GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (OLD) EXAMINATION - WINTER 2018
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Subject Code:151904 Date: 11/12/2018
Subject Name: Power Plant Engineering
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
- Use of Steam tables is permitted.
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Q.1 (a) Draw general layout of modern steam power plant label major components and state the function of each component. 07
(b) Explain with neat sketch construction and working of Lamont Boiler 07
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Q.2 (a) With neat sketch explain different types of super heaters. 07
(b) What are the advantages and disadvantages of Pulverized coal firing 07
OR
(b) Explain the working of electrostatic precipitator with neat sketch 07
Q.3 (a) Derive an expression for chimney height in order to obtain a draught of ‘h’ mm of water column if the boiler used ‘m’ kg of air / kg of fuel. Assume, surrounding air temperature as ‘Ta’ and flue gas temperature as ‘Tg’ in degree absolute. Also derive an expression for the condition of maximum discharge of flue gases through a chimney. 07
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(b) Differentiate between Jet and Surface condensers. 07
OR
Q.3 (a) Classify different types of cooling tower used in power plant. Explain Natural draft cooling tower also explain the reason of its hyperbolic shape 07
(b) Classify the steam condensers and describe the methods of obtaining maximum vacuum in condenser. 07
Q4 (a) Define the following terms: 07
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(1) Connected load, (ii) Maximum demand, (iii) Average demand, (iv) Load factor, (v) Diversity factor, (vi) Utilization factor, (vii) Plant capacity factor.
(b) The peak load on a power station is 30 MW. The load having maximum demands of 25 MW, 10 MW, 5 MW and 7 MW are connected to the power station. The capacity of the power station is 40 MW and annual load factor is 50 %. 07
Find 1) Average load on the power station 2) Energy Supplied per year 3) Demand Factor 4) Diversity Factor
OR
Q.4 (a) State advantages and disadvantages of nuclear power plant. 07
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(b) Describe CANDU type reactor with the help of a neat sketch. State its advantages and disadvantages. 07
Q.5 (a) State effects of different pollutants emitted from different types of power plants. 07
(b) Explain with neat sketch arrangement of a Diesel power plant explain in brief function of each system 7
OR
Q.5 (a) Explain the effects of impurities in boiler feed water 07
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(b) With neat sketch discuss : “Hot lime soda process” 07
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