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Power Systems

Power Systems
Units of incremental cost is

 MWhr/Rs
 Rs/hr
 RsMW/hr
 Rs/MWhr

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Power Systems
When a transformer is loaded, the secondary terminal voltage gains. That means power factor is

 zero.
 unity.
 lagging.
  leading.

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Power Systems
To protect the power transformer ( Y-Y with neutral grounded) against fault, which type of connection do the current transformers have?

 Δ-Δ connection
 Y-Y connection
 Δ-Y connection
 Y-Δ connection

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?

 SF6 CB.
 Air blast CB.
  Vacuum CB.
 Oil CB.

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Power Systems
Which of the following represents the transmission line positive sequence reactance

 Xs +2 Xm
 2Xs + Xm
 Xs - Xm
 Xm - Xs

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm sinωt?

 4.68 msec
 2.63 msec
 1.47 msec
 9.68 msec

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