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Power Systems

Power Systems
Lightning arresters are made up of which material?

 copper
 any of the above
 silver
 silicon oxide

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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

 400 kV
 600 kV
 350 kV
 500 kV

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Power Systems
A transmission line has (2 + j4)Ω impedance, 100 MVA and base voltage is 10 KV. Find the per unit impedance value of transmission line?

 (0.5 + j1 ) pu
 (4 + j8 ) pu
 (1 + j2 ) pu
 (2 + j4 ) pu

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Power Systems
In transmission lines distribution constants are

 inductance and resistance
 resistance
 both 1 and 2
 inductance and capacitance

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

 a minimum horse power.
 maximum horse power.
  unit horse power at unit head.
 unit horse power at all heads.

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 8 MJ/MVA
 16 MJ/MVA
 4 MJ/MVA
 2 MJ/MVA

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