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Power Systems

Power Systems
In a 4*4 Y bus matrix the number of non zero elements are 12. Find the sparsity of the system?

 1
 0.75
 0.5
 0.25

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Power Systems
A 3 - Φ, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 s. The symmetrical breaking current is

  35 kA.
 104.8 kA.
 3600 A.
 1200 A.

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Power Systems
Highest pressure generating pump inside the thermal plant is

All of these
 high pressure heater
 boiler feed pump
 low pressure heater

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Power Systems
On a power system network the load is increasing represents the value of impedance

  none of above.
  remains constant.
  decrease.
  increase.

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

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 28 Ω
 40 Ω
 33 Ω
 52 Ω

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