Most Important MCQS On Power System Part-01

MOST ASKED MCQ ON POWER SYSTEM
1. Skin effect increases



2. The lines below _____ are considered as short transmission lines



3. Voltage regulation of transmission line is greatest for which of following power factors


4. Which type of insulator is recommended for places where the direction of transmission line changes



5. A CT having a secondary current of 5 A, and an RF of 4.0 can produce a secondary current up to


Explanation: The rating factor is in a short form known as RF of a current transformer and it implies the maximum continuous current that can flow through the CT primary without exceeding the thermal capability of the CT windings.

6. String efficiency of high voltage transmission lines is around



7. A generator has an impedance value of 3 Ω. What is its base impedance value in per-unit, considering bases of 1000 MVA and 22 kV


Explanation: Base Impedance = (Base kV(L-L))^2 / Base MVA 3ɸ = 22^2 / 1000 = 0.484 Ω

8. Which of the following will result in an increase in cost of an overhead transmission line



9. Potential across the various discs of suspension string is different. This is primarily due to



10. Variable load on power system results in





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