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Power Systems

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

 3 - 6.
 6 - 8.
  16 - 24.
 12 - 14.

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Power Systems
For some given transmission line the expression for voltage regulation is given by (Vs - Vr)/Vr *100%. Hence,

 this may either be a medium line or short line
None of these
 this expression is true for any line
 this must be a short line

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Power Systems
The capacitance of an overhead transmission line increases with

 increase in mutual geometrical mean distance
 increase in height of conductors above ground
 both 1 and 2
 neither 1 nor 2

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.075 pu.
  3.000 pu.
 0.125 pu.
 0.200 pu.

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Power Systems
Length of the cable is doubled, its capacitance C will be

 unchanged.
 one-half.
 one-fourth.
 doubled.

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.8, 0.8 and 0.8 pu
 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 0.6 pu
 0.6, 0.6 and 1.2 pu

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