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Ece 372: Electrical Power Systems I. Cat I Question Paper

Ece 372: Electrical Power Systems I. Cat I

Course:Bachelor Of Electrical And Computer Engineering

Institution: Moi University question papers

Exam Year:2012

ECE 372: ELECTRICAL POWER SYSTEMS I.
CAT I
TIME ALLOWED: 1 HOUR

INSTRUCTIONS TO CANDIDATES: Attempt all questions. Plagiarism will lead to automatic disqualification. Slovenly work will be penalized.

1.
i. What is skin effect? Why is it absent in the d.c system?
ii. What is the effect of load power factor on regulation and efficiency of a transmission line?
iii. Discuss the terms voltage regulation and transmission efficiency as applied to transmission line.

2. A load of 2000kW at 0.9 p.f lagging is received at the end of a 3-phase line 30 km long. The resistance and reactance of each conductor are 0.35 ohms and 0.48 ohms per km. If the receiving end line voltage is maintained at 11 kV, calculate;
i. Sending end voltage (line-to-line)
ii. Percentage regulation
iii. Transmission efficiency

3. Explain with a neat sketch:
i. On-load tap-changing transformer
ii. Auto-transformer tap-changing.

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