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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 4
 2
 8
 5

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Power Systems
The rate of rise of restricting voltage depends upon the

  Inductance and capacitance of the system.
 Type of CB.
 Capacitance of the system.
 Inductance of the system.

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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

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

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Power Systems
The overall efficiency of a steam power plant equal to

  product of boiler efficiency, turbine efficiency and generator efficiency.
 binary vapor cycle.
 the Rankine cycle.
 regenerative cycle.

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Power Systems
Zero voltage regulation is possible only for

All of these
 lagging power factor
 unity power factor
 leading power factor

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠°90 Ω, C = 0.5*10^-6∠90° â„§. Find Charging current under no load?

 0.344∠90° A/phase
 1.144∠90° A/phase
 0.144∠90° A/phase
 0.512∠90° A/phase

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