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Power Systems

Power Systems
Cheapest plant in operation and maintenance is

  nuclear.
  steam power.
  hydroelectric.
  diesel power.

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Power Systems
In a Gauss Seidel load flow method, the number of iterations may be reduced if the correction in voltage at each bus is multiplied by

 Acceleration factor
 Blocking factor
 Lagrange multiplier
 Gauss constant

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Power Systems
A buchholz relay is used for

 nether 1 nor 2
 both 1 and 2
 protection of a transformer against all external faults
 protection of a transformer against all internal faults

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Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Halves.
 Decrease but does not halves.
 Doubled.
  Increase but does not doubled.

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Power Systems
a 50 Hz, 3-phase synchronous generator has inductance per phase of 15 mH. The capacitance of the generator and circuit breaker is 0.002 µF. What is its natural frequency?

 290 kHz
 29 kHz
 29 MHz
 2.9 kHz

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Power Systems
Which of following materials can be used as coolant

  Any of above.
 Helium.
 Heavy water.
 CO2.

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