RGPV Previous Year Question Papers BE

Basic Mechanical Engineering 2nd Sem Dec 2011

Note   -Attempt five questions in all selecting one question from each Unit.

Use of Steam table is permitted. Assume suitable missing data, if any.

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

(i)  Ductility

(ii)         Brittleness

(iii)      Toughness

(a)       Discuss the iron-carbon diagram and various allotropies of steel.

Or

2. (a) What is cast iron ? What are different types of cast iron?

Discuss their properties.

(b) Define hardness. Explain any hardness testing method brief.

Unit-II

3. (a) Explain the term measurement and measurement error.

(b) What is a sine bar  Explain its use with the help of neat diagram and explain.

Or

4.  Explain the working of vertical drilling machine with the help f neat diagram and explain.

Unit-III

5. Write a short note on hydraulic Turbine and fluid coupling explaining their working with the help of neat sketches.     14

Or

6. (a) Differentiate between Laminar and Turbulent flow.

(b) state Newton’s law of  The velocity  distribution of flow over a flat plate is given y u= 1/3 y2 – 1/4  – 1/4  y,Where u is the velocity of water in m/sec.

at a distance  m above the plate. Determine the shear stress at a distance 1-8 m above the plate.

Unit-IV

7. (a) Differentiate between the following .

(i)             Boiler mounting and Accessory

(ii)           Natural Draught and Forced Draught

(iii) Vapour compression and vapour absorpuo refrigeration system

(b) What is eco-friendly refrigerant ? Name any refrigerant and its properties.

Or

1. (a) What is Second Law of Thermodynamics ? Explain the

two statements of this law.

(b) Define boiler efficiency and C. O. P. of a refrigeration system.

Unit-V

1. (a) What is a steam engine ? Give its classification.

(b) Dry saturated steam at 10 bar is admitted into the cylinder of a double acting, single cylinder steam engine. The cylinder  diameter is 275 mm and stroke 650 mm. Cut-off occurs at 50% of the stroke length . and pressure is 1-5 bar. Assuming a diagram factor of  0.75, find the indicated power of the engine, if it runs at 380 r. p. m.

Or

1. (a) Differentiate between two-stroke and four-stroke I. C. engine.

Explain the working of four-stroke petrol engine.

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