R.G.P.V. Bhopal (MP)
B.E. (1st/2nd Semester) EXAM, JUN-2010
BASIC MECHANICAL ENGG [ BE-203 ]
Time:3 Hrs Max Marks:100 Min Marks:35
Note:-Attempt FIVE questions,selecting ONE questions from each unit.Suitably assume any missing data.All questions carry equal marks.UNIT-I
Q.1.(a) Explain the stress-strain diagrams of mild steel and cast iron with neat sketches ? 10
(b) Write short notes on the following: 10
(i) Grey cast iron
(ii) Alloy steels
OR
Q.2 (a) Explain the following briefly: 10
(i) Hardness
(ii) Ductility
(iii) Fatigue strength
(iv) Tensile strength
(b) Discuss the effect of the following alloying elements in steel? 10
(i) Chromium
(ii) Nickel
(iii) Tungesten
(iv) Sulphur
UNIT-II
Q.3.(a) Write short notes on the following: 10
(i) Errors of measurement
(ii) Uncertainity analysis
(b) Explain the construction, working and uses of a micrometer ? 10
OR
Q.4.(a) Write short notes on the following: 10
(i) Surface Plate
(ii) Sine Bar
(b) Explain the construction and working principle of a lathe machine with neat sketch ? 10
UNIT-III
Q.5.(a) State and explain Bernoulli's equation for incompressible fluids ? 10
(b) Write short notes on the following: 10
(i) Viscous flow
(ii) Turbulent flow
OR
Q.6.(a) Explain the working principle of a fluid coupling ? 10
(b) How pumps ar classified? Explain 10
UNIT-IV
Q.7.(a) State and explain second law of thermodynamics ? 10
(b) What is boiler draught? Derive an expression for chimney height ? 10
OR
Q.8.Explain the following: 20
(i) COP
(ii) Boiler efficiency
(iii) Natural draught
(iv) Entropy
UNIT-V
Q.9.(a) Explain Carnot cycle and derive an expression for efficiency of Carnot cycle? 10
(b) What is an indicator diagram?Explain hypothetical and actual indicator diagram of a steam engine?10
OR
Q.10.(a) An air standard Otto cycle is designed to operating following data : 10
Maximum cycle pressure and temperature : 5 MPa and 2250 K
Minimum cycle pressure and temperature : 0.1 MPa and 300 K
Determine the net work output per unit mass of working fluid and the thermal efficiency.
(b) Explain Diesel cycle and derive an expression for efficiency of Diesel cycle ? 10
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