Download VTU ((Visvesvaraya Technological University) B.E/B-Tech 2019 July ( Bachelor of Engineering) First & Second Semester (1st Semester & 2nd Semester) 18 Scheme 18ME15 Elements of Mechanical Engineering Question Paper
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USN
18ME15/25
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First/Second Semester B.E. Degree Examination, June/July 2019
Elements of Mechanical Engineering
Time: 3 hrs.
Max. Marks: 100
Note: I. Answer FIVE full questions, choosing one full question from each module.
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2. Use of Steam table is permitted.
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Module-1 `'"
6" 1 a. List and explain any one source of energy. (06 Marks)
b. Explain briefly : (i) Global Warming (ii) Ozone depletion (06 Marks)
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c. Find the enthalpy of 1 kg of steam at 12 bar when,
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(ii) Steam is 22% wet and
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(iii) Super heated to 250
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Assume the specific heat of the super heated steam as 2.25 KJ/kgK. (08 Marks)
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i faj 2 a. Explain briefly any two of the following:
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(i) Zeroth law of thermodynamics.
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(ii) First law of thermodynamics.
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(iii) Second law of thermodynamics. (06 Marks)
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b. Explain formation of steam with the help of Temperature-Enthalpy (T-h) diagram. (08 Marks)
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1 8 c. Find the specific volume and enthalpy of 1 kg of steam at 0.8 MPa.
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(ii) When the steam is super heated to a temperature of 300?C.
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Module-2
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cl. .. 3 a. With a neat labeled diagram, explain working of Babcock and Wilcox boiler.
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b. Define prime movers and explain working of Pelton wheel turbine with a neat sketch.
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4 a. Define (i) Boiler Mountings. (ii) Boiler Accessories.
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Explain functions of any five mountings or accessories. (12 Marks)
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b. What are hydraulic pumps? Explain centrifugal pump with a neat sketch. (08 Marks)
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Module-3
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5 a. Explain 4-s petrol engines with P-V diagram. (10 Marks)
- ? b. Give comparisons between petrol and diesel engines. (05 Marks)
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c. A four stroke IC engine running at 450 rpm has a bore diameter of 100 mm and stroke
length 120 mm. The indicated diagram details are,
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(i) Area of the diagram 4 cm
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(ii) Length of the indicated diagram 6.5 cm
(iii)Spring value of the spring used 10 bar/cm.
Calculate the indicated power of the engine.
(05 Marks)
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1-11K
0 01
?(
,.
LABRA%",./
?00
0
lk.
1
USN
18ME15/25
h.r,?
First/Second Semester B.E. Degree Examination, June/July 2019
Elements of Mechanical Engineering
Time: 3 hrs.
Max. Marks: 100
Note: I. Answer FIVE full questions, choosing one full question from each module.
ai
2. Use of Steam table is permitted.
c..
P
Module-1 `'"
6" 1 a. List and explain any one source of energy. (06 Marks)
b. Explain briefly : (i) Global Warming (ii) Ozone depletion (06 Marks)
cz
0
L
..
c. Find the enthalpy of 1 kg of steam at 12 bar when,
e
(I)
Steam is dry saturated.
_0
'?'
ta. =
3
(ii) Steam is 22% wet and
-:-.
.1 F:
(iii) Super heated to 250
?
C
_, II
Assume the specific heat of the super heated steam as 2.25 KJ/kgK. (08 Marks)
-;.-: +
(.1
cr
,1) 0 OR
i faj 2 a. Explain briefly any two of the following:
0
0 .a
(i) Zeroth law of thermodynamics.
0
?
0
0
(ii) First law of thermodynamics.
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.0 .
c,? --,.$
(iii) Second law of thermodynamics. (06 Marks)
2 cr
b. Explain formation of steam with the help of Temperature-Enthalpy (T-h) diagram. (08 Marks)
0
0
1 8 c. Find the specific volume and enthalpy of 1 kg of steam at 0.8 MPa.
O "0
tO = (i) When the dryness fraction is 0.9.
cei cz
3'
(ii) When the steam is super heated to a temperature of 300?C.
ttl
O The specific heat of the super heated steam is 2.25 KJ/kgK. (06 Marks) 4
3
,
1
P, t
Z
O 4?
Module-2
n
?
I
cl. .. 3 a. With a neat labeled diagram, explain working of Babcock and Wilcox boiler.
m
(08 Marks)
O cz
b. Define prime movers and explain working of Pelton wheel turbine with a neat sketch.
0
d
,
.2
(12 Marks)
?45 1,1
3
v3 e
t
:.
ct ,
OR
1.. 0
g
,
q-
72
4 a. Define (i) Boiler Mountings. (ii) Boiler Accessories.
0
t4
? tO
Explain functions of any five mountings or accessories. (12 Marks)
.- -.
b. What are hydraulic pumps? Explain centrifugal pump with a neat sketch. (08 Marks)
. g
s>
O 9.
)
.
'
Module-3
8 . :R. .
5 a. Explain 4-s petrol engines with P-V diagram. (10 Marks)
- ? b. Give comparisons between petrol and diesel engines. (05 Marks)
z
o
c. A four stroke IC engine running at 450 rpm has a bore diameter of 100 mm and stroke
length 120 mm. The indicated diagram details are,
co
t
(i) Area of the diagram 4 cm
-
(ii) Length of the indicated diagram 6.5 cm
(iii)Spring value of the spring used 10 bar/cm.
Calculate the indicated power of the engine.
(05 Marks)
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LIBRARY
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18ME15/25
OR
6 a. Explain with a neat sketch working of vapour compression Refrigerator. (08 Marks)
b. Define : (i) Ton of Refrigerator (ii) COP (iii) Ice making capacity (06 Marks)
C. List commonly used refrigerants and mention the applications of air conditioners . (06 Marks)
Module-4
7 a. Classify ferrous and non ferrous metals. (05 Marks)
b. Define composites, explain any two of the following : (i) Piezoelectric materials
(ii) Shape memory alloys (iii) Optical fibre glass. (05 Marks)
c. Classify metal joining processes, explain TIG (Tungsten Inert Gas) Welding with a neat
sketch. (10 Marks)
OR
8 a. Derive an expression for length of the belt in open belt drive. (10 Marks)
b. Mention advantages and disadvantages of V-Belt drive. (05 Marks)
C. List different types of gears and explain any one with its advantages. (05 Marks)
Module-5
9 a. Explain briefly the following:
(i) Turning
(ii) Facing
(iii) Thread cutting
b. Explain the working of horizontal milling machine with a simple line diagram.
c. Explain briefly:
(i) Angular milling.
(ii) Gang milling.
(iii) Plane milling.
OR
10 a. Explain briefly the components of a CNC machine with a neat block diagram.
b. Define Robots and mention its general applications.
c. Write short note on:
CNC Machining Center or Turning Center.
(06 Marks)
(08 Marks)
(06 Marks)
(08 Marks)
(07 Marks)
(05 Marks)
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This post was last modified on 01 January 2020