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Power Systems

Power Systems
Where air circuit breakers are used?

  Up to 11 kV.
  Up to 33 kV.
  Up to 66 kV.
  Up to 12 kV.

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Power Systems
A transmission line has self and mutual impedances are 0.8 and 0 pu respectively. Find the positive, negative and zero sequence impedances respectively?

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

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Power Systems
Advantage/s of per unit system as compare to absolute system?

All of these
 only one equation is required
 calculation time is less
 memory required is less

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Power Systems
String chart is drawn between

 nether 1 nor 2
 both 1 and 2
 T on Y-axis and S and T on on X-axis
 temperature (T) on X- axis, sag(S) and tension (T) on Y-axis

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Power Systems
Sparse matrix is matrix which contain

 more number of zeros
 less number of memory elements
 more number of memory elements
 more number of non zeros

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Power Systems
The function of moderator in a nuclear reactor is

  to slow down the neutrons.
All of these
 to increase the energy of the neutrons.
 to absorb the excess.

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