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Power Systems

Power Systems
Phase shift occurs due to which of the following components?

 capacitance
 inductance
 both 1 and 2
 conductance

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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?

 2 F
 4 F
 0.5 F
 1 F

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Power Systems
Proximity effect is more in case of

None of these
 over head lines
 power cables
 same in both cases

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Power Systems
A hydroelectric power station is commonly found in

 desert areas.
 swamps.
 grasslands.
  hilly areas.

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Power Systems
In an induction relay for a particular current setting the operating time 4 sec. When the time multiplier setting is 0.8 if the time multiplier setting is rest to 1 the operating time is

 10.
  un changed.
 5.
  1.

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Power Systems
If a generator of 250 MVA rating has an inertia constant of 6 MJ/MVA, its inertia constant on 100 MVA base is

 6 MJ/MVA
 2.5 MJ/MVA
 10.5 MJ/MVA
 15 MJ/MVA

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