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Power Systems

Power Systems
Condition for zero voltage regulation is

 cosφ = R/X
 tanφ = X/R
 cosφ = X/R
 tanφ = R/X

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Power Systems
Two generating stations delivering a powers of P1 = 150 MW, P2 =100 MW and the B coefficients are B11 = 0.005, B22 = 0.002, B12=B21= -0.001. Find the transmission line losses?

 105.2
 85.5
 95.5
 102.5

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Power Systems
The main objectives of electrical power transmission is/are

 both 1 and 2
 Transmission system must be more efficient with minimum line losses
 Voltage regulation of the transmission line must be zero or minimum
 nether 1 nor 2

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Power Systems
Which of the following plants has the maximum eapital cost

  Nuclear plants.
 Hydro-plants.
 Steam plants.
 Diesel plants.

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Power Systems
The ABCD constants of a 3-phase transmission line are A = D = 0.8∠1°, B = 170∠85° Ω , C = 0.002∠90.4° â„§. The sending end voltage is 400 kV. The receiving end voltage under no load condition is

 600 kV
 400 kV
 350 kV
 500 kV

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Power Systems
Earthing switch is used for

 measuring of safety voltage
All of these
 protection of equipment from ground faults
 discharging residual energies

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