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Power Systems

Power Systems
What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

 1.20.
  0.75.
 1.05.
 0.90.

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

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Power Systems
In transmission lines distribution constants are

 inductance and capacitance
 inductance and resistance
 resistance
 both 1 and 2

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Power Systems
NTPC (National Thermal Power Cooperation) has its only thermal power generating unit in West Bengal at

 Katwa.
 Farakka.
 Durgapur.
 Bakreshwar.

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Power Systems
The inductance of single phase two wire line is given by

 4×10-7× ln(d/r') H/m
 4×10-7× ln(r'/d) H/m
 0.4×10-7× ln(d/r') H/m
 0.4×10-7× ln(r'/d) H/m

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Power Systems
Which device is used for protection of equipment from from damage caused by overload or short circuit?

 circuit breaker
 current transformer
 CVT
 lightning arrester

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