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Power Systems

Power Systems
In thermal plant most of the energy is wasted in

 boiler
 condenser
 turbines
 ESP

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Power Systems
Under over excitation synchronous phase modifier works as

 any of the above
 shunt reactor
 series capacitor
 shunt capacitor

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Power Systems
A transmission line has (2 + j4)Ω impedance, 100 MVA and base voltage is 10 KV. Find the per unit impedance value of transmission line?

 (1 + j2 ) pu
 (4 + j8 ) pu
 (2 + j4 ) pu
 (0.5 + j1 ) pu

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Power Systems
Which of the following statements is/are true? By increasing of temperature,

 neither 1 nor 2
 tension decrease
 sag increase
 both 1 and 2

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Power Systems
An ACSR conductor has a diameter of 2 cm has internal inductance of 0.05 mH/Km. If this ACSR is replaced with another having a diameter of 4 cm then its internal inductance is

 0.1 mH/Km
 0.025 mH/Km
 0 mH/Km
 0.05 mH/Km

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

 Over fluxing relay
 Over current relay
 Differential relay
 Buchholz relay

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