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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 α²
 α
 1
 0

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Power Systems
A generator has a rating of 10 MVA, 5 kV has a reactance of 0.02 pu. Find the reactance at a new base values of 50 MVA, 10 kV?

 0.02
 0.025
 0.25
 0.05

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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

 1200 A.
  35 kA.
 3600 A.
 104.8 kA.

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Power Systems
Which of the following statements is/are true? Corona is reduced by

 decreasing the supply frequency
 increasing the distance between the conductor
 increasing the radius of the conductor
All of these

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 8.936 pu
 7.936 pu
 9.936 pu
 10.936 pu

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Power Systems
A diesel power plant is generally used as a/an

 Base load.
 Any of above.
 Standby/emergency plant.
 Peak loads.

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