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College : Psg Polytechnic College
Degree : DME (Diploma in Mechanical Engineering)
Semester : IV
Subject : M12403/D12403 Heat Power Engineering
Document Type : Model Question Paper
Website : psgpolytech.ac.in

Download Model/ Sample Question Papers : https://www.pdfquestion.in/uploads/psgpolytech.ac.in/6205-m12403.pdf

PSG Polytech Heat Power Engineering Question Paper

PSG POLYTECHNIC COLLEGE, COIMBATORE – 641 004
DIPLOMA ODD SEMESTER EXAMINATIONS – NOV 2014
Instructions :

Related / Similar Question Paper :
PSG Polytechnic DME Design of Machine Elements Question Paper

1. Group A and Group B questions should be answered in the Main Answer book.
2. Answer any TEN questions in Group A. Each question carries 3 marks.
3. Answer ALL questions either (a) subdivision or (b) subdivision in Group B. Each question carries 14 marks.

M12403/D12403 – Heat Power Engineering
Time : 3 Hours
Max.Marks : 100

Group – A

Marks : 10 x 3 = 30
1. What is meant by adiabatic process? Sketch the process on p-V and T-S diagrams.
2. Define air cycles and air standard efficiency.
3. Write any four differences between petrol and diesel engines.

4. Distinguish between wet steam and superheated steam.
5. What are the various sources of heat losses in a boiler-
6. What is a steam condenser- How it is classified-

7. What are the uses of compressed air-
8. State the advantages of multi stage compression.
9. What are the applications of gas turbines-
10. Define the ton of refrigeration.

11. Define relative humidity.
12. Mention any four psychometric processes.
13. Write any four non-conventional sources of energy.
14. What are the advantages of solar energy-
15. Write any four comparisons between nuclear and thermal power plants.

Group – B

Marks : 5 x 14 = 70
16. a) A diesel engine has a clearance volume of 0.00025 m3 and a bore & stroke of 152.5 mm & 200 mm respectively. A charge of air at 100 kN/m2 & 20°C is taken into the cylinder & compressed adiabatically.

After combustion at constant pressure the temperature reaches to 1096°C. The expansion, which follows, is adiabatic. The cycle is closed by constant volume process finally. If = 1.4, determine.
(i) The temperature & pressure at the end of compression.
(ii) The temperature & pressure after expansion.
(iii) The ideal thermal efficiency of engine.
(OR)

b) Explain the working of four stroke petrol engine with neat sketches.
17. a) A boiler generates 750 kg of steam per hour at 11 bar absolute and with 40oC superheat and burns 100 kg of coal per hour. If the calorific value of coal is 29,300 kJ/kg, feed water temperature is 45oC and the specific heat of superheated steam is 2.09 kJ/kg K.

Calculate (i) actual evaporation, (ii) factor of evaporation, (iii) equivalent evaporation, (iv) boiler efficiency and (v) boiler power.
(OR)

b) (i) Explain the principle of operation of a reaction turbine. (7)
(ii) What is a steam condenser? Explain with a neat sketch the working of surface (7) condenser.

18. a) Explain the working of a single stage reciprocating air compressor with a neat sketch.
(OR)
b) Explain the working of constant pressure open cycle gas turbine.

19. a) Explain the working of vapour compression refrigeration system with a neat sketch.
(OR)
b) Explain the working of a central air conditioning plant with a neat sketch.

20.a) Draw the schematic layout of thermal power plant and explain.
(OR)
b) (i) Explain the nuclear reactor with a neat sketch. (8)
(ii) What are the advantages and disadvantages of wind energy power plant? (6)

Automobile Electrical Equipments Question Paper :
1. What are the purposes of battery in an automobile-
2. List out the methods used to charge the battery.
3. Write the cause and remedies of sulphation in battery.
4. What is the principle of generator-

5. Enumerate the advantages of Alternator over D.C.Generator.
6. What is meant by compensated voltage regulator-
7. Explain the need of drive mechanism in a staring motor.

8. Why starter motor need solenoid switch-
9. List the types of driving mechanism used in a starter motor.
10. Explain the function of ignition coil with sketch.

11. Describe contact breaker point mechanism.
12. List the types of spark plug and state its function.
13. Discuss the purpose of lighting system in an automobile.