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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = R/X
 tanφ = X/R
 cosφ = X/R
 cosφ = R/X

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Power Systems
Pelton turbine is a ----------- turbine

 any of the above
 impulsive
 axial flow
 inward radial flow

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Power Systems
A buchholz relay is used for

 both 1 and 2
 nether 1 nor 2
 protection of a transformer against all internal faults
 protection of a transformer against all external faults

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Power Systems
Critical disruptive voltage is a voltage at which

 corona is visible with blue or violet colour
 corona is just initiated
 nether 1 nor 2
 both 1 and 2

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Power Systems
Fault calculations using computer are usually done by

 Z bus method
 Y bus method
 either 1 or 2
None of these

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Power Systems
What is the function of economiser in steam boilers

 cooling
 improving thermal efficiency
 collect ash particals
All of these

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