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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Hydrogen.
  Air.
  Liquid.
  Water.

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Power Systems
A 50 Hz, 17.32 kV generator is connected to a power system. The system reactance and capacitance per phase are 10 mH and 0.2 mF respectively. What is the maximum voltage across the contacts of the circuit breaker at an instant when it passes through zero?

 28.28 kV
 30.28 kV
 31.28 kV
 29.28 kV

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Power Systems
If the diameter of the conductor is increased

 the inductance is increased
 the resistance is increased
 no change in inductance and resistance
 the inductance is decreased

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Power Systems
Which of the following matrix is used for load flow studies?

 null matrix
 Unit matrix
 Y bus matrix
 Z bus matrix

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Power Systems
Which of following materials can be used as coolant

 Helium.
 Heavy water.
  Any of above.
 CO2.

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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?

 1.20.
 0.90.
  0.75.
 1.05.

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