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Power Systems

Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 1
 0
 -2
 -1

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Power Systems
If a fault occurs on any feeder, the fault current is

  equal to unsectional bus bar.
  none of these.
  much higher than with unsectional bus bar.
  much lower than with unsectional bus bar.

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Power Systems
Direct conversion of heat energy into electrical energy is possible through

 Fuel or solar cell.
 Both A and C.
 Thermal converters.
 MHD generator.

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Power Systems
Find the characteristic impedance of a transmission line, if impedance is 16 Ω and admittance is 0.1 mâ„§?

 160 Ω
 400 Ω
 320 Ω
 200 Ω

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Power Systems
The daily energy produced in thermal power station is 720 MWh at a load factor of 0.6. What is the maximum demand of the station?

 50 MW
 720 MW
 30 MW
 72 MW

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Power Systems
The arc voltage produced in an AC circuit breaker is always

 in phase opposition with the arc current.
 leading the arc current by 90°.
 lagging the arc current by 90°.
  in phase with the arc current.

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