Download GTU B.Tech 2020 Summer 6th Sem 2161902 Internal Combustion Engines Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Summer 6th Sem 2161902 Internal Combustion Engines Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER? VI EXAMINATION ? SUMMER 2020
Subject Code: 2161902 Date:26/10/2020
Subject Name: INTERNAL COMBUSTION ENGINES
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) State the basic function of piston, piston rings and flywheel.
03

(b) Explain with a neat sketch the working of two stroke petrol
04
engine.

(c)
Explain the variation in specific heat and loss due to it in an
07
Otto cycle with the help of P-V diagram


Q.2 (a) Make comparison of SI and CI engine.
03

(b) What is scavenging? Explain uniflow scavenging
04

(c)
Write a short note on effect of time loss, heat loss and exhaust
07
loss in Petrol and Diesel engines


OR


(c) Explain construction and working of bomb calorimeter.
07
Q.3 (a)
Define: HUCR, Octane number and Cetane number.
03

(b) Write short note on adiabatic flame temperature.
04

(c)
Discuss various mixture requirement for different loads and
07
speeds


OR

Q.3 (a) List assumptions for fuel air cycle
03

(b) Write the limitations of supercharging SI and CI engines?
04

(c) Explain construction and working of simple carburetor with
07
neat sketch.
Q.4 (a) What are the needs of supercharging?
03

(b) Describe the Pintle and Pintaux nozzle with neat sketch and
04
discuss their relative merits & demerits.

(c) Make comparison of battery and magneto ignition system.
07

OR

Q.4 (a) List the desired properties of a coolant.
03

(b) Make comparison of wet and dry sump lubrication system.
04

(c)
Draw and explain various stages of combustion in C.I.
07
engine.
Q.5 (a)
Classify C.I. engine combustion chamber.
03

(b) What are the effects of knocking on engine performance?
04

(c) State and explain effect of variables on ignition delay in SI
07
engine.


OR
Q.5 (a) Write a short note on Euro norms.
03
(b) Explain William's line method to find friction power.
04
(c) Write short note on catalytic converter.
07

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