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Power Systems

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

 PVC
 glass
 porcelain
 mica

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Power Systems
The economics of power plant is greatly influenced by

 diversity factor
 load factor
 both 1 and 2
 nether 1 nor 2

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Power Systems
Proximity effect is more in case of

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

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 3.535 pu
 5 pu
 5.353 pu
 7 pu

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Power Systems
Advantage/s of per unit system as compare to absolute system?

 memory required is less
 calculation time is less
All of these
 only one equation is required

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Power Systems
Which of the following is used in thermal plants

 Rankine cycle
All of these
 Otto cycle
 Joule cycle

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