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Power Systems

Power Systems
Which of following materials can be used as coolant

 CO2.
 Helium.
  Any of above.
 Heavy water.

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Power Systems
The receiving end voltage for a long line under no load condition is

 less than the sending end voltage
 any of the above
 equal to the sending end voltage
 more than the sending end voltage

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Power Systems
A hydroelectric power station is commonly found in

 desert areas.
  hilly areas.
 swamps.
 grasslands.

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Power Systems
Reflection coefficient of voltage is Rv

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

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Power Systems
An ACSR conductor has internal inductance 0.05 mH/Km for µr = 1. If this ACSR is replaced with another having µr = 2, then find the internal inductance?

 0.05 mH/Km
 0 mH/Km
 0.025 mH/Km
 0.1 mH/Km

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Power Systems
In a 220 kV system, the inductance and capacitance up to the circuit breaker location are 25 mH and 0.025 µF respectively. The value of resistor required to be connected across the breaker contacts which will give no transient oscillations, is

 1000 Ω
 500 Ω
 25 Ω
 250 Ω

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