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Power Systems

Power Systems
In Francis turbine runner, the number blades is usually of the order of

 3 - 6.
 12 - 14.
 6 - 8.
  16 - 24.

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Power Systems
Deaerative heating is done to

 heat the feed water.
  remove dissolved gases in water.
 heat the steam.
 remove dissolved.

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.30
 0.0030
 0.60
 0.0060

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Power Systems
A 3-phase, 110 kV coaxial XLPE insulated power cable delivering power at 50 Hz, has a capacitance of 125 nF/km. If the dielectric loss tangent of XLPE is 2*10^-4, then dielcetric power loss in this cable in W/km/phase is

 31.7
 38.6
 35.45
 23.9

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

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

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Power Systems
The inductance of single phase two wire line is given by

 4×10-7× ln(d/r') H/m
 0.4×10-7× ln(d/r') H/m
 0.4×10-7× ln(r'/d) H/m
 4×10-7× ln(r'/d) H/m

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