Maharashtra State Board of Technical Education 2011-4th Sem Diploma Automobile Engineering for in Subject :-automobile engines(12097) - Question Paper
MSBTE ques. paper for Diploma in Automobile Engineering
Fourth Semester
Subject :-automobile engines(12097)
12097
3 Hours/100 Marks Seat No
Instructions : (I) All questions are compulsory.
(2) Illustrate your answers with neat sketches wherever necessary.
(3) Figures to the right indicate full marks.
(4) Assume suitable data, if necessary.
(5) Use of Non-programmable Electronic Pocket Calculator is permissible.
(6) Mobile Phone, Pager and any other Electronic Communication devices are not permissible in Examination Hall.
Marks
1. a) Attempt any six of the following : 12
i) What is scavenging ?
ii) State the function of Flywheel.
iii) Why l.C. engines can not be cooled beyond a certain temp, limit ?
iv) Define the term Brake power of an l.C. engine.
v) What is the function of injector ?
vi) Define viscosity of oil.
vii) What is the function of Throttle valve ?
viii) What is the necessity of engine lubrication ?
b) Attempt any two of the following : 8
i) Explain the working of two stroke petrol engine.
ii) What are the merits and demerits of vertical engine ?
iii) Explain working principle of carburation.
2. Attempt any four of the following : 16
a) Write the materials for manufacturing the following components with justification :
i) Cylinder block
ii) Piston
b) Enlist the engine components.
c) Write the functions of following engine components :
i) Piston Rings
ii) Connecting Rod
d) Why additives ate added to the lubricant ?
e) Draw a neat labelled sketch of Oveihead Valve Mechanism.
f) What is the necessity of engine cooling ?
3. Attempt any two of die following : 16
a) Explain working of S.U. Carburettor.
b) Explain different types of Camshaft drives.
c) Explain working of mechanical type fuel pump with sketch.
4. Attempt any four of the following : 16
a) Explain the working of Rotary Valve.
b) Explain the working of fuel injector with sketch.
c) Compare air cooling system with water cooling system.
d) Explain pump type water cooling system with simple sketch.
e) Explain with P-V diagram theoretical Otto-cycle.
Marks
5. Attempt any four of the following : 16
a) Sketch the different types of injector nozzles.
b) Define :
i) Indicated power
ii) Mechanical efficiency
c) Name any two additives to coolant with its purpose.
d) Classify the LC. engines.
e) Differentiate between SI engine and Cl engine.
f) State the applications of an I.C. engine.
6. Attempt any two of the following : 16
a) During a test on a single cylinder two stroke petrol engine, following readings were noted.
Engine is motored by an electric motor and frictional power loss recorded on Wattmeter is 1.5 kW.
Net Brake load = 210 N
Dia. of Brake wheel = 210 cm
Engine speed = 595 rpm
Fuel consumption = 2.01 kg/hr
Calorific value of fuel = 44000 kJ/kg
Find mechanical efficiency and brake thermal efficiency.
Marks
5. Attempt any four of the following : 16
a) Sketch the different types of injector nozzles.
b) Define :
i) Indicated power
ii) Mechanical efficiency
c) Name any two additives to coolant with its purpose.
d) Classify the LC. engines.
e) Differentiate between SI engine and Cl engine.
f) State the applications of an I.C. engine.
6. Attempt any two of the following : 16
a) During a test on a single cylinder two stroke petrol engine, following readings were noted.
Engine is motored by an electric motor and frictional power loss recorded on Wattmeter is 1.5 kW.
Net Brake load = 210 N
Dia. of Brake wheel = 210 cm
Engine speed = 595 rpm
Fuel consumption = 2.01 kg/hr
Calorific value of fuel = 44000 kJ/kg
Find mechanical efficiency and brake thermal efficiency.
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