Download AKTU B-Tech 5th Sem 2015-2016 I.C. Engines Compressors Eme 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) 2015-2016 I.C. Engines Compressors Eme 505 Question Paper

Printed Pages: 4 212 EME - 505
(Following Paper ID and Roll No. to be filled' 1n your
Answer Book)
Roll No.
BIECH
(SEM. V) THEORY EXAMINATION 2015-16
IC ENGINES & COMPRESSORS '
EME-505 ,
[Time:3 hours] ? [Total Marks:100]
Section-A
1. Attempt all parts. All petrts carry equal marks. Write
answer of each part in short. (10x2=20)
(a) What is surging?
w)
R)
(Q
(6)
?(0
(g)
How the effciency of an Otto cycle is increased?
What is mean effective pressure in IC Engine?
Explain the knoeking in IC Engines?
What are the Advantages and of using LPG in Car? ~
What is Scavengihg? I
Explain the meahing of ignition advance.) 2
- (1) ? T ,_.~P.T.O.

Attempt any ?ve questions from this section.
2.
(h) What is meant by supercharging?
(i) Which arethe reference fuels for knock rating of
S I engines?
(j) Why diesel Engine doesn?t have spark plug?
Section-B
(5x10=50)
What are the differences between two stroke and four
stroke engines. Draw the actual valve timing diagram for
a 4 stroke and 2 stroke S I Engine.
Discuss the effects of gasoline volatility on cold
? starting, hot starting, warm up and vapour lock. What is
performance number and diesel index?
Discuss the effects of compression ratio, engine speed
and spark advance on the knocking in S I Engine.
Explain the working principle of a magneto ignition
system with neat diagram. '
Explain the stages of combustion in S I Engines. Explain
the terms ?ame speed and ignition lag.
Explain the construction and working of simple
carburetor in a S 1 Engine. What are the A/ F requirements
of a carburetor at different operating conditions?
(2) EME-505
1
'1
;-. *?.?>?.?.,... ,1. L A
Distinguish between the ?physical ignition delay? and
"chemical ignition delay?. Discuss the effect of different
valiables onignition delay.
Explain the working of reciprocating compressor with a neat
sketch.
Section-C
Note:IAttemvpt any two questions from this section. (2x15=30)
_ 10. ' In a test of a four?cylinder, four stroke petrol engine of 75
mm bore and 100 mm stroke, the following results were
obtained at full throttle at a constantspeed and with a ?xed
setting of the fuel supply of 0.082 kg/min.
bp with all cylinder working=1 5 .24 KW
bp with cylinder number 1 c?ut?off=10.45 KW
bp with cylinder number 2 cut-off=10.38 KW
bp with cylinder number 3 cut-off=10.23 KW
bp with cylinder number 4 cut-off=10.45 KW '
Estimate the indicated power of the engine under these
conditions. If the calori?c value of the ?le] is 44 MJ/kg,
?nd the indicated thermal ef?ciency of the engine. Compare
this with the .air standard ef?ciency, the clearance volume
of one cylinder being 115 cc.
(3) P.T.O.

11.
12.
Show advantages of multistage compression with help of
PV and TS diagram. Derive optimum pressure ratio for two
stage minimum work of compression. 1
h A diesel engine has a compression ratio of20:1 with an inlet
of 95 kPa, 290 K, state 1; with volume 0.5 L. The maximum
cycle temperature is ?1800 K. Find the maximum pressure,
the net speci?c work and the thermal ef?ciency.
__x?._
(4) EME-505/4200