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Power Systems

Power Systems
Condition for zero voltage regulation is

 tanφ = X/R
 tanφ = R/X
 cosφ = X/R
 cosφ = R/X

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Power Systems
Differential relays does not used for which of the following faults?

 through faults
 faults within a generator
 faults within a transformer
 both 1 and 2

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Power Systems
The load current in short circuit calculations are neglected because

 short circuit currents are greatly out of phase with load currents
 both 1 and 2
 short circuit currents are much larger than load currents
 nether 1 nor 2

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Power Systems
What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

 1.05.
 1.20.
 0.90.
  0.75.

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Power Systems
In triangular configuration, inductance and capacitance values are ------ and ------ respectively

 higher, higher
 less, less
 higher, less
 less, higher

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Power Systems
The most suitable circuit breaker for short line fault without switching resistor is

  SF6 breaker.
 air blast circuit breaker.
 oil circuit breaker.
 none of these.

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