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Power Systems

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

 inductance
 both 1 and 2
 capacitance
 conductance

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Power Systems
Positive, negative and zero sequence impedances of line are 2,2 and 5 pu respectively. Find self and mutual impedances respectively?

 3 and 1 pu
 2 and 5 pu
 1 and 3 pu
 2 and 2 pu

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Power Systems
Uses of diesel power stations

  peak load plant.
All of these
  emergency plants.
 standby plants.

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Power Systems
In thermal power plants the size of coal after crushing

 40 mm.
 200 - 205 mm.
  300 mm.
  20 - 25 mm.

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Power Systems
The most commonly used material for insulators of overhead lines is

 PVC
 glass
 mica
 porcelain

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Power Systems
A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

 -6.92%
 6.92%
 10%
 -10%

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