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Power Systems

Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 three
 two
 six
 one

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Power Systems
Alternate formation and breakage of bubbles are called

All of these
  cavitations.
  surgfication.
  water hamming.

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

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

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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 sequence components of the fault current are as follows: IR1 = j1.5 pu, IR2 = -j0.5 pu, IR0 = -j1. The type of fault is

 LLL
 LG
 LL
 LLG

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Power Systems
Find the number of strands of ACSR conductor for 4 layer transmission line?

 7
 1
 37
 29

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