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Power Systems

Power Systems
Pelton turbine is a ----------- turbine

 axial flow
 inward radial flow
 any of the above
 impulsive

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

 0.90.
  0.75.
 1.20.
 1.05.

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Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

 none of these.
 oil circuit breaker.
 air blast circuit breaker.
  SF6 breaker.

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Power Systems
A 3 - Φ, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

 3600 A.
 104.8 kA.
 1200 A.
  35 kA.

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Power Systems
Operating cost of thermal power station is

 less than that of nuclear power plant.
 is the same as that of nuclear power plant.
  less than that of diesel power plant.
 less than that of hydroelectric power plant.

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

 2Zl/(Zs + Zl)
 2Zs/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)

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