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Faculty of Engineering and Technology: Sessional Test 1-February 2020

This document appears to be a test for a class on internal combustion engines. It contains instructions for the test, which is worth a maximum of 30 marks and allows 1 hour and 30 minutes to complete. Question 1 is compulsory and contains 5 short questions worth 2.5 marks each. Students must then attempt any two of the three remaining questions, which are longer, multi-part questions worth 10 marks each. The questions cover topics like air standard cycles, efficiency definitions, factors that affect knocking in gasoline engines, definitions of terms like stoichiometric mixture and delay period. Later questions involve calculations related to a diesel engine's performance and fuel consumption or discussions of valve timing diagrams and combustion stages.

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Sunny Bhatia
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74 views2 pages

Faculty of Engineering and Technology: Sessional Test 1-February 2020

This document appears to be a test for a class on internal combustion engines. It contains instructions for the test, which is worth a maximum of 30 marks and allows 1 hour and 30 minutes to complete. Question 1 is compulsory and contains 5 short questions worth 2.5 marks each. Students must then attempt any two of the three remaining questions, which are longer, multi-part questions worth 10 marks each. The questions cover topics like air standard cycles, efficiency definitions, factors that affect knocking in gasoline engines, definitions of terms like stoichiometric mixture and delay period. Later questions involve calculations related to a diesel engine's performance and fuel consumption or discussions of valve timing diagrams and combustion stages.

Uploaded by

Sunny Bhatia
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as DOCX, PDF, TXT or read online on Scribd
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Student Roll no:

Manav Rachna International Institute of Research and Studies


Faculty of Engineering And Technology
Sessional Test 1-February 2020
Subject: Internal Combustion Engine & Gas Turbine Department : Automobile Engg.
Subject Code: BAU-DS-421 Max. Marks : 30
Class / Semester: 6th Time Allowed: 1:30
Note: Question 1 is compulsory. Attempt any two questions out of questions No 2 to 4. No
supplementary answer sheets will be given.

Q1. a) State the assumptions made for air standard cycles. BAU-DS-421.1
b) What is air standard efficiency & relative efficiency? BAU-DS-421.1
c) Discuss the effect of compression ratio on the knocking tendency of a SI engine. BAU-DS-421.2
d) Define stoichiometric mixture. BAU-DS-421.2
e) What is meant by delay period? BAU-DS-421.2
(4*2.5)
Q2. A four stroke, four cylinder diesel engine running at 2000 rpm develops 60kw.Brake thermal efficiency
is 30% and calorific value of fuel is 42 MJ/Kg. Engine has a bore of 120 mm and stroke of 100mm.Take
density of air 1.15kg/m3,air fuel ratio=15:1 and mechanical efficiency=0.8.calculate fuel consumption,
air consumption, indicated thermal efficiency, volumetric efficiency, brake mean effective pressure and
mean piston speed. (10) BAU-DS-421.5

Q3. Discuss the actual valve timing diagram of a four stroke petrol engine. (10) BAU-DS-421.2

Q4. Describe the phenomenon of detonation or knocking in SI Engine. On what factors does detonation
depend? (10) BAU-DS-421.4

Signature of Subject Coordinator Signature of HOD


Student Roll no:
Manav Rachna International Institute of Research and Studies
Faculty of Engineering And Technology
Sessional Test 1-February 2020
Subject: Internal Combustion Engine & Gas Turbine Department : Automobile Engg.
Subject Code: BAU-DS-421 Max. Marks : 30
Class / Semester: 6th Time Allowed: 1:30
Note: Question 1 is compulsory. Attempt any two questions out of questions No 2 to 4. No
supplementary answer sheets will be given.

Q1. a) Define Compression Ratio. BAU-DS-421.1


b) Discuss the effect of engine load on the knocking tendency of a SI engine. BAU-DS-421.1
c) Define brake power of an engine? BAU-DS-421.2
d) What do you understand by the term mean effective pressure? BAU-DS-421.2
e) Compare rich mixture and lean mixture? BAU-DS-421.2
(4*2.5)
Q2. The cubic capacity of a four stroke over square spark ignition engine is 245cc.The over square ratio is
1.1.The clearance volume is 27.2cc.Calculate the bore, stroke and compression ratio of the engine.
(10) BAU-DS-421.5
Q3 With the help of a neat sketch, discuss the actual valve timing diagram of a two stroke petrol engine.
(10) BAU-DS-421.3
Q4. Explain the stages of combustion in SI engine? (10) BAU-DS-421.2

Signature of Subject Coordinator Signature of HOD

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