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Power Systems

Power Systems
In a 4*4 Y bus matrix the number of non zero elements are 12. Find the sparsity of the system?

 0.25
 1
 0.5
 0.75

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Power Systems
Operating time of pumped storage plant is

 very high
 high
 low
 can't say

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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?

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

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Power Systems
A guard ring is used in string type insulator having 3 units to improve string efficiency. Find the capacitance of metal link 2 if pin to earth capacitance of each unit is 1 F?

 4 F
 0.5 F
 1 F
 2 F

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

  unit horse power at unit head.
 maximum horse power.
 unit horse power at all heads.
 a minimum horse power.

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Power Systems
Peak load power plants is/are

 pumped storage plant
 nuclear plants
 diesel plant
 both 1 and 2

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