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Power Systems

Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 1
 -2
 -1
 0

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Power Systems
Where is the draft tube of a hydroelectric plant that is an airtight pipe located

 At the beginning of the penstock.
 In between the runner exhaust and the tail race.
 Near the surge tank.
  In between the penstock and runner.

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Power Systems
Deflectors are provided in

 Francis turbine.
 Kaplan turbine.
 propeller turbine.
  Pelton wheel.

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠90° Ω, C = 0.5*10^-6∠90° â„§. Find the shunt reactor required for compensating ferranti effect?

 1500 Ω
 500 Ω
 3000 Ω
 2000 Ω

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Power Systems
The function of a surge tank is to

 produce surge in the pipeline.
  relieve water hammer pressure in the penstock.
 supply water at constant pressure.
 none of above.

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Power Systems
A 1-phase transmission line has an impedance (3+4j) Ω . Find the power factor of the load for achieving maximum and zero voltage regulation?

 0.8 lag and 0.8 lead
 0.6 lag and 0.8 lead
 0.6 lag and 0.6 lead
 0.8 lag and 0.6 lead

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