FirstRanker.com
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII (NEW) EXAMINATION — WINTER 2017
--- Content provided by FirstRanker.com ---
Subject Code: 2180210 Date: 15/11/2017Subject Name: Automotive and Combustion Engine Technology
Time:02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
--- Content provided by FirstRanker.com ---
Q.1 (a) What is Engine downsizing? Write down any two methods for engine 03 downsizing.
(b) Enlist strategy for emission control in gasoline and diesel fueled 04 vehicle.
(c) Explain working of Direct Injection Gasoline Engine with schematic 07 diagram.
--- Content provided by FirstRanker.com ---
Q.2 (a) Enlist various after treatment technologies for diesel and gasoline 03 vehicle.
(b) What is stratified charge operation in case of gasoline direct injection? 04
(c) Explain different types of direct injection gasoline injectors. 07
OR
(c) Explain salient feature of spray guided combustion system for 07 gasoline direct injection.
--- Content provided by FirstRanker.com ---
Q.3 (a) What is turbocharging? What is the advantage of turbocharging in SI 03 engine?
(b) Describe Thermal loading and Turbo lag in context of gasoline engine 04 with turbo charging.
(c) Explain the reasons for knocking and abnormal combustion with 07 turbocharging in SI.engine? Enlist the methods to reduce knock and abnormal combustion.of an SI engine with turbocharging.
OR
Q.3 (a) Enlist the possible measures for NOx reduction in diesel and petrol 03 vehicles.
--- Content provided by FirstRanker.com ---
(b) What is the effect of turbocharging on SI engine emission? 04
(c) Explain the advantages of combining direct injection and 07 turbocharging in SI engine.
Q.4 (a) What is auto ignition phenomenon? What is the basic difference 03 between auto ignition combustion and SI combustion?
(b) Enlist the problems associated with stratified charge lean-burn mixture 04 in a DI gasoline engine.
(c) Explain thermal management approach to achieving auto ignition 07 combustion in gasoline engine.
--- Content provided by FirstRanker.com ---
OR
Q.4 (a) What is internal exhaust gas recirculation system and external exhaust 03 gas recirculation system?
(b) Which are the modifications required to change from SI combustion to 04 auto ignition combustion?
(c) Explain the effect of fuel injection timing on auto ignition 07 combustion.
--- Content provided by FirstRanker.com ---
FirstRanker.com
Q.5 (a) Explain how gasoline direct injection helps to achieve better fuel economy and low emissions in SI engine.
(b) Explain basic principle of HCCI combustion. 04
(c) Explain stages of combustion of HCCI engine. 07
OR
--- Content provided by FirstRanker.com ---
(a) Which are the primary objectives of gasoline HCCI engine and Diesel 03 HCCI engine?
(b) Enlist the limitation of HCCI combustion. 04
(c) Differentiate homogenous combustion and diffusion combustion 07 based on any seven aspects.
--- Content provided by FirstRanker.com ---
This download link is referred from the post: GTU BE/B.Tech 2017 Winter Question Papers || Gujarat Technological University