Download AKTU B-Tech 5th Sem 2016-2017 I.C. Engines Compressors Nme 505 Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU) B-Tech 5th Semester (Fifth Semester) 2016-2017 I.C. Engines Compressors Nme 505 Question Paper

Printed Pages: 3 NME-SOS
(Following Paper ID andRoll No. to be ?lled in your
Answer Books)
Paper ll): 20l2258 R0" N0.
B.TECH.
Regular Theory Examination (Odd Sem - V), 2016-17
I.C. Engines & Compressors .
T ime : 3 Hours Max. Marks : I 00
Section - A
Note: Attempt all parts. All parts carry equal marks.
Write answer of each part in short. (10X2=20)
1 a) De?ne compression Ratio.
b) Compare SI and CI Engine with respect to
Compression ratio & Ignition.
c) Why a n'ch mixture 13 required for maximum power?
(1) What is supercharging in a IC engine?
6) Define ignition delay.
f) What is the cause for diesel smoke?
g) List the use of LPG as SI Engine fuel.
h) What is the significance .of ?ash and ?re points of
a lubricant?
i) Differentiate between single stage and multi stage
air compressor
j) De?ne volumetric ef?ciency.
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N ME-505
Section - B
Note: Attempt any five questions from this section
(5X10=50)
2. An amount of a perfect gas has initial condition of volume
1m3, pressure 1 bar and temperature 18?C. It undergoes
ideal diesel cycle operation, the pressure after isentropic
compression being 50 bar and the volume after constant
pressure expansion being 0.1 m3. Calculated the
temperature at the major point of the cycle and evaluate
the thermal ef?ciency of diesel cycle.
3. Brie?y explain with a neat sketch the operation of a
simple ?oat type carburetor.
4. Describe high tension magneto ignition system with a
neat sketch.
5. Explain the stages of combustion in a CI Engine.
6. How are the injection system classi?ed? Describe them
brie?y.
7. A six cylinder, 4 stroke SI engine having a piston
displacement of 700 cm3 per cylinder developed 7 8 kW
at 3200 rpm and consumed 27 kg ofpetrol per hour. The
calori?c value of petrol is 44 MJ/kg. Estimate
a) Volumetric ef?ciency of the engine if the air fuel
ratio is 12 and intake air is at 0.9 bar, 32?C.
b) Brake thermal ef?ciency and
c) Brakingtorque.
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N M E-505
A single stage single acting reciprocating air compressor
has a bore of 200 mm and a stroke of 300 mm. It receives
air at 1 bar and 20?C delivered it at 5.5 bar. If the
compression follows the pv? 3 = C and clearance volume
is 5% of stroke volume, determine :
a) Mean effective pressure,
b) Power to drive the compressor, if it runs at 500 rpm.
Describe with a neat sketch the working principle of vane
blower.
Section - C
Note: Attempt any two questions from this section
10.
11.
12.
(2 X 1 5=3 0)
a) Explain the signi?cance of fuel air cycle. (5)
b) Compare the following :
i) Two stroke and four stroke engine.
ii) Otto,? diesel & dual cycle. (10)
a) Explain the stages of combustion in SI Engine.(7)
b) Sketch some important designs ofopen combustion
chamber for CI engines. (8)
Discuss Engine cooling and lubrication systems in detail
with required sketches. (20)
++++
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