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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.
Module-1
1 a. List and explain any one source of energy. (06 Marks)
b. Explain briefly : (i) Global Warming (ii) Ozone depletion (06 Marks)
c. Find the enthalpy of 1 kg of steam at 12 bar when,
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(1) Steam is dry saturated.
(ii) Steam is 22% wet and
(iii) Super heated to 250 °C
Assume the specific heat of the super heated steam as 2.25 KJ/kgK. (08 Marks)
OR
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2 a. Explain briefly any two of the following:
(i) Zeroth law of thermodynamics.
(ii) First law of thermodynamics.
(iii) Second law of thermodynamics. (06 Marks)
b. Explain formation of steam with the help of Temperature-Enthalpy (T-h) diagram. (08 Marks)
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c. Find the specific volume and enthalpy of 1 kg of steam at 0.8 MPa.
(i) When the dryness fraction is 0.9.
(ii) When the steam is super heated to a temperature of 300°C.
The specific heat of the super heated steam is 2.25 KJ/kgK. (06 Marks)
Module-2
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3 a. With a neat labeled diagram, explain working of Babcock and Wilcox boiler. (08 Marks)
b. Define prime movers and explain working of Pelton wheel turbine with a neat sketch. (12 Marks)
OR
4 a. Define (i) Boiler Mountings. (ii) Boiler Accessories.
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)
Module-3
5 a. Explain 4-s petrol engines with P-V diagram. (10 Marks)
b. Give comparisons between petrol and diesel engines. (05 Marks)
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
(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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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
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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)
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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
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(ii) Facing
(iii) Thread cutting (06 Marks)
b. Explain the working of horizontal milling machine with a simple line diagram. (08 Marks)
c. Explain briefly:
(i) Angular milling.
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(ii) Gang milling.
(iii) Plane milling. (06 Marks)
OR
10 a. Explain briefly the components of a CNC machine with a neat block diagram. (08 Marks)
b. Define Robots and mention its general applications. (07 Marks)
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c. Write short note on:
CNC Machining Center or Turning Center. (05 Marks)
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