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Power Systems

Power Systems
Condition for maximum voltage regulation

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

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Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 6
 12
 5
 3

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Power Systems
Which of the following is used in thermal plants

 Joule cycle
 Rankine cycle
 Otto cycle
All of these

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Power Systems
Which one of the following relays has the capability of anticipating the possible major fault in a transformer?

 Differential relay
 Buchholz relay
 Over current relay
 Over fluxing relay

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Power Systems
Which type of connection is employed for current transformers for the protection of delta- star connected 3-phase transformer?

 star-delta
 delta-delta
 star-star
 delta-star

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Power Systems
Taking the density of water to be 1000 kg/m³, how much power would be developed by a hydro electric generator unit, assume 100% efficiency, with 1 m head and 1 m³/s discharge?

 4.45 kW
 9.81 kW
 19.60 kW
 2.90 kW

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