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Power Systems

Power Systems
The amount of ash content in Indian coal

  45 %.
 35 %.
 20 %.
  60 %.

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Power Systems
Percentage of carbon is highest in

  bituminous coal.
  coal gas.
  anthracite coal.
  lignite coal.

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Power Systems
For a 500 Hz frequency excitation, a 100 km long power line will be modelled as

 shunt capacitor
 medium transmission line
 long transmission line
 any of the above

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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?

 29.28 kV
 28.28 kV
 30.28 kV
 31.28 kV

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Power Systems
A thermal protection switch is used to provide protection against

 over voltage.
  overload.
 temperature.
 short circuit.

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Power Systems
Which of the following relays is/are unit protection relays?

 over current relays
 Buccholz relays
 Differential relays
 both 1 and 2

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