B, E. (First/Second Semester) EXAMINATION, June, 2012
(Common for all Branches)
BASIC MECHANICAL ENGINEERING
Note : Attempt five questions in all selecting one question from each Unit. All questions carry equal marks.
- (a) Define the following mechanical properties of engineering material :
(b) Discuss the stress-strain curve for a ductile material.
- (a) What is Alloy Steel ? Name two types of alloy steel giving their composition and uses.
(b) Define hardness and explain the testing procedure for determining hardness of engineering material.
Explain the construction and uses of the following measuring instruments :
(i) Dial gauge
- (a) Describe the measurement of flow rate of a fluid
flowing through a circular pipe.
(b) Name and explain five operations which can be performed on a lathe machine.
(a) State Newton’s law of viscosity. What is the effect of temperature on viscosity of water and gas ?
(b) What is fluid coupling ? Explain its working principle.
(a) Differentiate between absolute pressure and gauge pressure. How can we measure pressure exerted by
(b) Differentiate between the following :
(i) Laminar and turbulent flow
(ii) Turbine and compressor
(a) State and explain First Law of Thermodynamics.
(b) Explain the working of a simple vapour compression refrigeration cycle.
- (a) Define the following terms :
(i) Sensible heat of water
(ii) Latent heat of steam
(iii) Dryness fraction of steam
(iv) Saturation temperature of steam
(b) Explain the working of a water tube boiler with the help of a neat sketch.
- (a) Explain the working of a double acting steam engine
with the help of a neat diagram.
(b) Differentiate between petrol and diesel engine.
- (a) A reversible heat engine delivers 0.6 kW power and
rejects heat energy’ to a reservoir at 300 K at the rate of 24 kJ/min. Determine the cycle efficiency and temperature of the thermal reservoir supplying heat to the engine.
(b) Explain the working of a 4-stroke petrol engine.