Dr.A.P.J.Abdul Kalam University BE VII SEM ALL BRANCH Power Quality [EX-7103] Dec - 2020 Question Paper

Dr.A.P.J.Abdul Kalam University

Bachelor of Engineering

Seventh Semester Main Examination, Dec-2020

Power Quality [EX-7103]

Branch-EX

Time: 3:00 Hrs Max Marks 70

Note : (i) Attempt any five questions out of eight.

          (ii) All questions carry equal marks.

Q.1 (a) Define power quality. Explain the reason for increased concern in power quality.

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(b) Write short note on-general classes of power quality problem.

Q.2 (a) What are the various methods of estimating sag performance?

(b) What are the different types of transient over voltage?

Q.3 (a) What are the basic principles of over voltage protection of load equipment?

(b) What are the different ways of estimating voltages sag performance?

Q.4 (a) Explain the fundamentals of harmonics and harmonics distortion?

(b) Explain in brief harmonics sources from commercial load and from industrial loads.

Q.5 (a) Describe harmonic distortion? Explain the principles for controlling harmonics?

(b) Write short note on: filters, passive input filter?

Q.6 (a) Explain Constant frequency control and constant tolerance band control.

(b) Explain variable tolerance band control and discontinuous current control.

Q.7 (a) What is the need for overvoltage protection?

(b) What are the devices for controlling harmonic distortion? Explain the operation of any one of

them?

Q.8 Write short note on:-

(i) Monitoring sags

(ii) Voltage sags

(iii) Interruption

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