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POWER SYSTEMS

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
When series reactor is used in generating stations, the fault current magnitude is

 increased
 reduced
 remains unaffected
 any of the above

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Power Systems
Operator "a" rotates a vector

 clock wise direction
 anti clock wise direction
 nether 1 nor 2
 either 1 or 2

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

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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 2 pu
 2 and 5 pu
 1 and 3 pu

ANSWER DOWNLOAD EXAMIANS APP
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