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Posted By: Sree.... Member Level: Diamond Posted Date: 14 Mar 2008
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2007 Andhra Pradesh State Jawaharlal Nehru Technological University B.Tech POWER SYSTEMS-I(RR) Set No. 4 Question paper
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Code No: RR220204 Set No. 4
II B.Tech II Semester Supplimentary Examinations, Apr/May 2007
POWER SYSTEMS-I
(Electrical & Electronic Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. How do you classify Hydraulic turbines? What are their characteristics? Also
mention their applications. [16]
2. (a) What are the methods for arresting ash from flue gasses? Explain any one
method in detail. [8]
(b) Discuss the natural and forced draughts and list out the difference between
them. [8]
3. What are the main parts of a reactor? Explain the function of each component.
[16]
4. A single phase line (ABC) of length 2.0 Km having resistance and reactance (go
and return) as 0.06 and 0.1 ohms/Km. A is the feeding point, B is the mid point
of the line taking a load of 100 A at 0.8 lead and C is the far end taking a load of
100A at Upf. The voltage at the ‘C’ is 220V. Find the voltage at the sending and
the phase angle difference between the voltages of two ends. If [8+8=16]
(a) Power factors of the loads are with reference to far end voltage
(b) Power factors of the loads are with reference to the voltages at the load points.
5. (a) Explain the classification of sub-stations. [8]
(b) Explain the advantages of outdoor sub-station as compared to the indoor sub-
station [8]
6. (a) Define and explain the importance of the following terms in generations.
[4x2=8]
i. connected load,
ii. maximum demand,
iii. demand factor and
iv. average load.
(b) Discuss the various methods of determining the depreciation of the equipment.
[8]
7. (a) Explain presence of resistance, inductance and capacitance in a transmission
line and state the effects of diameter of conductor, distance between conductors
and length of line on these parameters. [8]
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Code No: RR220204 Set No. 4
(b) A 3 phase 3 wire, 110Kv transmission system consisting of 2.5cm diameter
conductors spaced 3 meters apart in a horizontal plane, supplies a balanced
load. Calculate the inductance per km of each conductor (line to neutral). [8]
8. (a) A 3 phase 50km long single circuit 66Kv, 50 Hz transposed overhead line has
horizontal spacing with 3 meters between adjacent conductors and 6 meters
between outer conductor. The conductor diameter is 2 cm. Find the capacitive
admittance and the chagrining current per phase when he line is energized at
66 KV. [8]
(b) Explain the method of images for finding the capacitance of transmission line
with ground. [8]
? ? ? ? ?
2 of 2
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