermal efficiency
 reduce the thermal efficiency
 both 2 and 3

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