Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 5th Semester (Fifth Semester) 2015-2016 I.C. Engines Compressors Nme 505 Question Paper
(Following Paper ID and Roll No. to be filled in your
Answer Book)
Paper ID : IJUSOS RollNo.
B.Tech.
(SEM. V) THEORY EXAMINATION, 2015-16
I. C. ENGINES & COMPRESSORS
[Time:3 hours] [Total Marks:100]
Section-A
1. Attempt all parts. All parts carry equal marks. Write
answer of each part in short. (2x 10:20)
(a) State two differences between two stroke & F our
Stroke Engines.
(b) Write the name of various fuels used in IC Engines.
(0) What is octane & Cetane Number?
((1) Mention different types of combustion chamber
used in SI engines.
(6) What is the difference in between reciprocating &
centrifugal compressor?
20400 (1) P.T.O.
(0 Write the formula for ef?ciency of Otto and
Diesel cycle.
(g) Draw P-v & T?s diagram for Air Standard Ericsson
cycle
(h) What are the major pollutants in exhaust emission?
(i) State various types of injection System.
(i) What do you mean by blow by losses?
Section-B
Attempt any ?ve questions from this section.
f0
* (5x10=50)
Compare Otto, Diesel and Dual cycles for the
a) Same compression ratio and heat input
b) Same maximum pressure and temperature
3. a) Write short notes on Surging and stalling.
b) Write short notes on diesel knock and its control.
20400 (2) NME-SOS
Following data relates to 4 cylinders, 2 stroke petrol
engine. Air/ Fuel ratio by weight 16:1. Calori?c value
of the ?le]: 45200 kj/kg, Mechanical ef?ciency =82%.
Air standard ef?ciency = 52%, Relative ef?ciency
=70%, Volumetric e?iciency = 78%, Stroke/bore ratio:
1.25, Suction condition: 1 bar, 25 ?C Speed = 2400 rpm,
Power at brakes of 72 kW. Calculate
i) Compression ratio.
ii) Brake speci?c fuel consumption m.
iii) Bore and stroke.
Derive an expression for the ef?ciency of a Dual Cycle
with P-V & T?S Diagram.
Why engine cooling is necessary. Explain the working
of thermo-syphon cooling system with neat sketch.
Prove that for two stage compressors, the work done on
one kg. of air is minimum with perfect intercooling when
the intemediate pressure is geometric mean of the
suction and delivery pressures.
Pi= 1011.
Where P5: Suction pressure.
P ?1: Delivery pressure.
What are the advantages of supercharging? Explain the
effect of altitude on power output.
20400 (3) RIO.
9. What is the main function of a spark plug? Draw a neat
sketch and explain its various parts.
Section-C
Attempt any two questions from this section. (2x15=30)
10. (a)
(b)
l]. (a)
(b)
12. (a)
(b)
20400
How are the injection system classi?ed? Describe
them brie?y. Why the air injection system is not
used now days?
Explain the stages Ofcombustion in a IC engine.
Explain the construction and working of a root
blower and axial ?ow compressor with a neat
sketch.
Sketch and explain working principle of typical
thermostat use in engine cooling system.
What do you mean by combustion? List and explain
various stages ofcombustion in IC engines.
Discuss the effect of following
i) Effect of engine speed and load on ?ame
propagation in SI engine.
ii) Effect of spark timing, engine load &
compression ratio on detonation in SI engine.
_x__
(4) NME-505
This post was last modified on 29 January 2020