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Power Systems

Power Systems
In thermal power plants the size of coal after crushing

  300 mm.
 40 mm.
  20 - 25 mm.
 200 - 205 mm.

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Power Systems
Rating of fuse wire is expressed in

  Ampere.
  Watts.
 ÃŽÂ©.
  Mho.

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Power Systems
A 3-phase transmission line has its conductors at the corners of an equilateral triangle with side 3m. The diameter of each conductor is 1.63 cm. The inductance of the line per phase per km is

 1.043 mH
 1.182 mH
 1.093 mH
 1.232 mH

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Power Systems
A 50 Hz, 17.32 kV generator is connected to a power system. The system reactance and capacitance per phase are 10 mH and 0.2 mF respectively. What is the maximum voltage across the contacts of the circuit breaker at an instant when it passes through zero?

 31.28 kV
 28.28 kV
 29.28 kV
 30.28 kV

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

 two
 six
 three
 one

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Power Systems
The area under a flow duration curve represents

  total quantity of run-off during that period.
 total power available.
 total of units of energy available.
 maximum rate of run-off during the period.

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