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Power Systems

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

 12 - 14.
 3 - 6.
 6 - 8.
  16 - 24.

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Power Systems
A load centre is at an equidistant from the two thermal generating stations G1 and G2. The fuel cost characteristics of the generating stations are given by F1 = a + bP1 + cP²1 F2 = a + b P2 + 2cP²2 Where P1 and P2 are the generation in MW of G1 and G2, respectively. For most economic generation to meet 300 MW of load, P1 and P2 respectively, are

 175, 125
 100, 200
 200, 100
 150, 150

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Power Systems
The equation of area control error(ACE) is

 ACE = ΔPtie + b.Δf
 ACE = ΔPtie +1/ b.Δf
 ACE = ΔPtie - 1/b.Δf
 ACE = ΔPtie - b.Δf

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Power Systems
For accurate load flow calculations on large power systems, the best method is

 Decoupled method
All of these
 G-S method
 N-R method

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Power Systems
A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

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

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Power Systems
A 20 MVA generator has inertia constant of 0.5 pu. Find new value for 50 MVA base?

 0.4 pu
 0.1 pu
 0.5 pu
 0.2 pu

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