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Power Systems

Power Systems
The Y bus matrix of 100 bus interconnected system is 90% sparse. Hence the number of transmission lines in the system must be

 450
 900
 500
 250

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Power Systems
If the frequency is increased, then skin effect will

 increases
 any of the above
 decreases
 remains unaffected

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Power Systems
The Gauss Seidel load flow method has following disadvantages. Which of the following statement is wrong?

 A good initial guess for voltages is essential for convergence
 Choice of slack bus affects the convergence
 Slow convergence
 Unreliable convergence

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Power Systems
The function of reflector is to

 stop the chain reaction.
 none of above.
 reduce the speed of the neutrons.
  bounce back most of the neutrons that escape from the fuel core.

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Power Systems
For head and low discharge the water turbine used

  Pelton wheel.
 Francis turbine.
 propeller turbine.
 Kaplan wheel.

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Power Systems
A 200 MVA alternator operated at no load at frequency of 50 Hz, it has inertia constant of 5 MWsec/MVA and governing system has a time delay of 0.6 sec. If the load of 50 MW is suddenly applied then find the frequency deviation during this time?

 -0.85 Hz
 -0.76 Hz
 0.85 Hz
 0.76 Hz

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