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Power Systems

Power Systems
Graphite is use din nuclear plant as a / an

 coolant.
 electrode.
  moderator.
 fuel.

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Power Systems
The total number of strands(N) is concentrically stranded cable with total annular space filled with strands of uniform diameter is given by (if x is number of layers)

 N = 3x²-3x+1
 N = 3x²-6x+1
 N = 3x²-2x+1
 N = 3x²+3x+1

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.2 pu, Zm =0.7 pu
 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.5 pu, Zm =0.6 pu

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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
 500 kV
 400 kV
 350 kV

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is suited for capacitor bank switching

  SF6.
  oil.
  vacuum.
  air blast.

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Power Systems
The rate of rise of restricting voltage depends upon the

  Inductance and capacitance of the system.
 Type of CB.
 Inductance of the system.
 Capacitance of the system.

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