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Power Systems

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

 3 - 6.
  16 - 24.
 6 - 8.
 12 - 14.

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Power Systems
When series reactor is used in generating stations, the fault current magnitude is

 any of the above
 increased
 reduced
 remains unaffected

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Power Systems
Which of the following contributes to the Rankine cycle efficiency improvement in a thermal power plant

 Use of high pressure.
 Use of steam for heating of boiler feed water.
All of these
 Reheat of steam an intermediate stages.

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Power Systems
Main bus bar protection scheme is /are

  none of these.
  fault bus protection.
  both fault bus and differential protection.
  differential protection.

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Power Systems
For n bus power system size of Y bus matrix is

 (n-1)×(n-1)
 (n-1)×(n-2)
 n×n
 (n-2)×(n-2)

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Power Systems
For a lossy transmission line, the characteristic impedance does not depend on

 The permittivity of the dielectric separating the conductor.
 The operating frequency of the line.
 The load terminating the line.
 The conductivity of conductors.

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