Exam Details
| Subject | Applied Thermal Engineering | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
No. of Printed Pages: 4 IBME-053I
DIPLOMA IN MECHANICAL ENGINEERING
Term-End Examination
June, 2016
uO"l4tJ
BME-053 APPLIED THERMAL ENGINEERING
Time hours Maximum Marks: 70
Note: Answer any seven questions. All questions carry equal marks. Assume any missing data suitably. Use of scientific calculator is allowed.
1. Explain the Rankine cycle and Modified Rankine cycle with P-V diagram. 5
A gas engine working on Otto cycle has a cylinder diameter of 178 mm and stroke of 254 mm. The clearance volume is 1.5 x 10^6 mm^3. Calculate the air standard efficiency. 5
2. Explain the working of a 4-stroke petrol engine with a neat sketch. 5
Compare 2-stroke engine With 4-stroke engine. 5
3. What are gaseous fuels? List out their merits and demerits. 5
Explain the working of Battery Ignition system with a neat sketch. 5
4. Explain the working of a Spark plug with a neat sketch. 5
What is the difference between firing order and ignition timing? 5
5. Explain the working of thermostat valve in water cooling system. 5
What is the purpose of fins in air-cooled system Write the merits and demerits of an air-cooled system. 5
6. Explain briefly crank-case ventilation. 5
Name the types of oil filters and explain about cartridge oil filter. 5
7. Explain the principle of working of a Rope Brake Dynamometer. 5
A 4-cylinder 4-stroke cycle engine having cylinder diameter of 100 mm and stroke 120 mm was tested at 1600 rpm and the following readings were obtained:
Fuel consumption =0.27 litres/min
Specific gravity of fuel =0.74
B.P. =31.4 kW, Mechanical efficiency
Calorific value =44000 kJ/kg.
Determine:
bsfc imep Brake thermal efficiency. 5
8. Discuss the effect of intercooling in multi-stage compression. 5
A two-stage air compressor is to be designed to compress 6 m^3/min of free air (at ambient conditions) at 100 kPa 27°C to 900 kPa. The cylinders of the compressor are to be water jacketed and inter-cooler provided in between the two stages. The given data is
n=1.3
Volumetric efficiency of each cylinder
Temperature of air leaving intercooler 37°C
Overall compressor efficiency 85%
Determine the Piston displacement volume for each of the compressors. 5
9. What are the factors on which the complete combustion of fuel in a combustor depends 5
Classify the gas turbines and mention the principles on which they work. 5
10. Write short notes on the following: 4x2 1/2=10
Dual Combustion Cycle
Octane Number
Merits of Liquid Fuels
Ignition Advance
DIPLOMA IN MECHANICAL ENGINEERING
Term-End Examination
June, 2016
uO"l4tJ
BME-053 APPLIED THERMAL ENGINEERING
Time hours Maximum Marks: 70
Note: Answer any seven questions. All questions carry equal marks. Assume any missing data suitably. Use of scientific calculator is allowed.
1. Explain the Rankine cycle and Modified Rankine cycle with P-V diagram. 5
A gas engine working on Otto cycle has a cylinder diameter of 178 mm and stroke of 254 mm. The clearance volume is 1.5 x 10^6 mm^3. Calculate the air standard efficiency. 5
2. Explain the working of a 4-stroke petrol engine with a neat sketch. 5
Compare 2-stroke engine With 4-stroke engine. 5
3. What are gaseous fuels? List out their merits and demerits. 5
Explain the working of Battery Ignition system with a neat sketch. 5
4. Explain the working of a Spark plug with a neat sketch. 5
What is the difference between firing order and ignition timing? 5
5. Explain the working of thermostat valve in water cooling system. 5
What is the purpose of fins in air-cooled system Write the merits and demerits of an air-cooled system. 5
6. Explain briefly crank-case ventilation. 5
Name the types of oil filters and explain about cartridge oil filter. 5
7. Explain the principle of working of a Rope Brake Dynamometer. 5
A 4-cylinder 4-stroke cycle engine having cylinder diameter of 100 mm and stroke 120 mm was tested at 1600 rpm and the following readings were obtained:
Fuel consumption =0.27 litres/min
Specific gravity of fuel =0.74
B.P. =31.4 kW, Mechanical efficiency
Calorific value =44000 kJ/kg.
Determine:
bsfc imep Brake thermal efficiency. 5
8. Discuss the effect of intercooling in multi-stage compression. 5
A two-stage air compressor is to be designed to compress 6 m^3/min of free air (at ambient conditions) at 100 kPa 27°C to 900 kPa. The cylinders of the compressor are to be water jacketed and inter-cooler provided in between the two stages. The given data is
n=1.3
Volumetric efficiency of each cylinder
Temperature of air leaving intercooler 37°C
Overall compressor efficiency 85%
Determine the Piston displacement volume for each of the compressors. 5
9. What are the factors on which the complete combustion of fuel in a combustor depends 5
Classify the gas turbines and mention the principles on which they work. 5
10. Write short notes on the following: 4x2 1/2=10
Dual Combustion Cycle
Octane Number
Merits of Liquid Fuels
Ignition Advance
Other Question Papers
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Subjects
- Applied Thermal Engineering
- Automobile Engineering
- Basics of Thermal Energy
- CAD / CAM
- CNC Machanics
- Computer Integrated Manufacturing
- Engineering Materials
- Machine Design
- Manufacturing Processes-I
- Manufacturing Processes-II
- Manufacturing Processes-III
- Metrology and Instrumentation
- Power Plant Engineering
- Theory of Machine