Code No: NR220204 NR

II B.Tech II Semester Supplementary Examinations, Aug/Sep 2006POWER SYSTEMS-I

(Electrical & Electronic Engineering)Time: 3 hours Max Marks: 80

Answer any FIVE QuestionsAll Questions carry equal marks

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1. Explain hydrograph and flow duration curve and mention their use. The meanmonthly discharge at a particular site is given below. [16]

Month Discharge In m3/sec Month Discharge In m3/secJanuary 200 July 1,600February 400 August 1,200March 600 September 2,000April 2,400 October 1,200May 1,200 November 800June 1,800 December 400

Draw the hydro graph, and flow-duration curve.

2. What are the systems used for firing the boilers? Explain by giving sketches. Alsomention the advantages and disadvantages of pulverizing the fuel used in boilers?

[16]

3. (a) Explain with neat diagram the concept of regenerative heating and mentionits advantages.

(b) Discuss the natural and forced draughts and list out the difference betweenthem. [8+8]

4. Explain with neat diagram the function of BWR. Mention the advantages anddisadvantages. [16]

5. Explain the following with neat diagrams:

(a) AC 3 phase 3 wire distribution system

(b) AC 3 phase 4 wire system [8+8]

6. (a) What is distribution system? How will you classify it?

(b) Explain the following: [7]

i. Feeder

ii. Distributor

iii. Service mains [3X3]

7. (a) Define and explain the importance of the following terms in generations.

i. connected load,

ii. maximum demand,

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Code No: NR220204 NR

iii. demand factor and

iv. average load. [2X4]

(b) Discuss the various methods of determining the depreciation of the equipment.[8]

8. (a) Explain the terms load factor and diversity factor. How do these factorsinfluence the cost of generation?

(b) Describe some of the important types of tariff commonly used. [8+8]

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