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Power Systems

Power Systems
Attenuation occurs due to

 resistance
 inductance
 both 1 and 3
 conductance

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Power Systems
What type of back up protection is used for alternators?

  IDMT relay.
  Buchholz relay.
  Mho relay.
  Impedance relay.

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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
 25 Ω
 500 Ω
 250 Ω

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Power Systems
The line currents of 3-phase supply are: IR = 3 + j 5 A IY =2 + j 2 A IB = -2 - j 1 A The zero sequence current will be

 1 + j 2 A
 5 + j 7 A
 1 + j 4 A
 -2 - j 1 A

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Power Systems
A diesel power station has fuel consumption of 0.28 Kg per kWh. The calorific value of fuel is being 10000 KCal / kg. Determine the overall efficiency

 40 %.
  30.26 %.
  30.7 %.
 40.85 %.

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

 a minimum horse power.
  unit horse power at unit head.
 maximum horse power.
 unit horse power at all heads.

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