Monday, August 29, 2016
Roll no……………..
Total no. of
Questions:09]
B.Tech. (sem.-3rd)
AUTOMOTIVE MATERIALS AND METALLURGY
SUBJECT CODE: AE-207
PAPER ID:[A0705]
Instruction to
Candidates:
1)
Section – A is Compulsory.
2)
Attempt any four question from section-B.
3)
Attempt any Two questions form section –C.
Section –A
1.
a.
List out the merits and demerits of liquid fuels
over solid fuels.
b.
Define molecular mass.
c.
What is the difference between rotary and
reciprocating compressor?
d.
Define ‘prewhirl’.
e.
What do
you understand by term ‘psychrometry’
f.
Define sensible heat factor.
g.
How heat transfer differ from thermodynamics.
h.
What is heat exchanger?
i.
Define heat rejection ratio.
j.
What are eco friendly refrigerants?
Section –B
2.
What do you understand by ‘minimum air’ and
‘excess air’ in context of combustion?
3.
Explain effect of complete and incomplete
inercooling in multistage reciprocating
compressor.
4.
Explain,
with a neat sketch , the working of a centrifugal compressor and obtain
an expression for the work done.
5.
Distinguish between conduction, convection and
radiation modes of heat transfer.
6.
Discuss briefly the choice of refrigerant
commonly used in automobiles.
Section –C
7.
Explain , briefly, the method used to determine
the higher calorific value of the liquid fuel.
8.
A single stage single acting reciprocating air
compressor is required to handily 30 m3 of free air per hour
measured at 1 bar. The delivery pressure is 6.5 bar and the speed is 450 r.p.m
allowing a volumetric efficiency of 45% an isothermal efficiency of 76% and
mechanical efficiency of 80%; calculate the indicated mean effective pressure
and the power required to drive the compressor.
9.
Explain and show the below mentioned process on
psychometric chart-
a.
Sensible Cooling
b.
Sensible Heating
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