# RGPV Previous year Question papers – B. E.(First/Second Semester) – Basic mechanical engineering – June, 2012

BE-2G3(GS)

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.

Unit— I

1. (a) Define the following mechanical properties of engineering material :

(i)              Ductility

(ii)           Hardness

(iii)         Toughness

(iv)         Machinability

(b) Discuss the stress-strain curve for a ductile material.

Or

1. (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

(ii)        Micrometer

Or

1. (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.

Or

(a)         Differentiate between absolute pressure and gauge pressure. How can we measure pressure exerted by

fluid ?

(b)        Differentiate between the following :

(i)             Laminar and turbulent flow

(ii)          Turbine and compressor

Unit-IV

(a)         State and explain First Law of Thermodynamics.

(b)        Explain the working of a simple vapour compression refrigeration cycle.

1. (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.

Unit—V

1. (a) Explain the working of a double acting steam engine

with the help of a neat diagram.

(b) Differentiate between petrol and diesel engine.

Or

1. (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.

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