JNTU Kakinada B-Tech 1-2 R161205 ELEMENTS OF MECHANICAL ENGINEERING R16 May 2018 Question Paper

JNTU Kakinada (JNTUK) B-Tech First Year Second Semester (1-2) ELEMENTS OF MECHANICAL ENGINEERING Common to to CHEM, PCE, PE R16 Regulation May 2018 Question Paper

Code No: R161205
I B. Tech II Semester Regular/Supplementary Examinations, April/May – 2018
ELEMENTS OF MECHANICAL ENGINEERING (Com. to CHEM, PCE, PE)Time: 3 hours Max. Marks: 70
Note: 1. Question Paper consists of two parts (Part-A and Part-B) 2. Answering the question in Part-A is Compulsory
3. Answer any FOUR Questions from Part-B
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PART ?A
1. a) Give the relation between E, N, and K. Mention its importance. (2M)
b) Explain the theory of simple bending. (3M)
c) Give a brief note on Lame?s equation. (3M)
d) List out the uses of compressed air. (2M)
e) Sketch basic engine components and give its nomenclature. (2M)
f) Define velocity ratio and slip and give the expressions for the same. (2M)
PART -B
2. a) Explain the typical stress-strain curve with a neat sketch, obtained from a direct
tension test on a mild steel rod and explain the salient points. (7M)
b) A 500 mm diameter circular reinforced concrete column is having 8 bars of 20
mm diameter. The column is subjected to an axial thrust of 875 kN. Determine the
stresses developed in concrete and steel. Assume Esteel = 12Econcrete. (7M)
3. Define Neutral axis. Sketch the bending stress distribution across the cross section
of a rectangular beam section 230 ? 400 m subjected to 60 KNm moment. (14M)
4. Compare the values of maximum and minimum hoop stresses for a cast steel
cylindrical shell of 600 mm external dia. and 400 mm internal dia. subjected to a
pressure of 30N/mm
2
applied. (a) Internally and (b) Externally. (14M)
5. Discuss boiler mountings and accessories with neat sketches. (14M)
6. a) Illustrate the constructional details of an I.C engines. Explain briefly about
important components. (7M)
b) How do you classify I.C. Engines? Explain in detail. (7M)
7. a) A shaft runs at 80 rpm and drives another shaft at 150rpm through belt drive. The
Diameter of the driving pulley is 600mm. Determine the diameter of the driven
pulley in the following cases:
i. Neglecting belt thickness.
ii. Taking belt thickness as 5mm.
iii. Assuming for case (ii) a total slip of 4% and
iv. Assuming for case (ii) a slip of 2% on each pulley. (9M)
b) Discuss Epicyclic gear train with a neat sketch. (5M)
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SET – 1
R16