GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (OLD) EXAMINATION - WINTER 2018
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Subject Code:151906 Date: 30/11/2018Subject Name: Conventional Power 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 table is permitted
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Q.1 (a) Describe Rankine cycle with the help of schematic,(T-S) and (h-s) diagrams and derive the expression for its efficiency [07]
(b) A steam power plant working on Rankine cycle has range of operation from 30 bar dry saturated to 0.06 bar. Determine, (i) Cycle efficiency (ii) Work ratio (iii) Specific steam consumption [07]
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ORQ.2 (a) State the applications of gas turbine and Derive an expression for the thermal efficiency of an actual Brayton cycle. [07]
(b) The air enters the compressor of an open cycle constant pressure gas turbine at a pressure of 1 bar and temperature of 20°C. The pressure of the air after compression is 4 bar. The isentropic efficiency of compressor and turbine are 80 % and 85 % respectively. The air fuel ratio used is 90 : 1. if the flow rate of air is 3 kg per second Find, (i) Power developed (ii) Thermal efficiency of the cycle Assume, Cp = 1 kJ/kgK and y = 1.4, for air & gas and C.V.of fuel = 41800kJ/kg [07]
OR
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Q.3 (a) Write advantages and disadvantages of Hydroelectric power plant Also write classification for hydraulic turbines. [07]
(b) With the help of a neat sketch explain the working of pressurized water reactor (PWR). Also write advantages over others. [07]
OR
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Q.4 (a) Give detail classification of steam turbines. What is compounding of steam turbine? State the different methods of compounding of steam turbine? [07]
(b) State the functions of engine cooling system. With the help of neat sketch explain working of thermostat cooling system. [07]
OR
Q.5 (a) What is intercooling and regeneration? Sketch simple line diagram and T-s diagram of open cycle gas turbine with intercooling, reheating and regeneration. [07]
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(b) State the various methods of governing of steam turbines. Explain nozzle governing with neat sketch. [07]OR
Q.6 (a) Explain with neat sketch full pressure lubrication system for diesel power plant. [07]
(b) Derive an equation maximum blade efficiency for single stage Impulse turbine. And hence derive the equation for maximum power output per kg of steam. [07]
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ORQ.7 (a) Differentiate between Nuclear fission and fusion process. Explain Nuclear fission and chain reaction. [07]
(b) Describe the significance of load curves in planning and determining the size of Units in power plants. Define base load, Intermediate load and peak loads, with load curves. [07]
OR
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Q.8 (a) Draw a General layout of a thermal power plant and discuss the various circuits. Also explain the working of steam power plant. [07]
(b) With a neat diagram explain diesel power plant [07]
OR
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Q.9 Describe with the help of a neat sketch CANDU type nuclear reactor. [07]
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