Archive for July, 2008

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.