Exam Details
| Subject | I.C. Engines | |
| Paper | ||
| Exam / Course | Diploma in Mechanical Engineering (DMEVI)& B.Tech. MECHANICAL ENGINEERING 1-4 (BTMEVI) | |
| Department | School of Engineering & Technology (SOET) | |
| Organization | indira gandhi national open university | |
| Position | ||
| Exam Date | June, 2016 | |
| City, State | new delhi, |
Question Paper
1. Choose the correct answer from the given four alternatives.
In a low speed S.I. engine, the inlet-valve closes approximately
40° after BDC
30° before BDC
10° after BDC
10° before BDC
The function of a fuel injector is to
pump the fuel at high pressure
mix diesel with air
atomize the fuel
ignite the fuel
For the same value of compression ratio and heat input, the order of thermal efficiency of Otto, Diesel and Dual cycles will be as under:
<img src='./qimages/11353-1c.jpg'>
A heat engine receives 1120 kJ of heat and rejects 840 kJ of heat while operating between two temperature limits of 560 K and 280 K It indicates that the engine operates on the following cycle
Reversible cycle
Irreversible cycle
Impossible cycle
Unpredictable cycle
The thermal efficiency of an ideal Otto cycle
increases with compression ratio
increases with specific heat ratio
increases with compression ratio and specific heat ratio
increases with compression ratio but decreases with specific heat ratio
In C.I. engines, ignition delay can be reduced by
decreasing compression ratio
increase in air inlet temperature
decrease in coolant temperature
decreasing the engine speed
A machine produces 100 kJ work by consuming 100 kJ heat. This machine will be called
PMM-I
PMM-II
PMM-III
None of the above
Explain the function of a carburettor in a petrol engine with a neat sketch.
Explain the phenomenon of knock in C.I. engines and compare it with S.I. engine knock.
State the purpose of lubrication in I.C. engines.
Discuss briefly the following methods of cooling of I.C. engines:
Air cooling
Liquid cooling
Also state their relative advantages and disadvantages.
Describe with suitable sketches, the battery-ignition system used in petrol engines.
The efficiency of an Otto cycle is 50% and y is 1·5. What is the compression ratio?
What is supercharging? Enumerate the main objectives of supercharging.
What are the main pollutants emitted by petrol engines Discuss the effects of emissions on human health.
What are the main functions of the nozzle in a diesel injection system Describe the common types of nozzles used.
Compare the relative advantages and disadvantages of four-stroke and two-stroke cycle engines.
In a low speed S.I. engine, the inlet-valve closes approximately
40° after BDC
30° before BDC
10° after BDC
10° before BDC
The function of a fuel injector is to
pump the fuel at high pressure
mix diesel with air
atomize the fuel
ignite the fuel
For the same value of compression ratio and heat input, the order of thermal efficiency of Otto, Diesel and Dual cycles will be as under:
<img src='./qimages/11353-1c.jpg'>
A heat engine receives 1120 kJ of heat and rejects 840 kJ of heat while operating between two temperature limits of 560 K and 280 K It indicates that the engine operates on the following cycle
Reversible cycle
Irreversible cycle
Impossible cycle
Unpredictable cycle
The thermal efficiency of an ideal Otto cycle
increases with compression ratio
increases with specific heat ratio
increases with compression ratio and specific heat ratio
increases with compression ratio but decreases with specific heat ratio
In C.I. engines, ignition delay can be reduced by
decreasing compression ratio
increase in air inlet temperature
decrease in coolant temperature
decreasing the engine speed
A machine produces 100 kJ work by consuming 100 kJ heat. This machine will be called
PMM-I
PMM-II
PMM-III
None of the above
Explain the function of a carburettor in a petrol engine with a neat sketch.
Explain the phenomenon of knock in C.I. engines and compare it with S.I. engine knock.
State the purpose of lubrication in I.C. engines.
Discuss briefly the following methods of cooling of I.C. engines:
Air cooling
Liquid cooling
Also state their relative advantages and disadvantages.
Describe with suitable sketches, the battery-ignition system used in petrol engines.
The efficiency of an Otto cycle is 50% and y is 1·5. What is the compression ratio?
What is supercharging? Enumerate the main objectives of supercharging.
What are the main pollutants emitted by petrol engines Discuss the effects of emissions on human health.
What are the main functions of the nozzle in a diesel injection system Describe the common types of nozzles used.
Compare the relative advantages and disadvantages of four-stroke and two-stroke cycle engines.
Other Question Papers
Departments
- Centre for Corporate Education, Training & Consultancy (CCETC)
- Centre for Corporate Education, Training & Consultancy (CCETC)
- National Centre for Disability Studies (NCDS)
- School of Agriculture (SOA)
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- School of Continuing Education (SOCE)
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Subjects
- Advanced Dynamics Of Machine
- Automobile Engineering
- Combustion Engineering
- Computer Aided Manufacturing
- Computing Aided Design
- Design of Machine Elements
- Engineering Metallurgy
- Engineering Thermodynamics
- Experimental Stress Analysis
- Finite Element Analysis
- Fluid Mechanics
- Heat And Mass Transfer
- Heat Transfer
- I.C. Engines
- Industrial Engineering
- Industrial Ergonomics
- Industrial Measurement And Quality Control
- Industrial Organization And Management
- Kinematics and Dynamics of Machines
- Machine Design - I
- Machine Design-Ii
- Machine Drawing
- Machines Tools
- Maintenance Engineering
- Material Science
- Materials Handling
- Mechanical System Design
- Mechanical Vibration
- Mechanics Of Materials
- Mechatronics
- Metrology
- Metrology And Quality Control
- Non-Conventional Energy Resources
- Non-Destructive Testing
- Nuclear Power Engineering
- Optimisation Techniques In Engineering
- Optimization For Engineering Design
- Power Plant Engineering
- Power Transmitting Elements
- Product Development And Design
- Production And Operations Management
- Production Technology - Ii
- Production Technology-I
- Refrigeration And Air Conditioning
- Refrigeration System
- Robotics
- Safety Engineering
- Technical Entrepreneurship
- Thermal Engineering
- Thermal Engineering - I
- Thermofluid Engineering
- Total Quality Management (Tqm)
- Tribology
- Turbo Machines
- Unconventional Manufacturing Processes
- Welding Engg.