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RGPV First Year Engineering (Set B) (Semester 1)
Basic Mechanical Engg.
May 2014
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

1 (a) Explain the difference between malleability and ductility
2 M
1 (b) Explain the stress-strain diagram for mild steel.
2 M
1 (c) Give the classification of carbon steel.
3 M
Answer any one question form Q1.(d) & Q1.(e)
1 (d) Explain the Steel and Iron Carbon diagram.
7 M
1 (e) A rod 150 cm long and diameter 2 cm is subjected to an axial pull of 20 kN. If the modulus of elasticity of the material of the rod is 2 × 105 N/mm2 determine stress, strain, and the elongation of the rod.
7 M

2 (a) Briefly explain the devices used for measuring the pressure of a fluid.
2 M
2 (b) Explain the principle of temperature measurement.
2 M
2 (c) Describe vernier caliper with neat sketch.
3 M
Answer any one question from Q2.(d) & Q2.(e)
2 (d) Explain the construction and working principle of a simple lathe machine.
7 M
2 (e) Explain the principle of venturimeter with a neat sketch and derive the expression for the rate of flow of fluid through it.
7 M

3 (a) What do you mean by vacuum pressure.
2 M
3 (b) State the Newton's law of viscosity and give examples of its application.
2 M
3 (c) What factors decide whether Kaplan, Francis or a Pelton type turbine would be used in a hydroelectric project?
3 M
Answer any one question from Q3.(a) & Q3.(e)
3 (d) State Bernoulli's theorem and derive equation for the flow of an incompressible fluid. Mention the assumptions made for deriving it.
7 M
3 (e) Calculate specific weight, density, specific volume and specific gravity of petrol, if one liter of petrol weighs 6.867 N.
7 M

4 (a) State and explain second law of thermodynamics.
2 M
4 (b) Show the various process of steam in a T-S diagram.
2 M
4 (c) How boilers are classified? Write down few names of mountings and accessories of a boiler.
3 M
Answer any one question from Q4.(d) & 4.(e)
4 (d) Calculate the internal energy of 1 kg of steam at a pressure of 10 bar, when the steam is
(i) 0.9 dry (ii) dry saturated (iii) super heated to 250 °C
7 M
4 (e) The following observations were made in a boiler
 Coal used = 200 kg/hr Mass of steam = 2000 kg/hr Steam pressure = 11.2 bar Dryness fraction = 0.95 Feed water temperature = 32.15 °C Calorific value of coal = 28800 kj/kg

Calculate the equivalent evaporation from and at 100 °C per kg of coal and boiler efficiency.
7 M

5 (a) What is Carnot cycle and its importance?
2 M
5 (b) Write any four advantage of 4 stroke petrol engine over 2 stroke petrol engine.
2 M
5 (c) For the same compression ratio and heat supplied, state the order of decreasing air standard efficiency of Otto, diesel and dual cycle.
3 M
Answer any one question from Q5.(d) & Q5.(e)
5 (d) Find the power output of a diesel engine working on a diesel cycle with compression ratio of 16 and air flow rate of 0.25 kg/sec. the initial condition of air at 1 bar absolute and 27 °C temperature, heat added per cycle 2500 kJ/kg.
7 M
5 (e) The minimum pressure and temperature in a Otto cycle are 100 kPa and 27 °C. The amount of heat added to the air per cycle is 1500 kJ/kg. Determine the pressures and temperatures at all points of the air standard Otto cycle. Also calculate the specific work and thermal efficiency of the cycle for compression ratio of 8 : 1.
7 M

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