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ICE Assingment Summer 2025

The document outlines an assignment for the Mechanical Engineering Department focusing on Internal Combustion Engines, with specific tasks related to engine efficiency, performance characteristics, fuel injection systems, and thermodynamic analysis of Otto cycles. It includes detailed questions on comparing petrol and diesel engines, analyzing the effects of compression ratios, and evaluating alternative fuels and emissions. The assignment is due on August 6, 2025, and consists of multiple learning outcomes (CLOs) to be addressed.

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Rayyan Bhatti
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6 views2 pages

ICE Assingment Summer 2025

The document outlines an assignment for the Mechanical Engineering Department focusing on Internal Combustion Engines, with specific tasks related to engine efficiency, performance characteristics, fuel injection systems, and thermodynamic analysis of Otto cycles. It includes detailed questions on comparing petrol and diesel engines, analyzing the effects of compression ratios, and evaluating alternative fuels and emissions. The assignment is due on August 6, 2025, and consists of multiple learning outcomes (CLOs) to be addressed.

Uploaded by

Rayyan Bhatti
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Mechanical Engineering Department

Assignment#1 Summer Session 2025 Max Marks: 10


Internal Combustion Engines (ME-224)

Announcement Date: July 28, 2025


Submission Date: Aug 06, 2025

1(a) CLO-1
Describe how specific fuel consumption is used to evaluate engine efficiency. Summarize the method
to calculate thermal efficiency of an internal combustion engine using test data.
1(b) CLO-1
Compare the performance characteristics of a petrol engine and diesel engine under full load.
Interpret a performance curve and explain engine behavior at varying speed.
1(c) CLO-1
Describe the function of a fuel injection pump and injector nozzle in the system. Compare the
advantages of mechanical fuel injection over a carburetor in terms of fuel delivery and quality.
1(d) CLO-1
Describe the construction and working of a simple carburetor using a labeled diagram. Interpret how
the venturi effect is used in carburetor for fuel atomization and compare the effect on change of
choke and throttle valves.

2(a) CLO-2
The compression ratios of an air standard Otto cycle are 9.5 and 10.5. In both cases, before the
isentropic compression, air is 100 kPa, 35oC, and 600 cm3. The temperature at the end of the isentropic
expansion is 800 K. Using constant specific heats, ANALYZE the cycle for both compression ratios
to determine the key performance parameters including pressures, temperatures, heat input, efficiency,
and mean effective pressure. Compare the results to evaluate the impact of compression ratio on the
overall performance of the cycle.

2(b) CLO-2
A four-cylinder spark-ignition engine has a compression ratio of 8. Each cylinder has a maximum
volume of 0.6 L. Air enters compression at 98 kPa and 17oC, with a maximum cycle temperature of
1800 K. Assuming ideal Otto cycle behavior, evaluate heat supplied, efficiency, and power output
using constant specific heat at room temperature. Repeat the analysis with a maximum cycle
temperature of 2000 K and COMPARE the impact of the maximum temperature on the engine’s
performance.

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2(c) CLO-2
An ideal Otto-cycle has a compression ratio of 8. At the start of compression, the air is at 100 kPa and
17oC. During constant-volume heat addition, an energy input of either 800 kJ/kg or 1000 kJ/kg is
added. Assuming constant specific heats at room temperature categorize the cycle stages on property
diagrams and compute all relevant thermodynamic quantities including peak conditions, efficiency,
net-work, and mean effective pressure. ANALYZE the results to discuss the influence of heat addition
on cycle performance.

3 CLO-3
(a) ANALYZE the effect of four alternate fuels – LPC, natural gas, alcohol and hydrogen gas on engine
performance and emissions.
(b) DIFFERENTIATE abnormal combustion in SI and CI engines. ANALYZE the variations in CO,
HC, and Nox emissions due
(c) COMPARE the environmental effects of SI and CI engines. Focusing on pollutants like Nox, CO,
HC and particulate matter.
(d) OUTLINE the main causes of unburned hydrocarbons in SI engines.
(e) ANALYZE how the catalytic converter are useful in reducing HC, CO, and Nox emissions.
(f) OUTLINE the key components and working of Exhaust Gas Recirculation.

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