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Power Systems

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

 ESP
 condenser
 turbines
 boiler

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Power Systems
A cable has the following characteristics, L = 0.201 µH/m and C = 196.2 pF/m. The velocity of wave propagation through cable is

 32 m/s
 0.0312 m/s
 159.24 m/µs
 159.24 m/s

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

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Power Systems
Radio interference occur in telecommunication line due to

 electro static induction
 both 1 and 2
 nether 1 nor 2
 electro magnetic induction

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

 0.8, 0.8 and 0.8 pu
 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 0.6 pu
 0.6, 0.6 and 1.2 pu

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Power Systems
The per unit value of a 2 ohm resistor at 100 MVA and 10 kV base voltage is

 4 pu
 2 pu
 0.2 pu
 0.5 pu

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