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Power Systems

Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 200 Ω
 400 Ω
 160 Ω
 800 Ω

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Power Systems
With reference to hydrometer station, the graphical representation of the discharge as function of time is known as

 Load duration curve.
  Hydro-graph.
 Monograph.
 Hectograph.

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Power Systems
The Y bus matrix of a 100 bus interconnected system is 90% sparse. Then find the number of non zero elements in the Y bus matrix?

 9000
 1000
 10
 90

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Power Systems
The maximum efficiency of modern coal fired steam steam raising thermal power plants is restricted to about 0.35( a low value), mainly because of

 high energy loss in condenser
 low alternator efficiency
 high energy loss in boilers
 low steam turbine mechanical efficiency

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Power Systems
Which device is used for protection of equipment from from damage caused by overload or short circuit?

 CVT
 lightning arrester
 current transformer
 circuit breaker

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Power Systems
The capacitance of an overhead transmission line increases with

 both 1 and 2
 increase in mutual geometrical mean distance
 neither 1 nor 2
 increase in height of conductors above ground

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