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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 0
 α²
 1
 α

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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
 2 F
 0.5 F
 1 F

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Power Systems
A transmission line has self and mutual impedances of 0.8 pu and 0.2 pu. Find the positive, negative and zero sequence impedances respectively?

 0.8, 0.8 and 1.2 pu
 0.6, 0.8 and 1.2 pu
 0.6, 0.6 and 1.2 pu
 0.8, 0.6 and 1.2 pu

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Power Systems
Which of the following statements is/are true? In case of parallel transmission lines

 stability increases
 fault current increases
 both 1 and 3
 fault current reduces

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Power Systems
Which of the following is used in thermal plants

 Joule cycle
All of these
 Otto cycle
 Rankine cycle

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

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