Archive for July, 2008

Basic Mechanical Engineering June 2008 Question Paper

Unit-I

  • Explain the stress-strain diagrams of mild steel and cast iron with neat sketches.
  • Write short notes on the following: (i) Grey cast iron (ii) Alloy steels

OR

  • Explain the following briefly: (i) Hardness (ii) Ductility (iii) Fatigue strength (iv) Tensile strength.
  • Discuss the effect of the following alloying elements in steel. (i) Chromium (ii) Nickel (iii) Tungesten (iv) Sulphur

Unit-II

  • Write short notes on the following: (i) Errors of measurement (ii) Uncertainty analysis.
  • Explain the construction, working and uses of a micrometer.

OR

  • Write short notes on the following: (i) Surface Plate (ii) Sine Bar
  • Explain the construction and working principle of a lathe machine with neat sketch.

Unit-III

  • State and explain Bernoulli’s equation for incompressible fluids.
  • Write short notes on the following: (i) Viscous flow (ii) Turbulent flow

OR

  • Explain the working principle of a fluid coupling.
  • How pumps ar classified? Explain.

Unit-IV

  • State and explain second law of thermodynamics.
  • What is boiler draught? Derive an expression for chimney height.

OR

  • Explain the following: (i) COP (ii) Boiler efficiency (iii) Natural draught (iv) Entropy

Unit-V

  • Explain Carnot cycle and derive an expression for efficiency of Carnot cycle.
  • What is an indicator diagram? Explain hypothetical and actual indicator diagram of a steam engine.

OR

  • An air standard Otto cycle is designed to operating following data: 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.
  • Explain Diesel cycle and derive an expression for efficiency of Diesel cycle.