Download AKTU B-Tech 1st Sem 2016-2017 RME 101 Elements Of Mechanical Engineering Question Paper

Download AKTU (Dr. A.P.J. Abdul Kalam Technical University (AKTU), formerly Uttar Pradesh Technical University (UPTU)) B-Tech 1st Semester (First Semester) 2016-2017 RME 101 Elements Of Mechanical Engineering Question Paper

, Printed Pages: 7 RME - 10]
(Following PEBer 1?)an Roll No. toribe hileii?i?myh?ii?
Answer Books)
Paper ll) : 2289826 Roll No.
B.TECH.
Regular Theory Examination (Odd Sem-I), 2016-17
ELEMENTS OF MECHANICAL
ENGINEERING
Time : 3 Hours Max. Marks : I 00
SECTION -A
1. Attempt all parts. Write answer of each part in short.
(1 OXZ=20)
a) State Varignon?s theorem of moments.
b) List the various types of loads to which the beam
can be subjected. ,
c) Define Strength, Hardness, Stiffness and
Toughness?
d) Differentiate between macroscopic and
microscopic point ofview, giving some example.
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RME - 10]
e) De?ne thermodynamic System. Surrounding and
Universe.
f) Define the importance of the concept of
?Continuum? in engineering themodynamics.
g) Explain ?rst Law of thermodynamics?
h) State Zeroth Law of thermodynamics and explain
its importance in measurement of temperature.
i) What do you understand by COP and state the
relation of COP for a refrigerator?
j) State parallel axis theorem.
SECTION - B
2. Attempt any ?ve questions from this section :
(5X10=50)
a) A roller of radius r = 300 mm and weighing 2000 N
is to be pulled over a curb of height 150 mm [?g. 1]
by horizontal force F applied to the end of a string
wound tightly around the circumference of the
roller. Find the magnitude of F required to start the
roller move over the curb. What is the least F
through the center of the roller to just turn it over
the curb?
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RME -101
f 300mm
b) Determine the moment of inertia of the L section
shown in ?g. 2 about its centroidal axis parallel to
the legs. Also ?nd the polar moment of inertla.
F.
?*2 10 mm
125 mm
hma?
' 83 min
Fig.2
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d)
RME -101
Determine the forces in all member of the truss
shown in ?g. 3 and indicate the magnitude and nature
of forces on the diagram of the truss. A11 inclined
members are at 60? to horizontal and length ofeach
member is 2 m.
elf] (N 5!] h
I i
1 r
, ,
Derive pure bending equation. And describe the
assumptions taken in the theory of pure bending.
Draw stress -strain diagram for mild steel and cast
iron and describe their salient features.
Describe with neat sketch the sequence of events
in the working of four stroke petrol/diesel engine.
[01/12/2016/23,800 (4)
g)
h)
N ote:
RME - 101
What is heat pump? How does it differ from a
refrigerator? It is proposed to design a refrigeration
plant for a food store which is to be maintained at -
5?C. The ambient temperature is 25?C and the
estimated heat transfer from the store is at the rate
of 5kW. If the system operates on reversed Carnot
heat engine cycle, determine the perfonnance index
and the minimum power required to operate the
refrigeration plant:
Show Otto and Diesel cycle on p?V and T-s diagram.
How does two stroke engine differ from a four
stroke engine?
SECTION - C
Attempt any two questions form this section
(2 X 15=30)
3. A power generating plant uses steam as a working ?uid
and operates on Rankine cycle between a source
temperature of 311.1?C (boiler pressure 100 bar) and a
sink temperature of 329?C (Condenser pressure 0.05
bar)
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RME- lOl RME- 101
i) Determine the cycle ef?ciency and work ratio if
all the processes are reversible. Also determine the
rate of steam generation if the power output of the J 3;; 7?
plant is 1 MW. ]
?
. ? ' 1 :1
ii) How the cycle ef?ciency and work ratio would be ??~-??*:???W-- ?????? ??U?*?~>+ ?-4:
affected if isentropic ef?ciency of turbine is 0.8 ii .7 ??2? g 71
and the saturated liquid coming out of the condenser
is compressed to the boiler pressure with an 7&4
isentropic ef?ciency of 0.9. ?
4. A bar of uniform thickness t tapers from a width of bl at
one end to b2 at other end in a length L. Find the expression
for its extension under the action of axial force P. A steel
?at ofthickness 10 mm tapers uniformly from 60 mm at
one end to 40 mm at other end in a length of 600 mm. If
a bar is subjected to a load of 80 kN. Find its extention.
Take E = 2 X 105 MPa. What is the percentage error if
average area is used for calculating extention?
5. For the beam shown in ?g.4 Draw the shear force and
bending moment diagram.
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