RGPV Basic Mechanical Engineering Exam Papers June 2010

RGPV Basic Mechanical Engineering Exam Papers June 2010

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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