A A5811 Pages: 2

Reg No.: Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
FIFTH SEMESTER B.TECH DEGREE EXAMINATION, APRIL 2018

Course Code: EE301
Course Name: POWER GENERATION, TRANSMISSION AND PROTECTION (EE)
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer all questions, each carries 5 marks Marks
1 Explain the significance of load factor and diversity factor. (5)
2 Derive an expression for capacitance of a single-phase transmission line. (5)
3 Compare the volume of conductor required for a two-wire ‏عل‎ system with a (5)
single phase two wire ac system.
4 Explain the different methods of grading of underground cables. (5)
5 Derive an expression for rate of rise of restriking voltage in circuit breakers. (5)
6 With the help of a block diagram, explain the working of a microprocessor based (5)
relay.
7 With the help of a diagram, explain the percentage differential protection used in (5)
transformers.
8 Explain the different causes of over voltages in power system. (5)
PART B

Answer any two full questions, each carries 10 marks

9 2) With the help of a block diagram, explain the working of a thermal power plant. (5)
b) A power station is to supply four regions of loads whose peak values are 10,000 (5)
kW, 5000 kW, 8000 kW and 7000 kW. The diversity factor of the load at the
station is 1.5 and the average annual load factor is 60%. Calculate the maximum
demand on the station and annual energy supplied from the station.
10 a) With the help of a block diagram, explain the working of a wind energy (5)
conversion system.
b) A three phase, 50 Hz, 3300 V, star connected induction motor develops 250818, (5)
the power factor being 0.707 lagging and the efficiency 0.86. Three capacitors in
delta are connected across the supply terminals and power factor is raised to 0.9
lagging. Calculate:
i) The kVAR rating of the capacitor bank and
ii) The capacitance of each unit.
11 a) Derive an expression for inductance of a three-phase transmission line with (5)
unsymmetrical spacing.
b) A three phase, 66 kV, 50 Hz line has a resistance of 9.6Q, inductance of 0.097H (5)
and capacitance of 0.765 uF per phase respectively. It delivers 24 MVA at 66 kV
at 0.8 power factor lagging. Find the voltage regulation and transmission
efficiency. Use nominal T method.

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