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Power Systems

Power Systems
Specified quantities of slack bus are

 V and δ
 P and V
 P and δ
 P and Q

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Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 unity
 0.707 leading
 0.5
 0 leading

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 34.64 kV/phase
 41.075 kV/phase
 82.15 kV/phase
 17.32 kV/phase

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Power Systems
Which of the following statements is/are true? Due to corona,

 interference increases
 power loss increases
 charging current increases
All of these

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Power Systems
Critical disruptive voltage is a voltage at which

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

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Power Systems
If in a line, resistance and reactance are found to be equal and regulation is zero, then load will have

 zero power factor
 0.707 leading power factor
 unity power factor
 0.707 lagging power factor

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