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Power Systems

Power Systems
The value of inductance used for compensation of arcing grounds is

 1/3ω²C
 3ω²C
 ω²C/3
 3/ω²C

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Power Systems
A generator has reactances of sub transient (X")= 0.5 pu, transient (X') = 0.8 pu and synchronous reactance (X) = 5 pu. The voltages at these reactances are 1.2 V, 1.1 V and 1 V respectively. Find the corresponding sub transient fault current in pu?

 0.2 pu
 2.4 pu
 1.375 pu
 3.975 pu

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Power Systems
Electrostatic precipitators in thermal power plants are used for

 control flow rate
 removal of ash from flue gas
 remove moisture from the cole
All of these

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Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 200 Ω
 400 Ω
 800 Ω
 160 Ω

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Power Systems
A power station has a maximum demand of 15 MW. The plant capacity is 20 MW. Find the reserve capacity of the plant?

 5 MW
 15 MW
 20 MW
 10 MW

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Power Systems
Which of the following statements is/are true? Due to corona,

 charging current increases
 interference increases
All of these
 power loss increases

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