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Power Systems

Power Systems
Proximity effect is more in case of

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

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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?

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

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Power Systems
In a regenerative cycle, feed water is heated by

 all of above.
 heaters.
 exhaust gas.
  drained steam from turbine.

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Power Systems
On what factor does the performance of a circuit breaker depend?

  Breaking speed.
 Critical length of breaking.
  Both A and C.
  None of these.

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Power Systems
The rating of CB is in terms of

  VAR.
  volt - ampere.
  voltage.
  current.

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Power Systems
For complete protection of 3-phase system from the short circuit faults minimum number of relays required are

 one
 six
 three
 two

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