Important Note : 1. On completing your answers, compulsorily draw diagonal cross lines on the remaining blank pages. 2. Any revealing of identification, appeal to evaluator and /or equations written eg, 42+8 = 50, will be treated as malpractice.
Eighth Semester B.E. Degree Examination, June / July 2014 Electrical Power Quality Time: 3 hrs.
Max. Marks:100
Note: Answer any FIVE full questions, selecting atleast TWO questions from each part. PART – A 1
a. What is Power Quality? Explain concerns about power quality. b. Explain an impulsive and oscillatory transient. c. What is wave form distortion? List five primary types of waveform distortion.
2
a. What is Voltage sags? Explain equipment sensitivity to voltage sags. (10 Marks) b. Explain how ferro resonant transformers and on – line UPS helps in improving the system (10 Marks) performance against voltage sags.
3
a. What are sources of transient over voltages? Explain capacitor switching over voltage.
4
(08 Marks) (08 Marks) (04 Marks)
b. List the devices for over voltage protection. Explain any one.
(10 Marks) (10 Marks)
a. Explain how 3 – phase power converters introduces harmonics. b. Explain the impact of harmonic distortion on : i) Transformer
(10 Marks) (10 Marks)
ii) Motors.
PART – B 5
a. Explain with flow chart, voltage limit evaluation procedure. b. What are devices available to control harmonic distortion? Explain any one.
(10 Marks) (10 Marks)
6
a. What are typical steps in the Power Quality bench marking process? Explain. b. Explain the general procedure or approach for power quality state estimation.
(10 Marks) (10 Marks)
7
a. Explain overview of IEC standards on harmonics. b. What are Power Quality issues? Explain any one.
(10 Marks) (10 Marks)
8
a. Explain following as power quality instruments : i) Multi meters ii) Oscilloscopes. b. Explain basic design of an expert system for monitoring applications.
Eighth Semester B.E. Degree Examination, June / July 2014 Electrical ...
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