Basic Mechanical Engg. - Dec 2014
First Year Engineering (Set A) (Semester 2)
TOTAL MARKS: 100
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any four from the remaining questions.
(3) Assume data wherever required.
(4) Figures to the right indicate full marks.
Answer any one question from Q1 (a), (b), (c), (d), or Q1 (e)
1 (a) Define tensile Strength of a material.(2 marks) 1 (b) State the composition of grey cast Iron and it's applications. GCI(2 marks) 1 (c) What is modules of Elasticity? Give it's unit of measurement.(3 marks) 1 (d) Explain the Iron-Carbon diagram.(7 marks) 1 (e) Define Hardness and explain the Brinell hardness test.(7 marks)
Answer any one question from Q2 (a), (b), (c), (d), or Q2 (e)
2 (a) Define temperature and name one device and it's operating principle for measuring temperature.(2 marks)
2 (b) What is orifice meter. Draw it's diagram and give the formula used for measurement.(2 marks)
2 (c) Explain the operating procedure of vernier caliper.(3 marks)
2 (d) Write a short note on
i) Combination set
ii) Sine bar(7 marks) 2 (e) Explain the quick return mechanism used in shaper with neat sketch.(7 marks)
Answer any one question from Q3 (a), (b), (c), (d), or Q3 (e)
3 (a) Differentiate between real fluid and ideal fluid.(2 marks) 3 (b) Define kinematic viscosity of fluid. What is it's unit of measurement?(2 marks) 3 (c) What is hydrostatic law? Explain it.(3 marks) 3 (d) What is venturimeter? Derive the expression for measuring rate of flow of fluid in a horizontal pipe.(7 marks) 3 (e) What is a Hydraulic turbine? Draw a neat sketch of Pelton turbine and explain it's working.(7 marks)
Answer any one question from Q4 (a), (b), (c), (d), or Q4 (e)
4 (a) What is internal energy?(2 marks) 4 (b) Name boiler mountings and explain one of them.(2 marks) 4 (c) At 1.2 MPa, 250°C steam enters into a turbine and expands to 30°C. Determine the work output of turbine for 10 kg/s of flow rate.(3 marks) 4 (d) Explain the operating principle of a vapour compression refrigeration cycle.(7 marks) 4 (e) In a boiler trial the following observation are made Feed water temperature = 40°C Boiler pressure = 15 bar Dryness Fraction of steam = 0.85 Coal consumption = 450 kg/h Feed water supplied = 3500 kg/hr C.V. of coal = 40,000 kJ/kg Calculate the evaporation factor and equivalent evaporation at 100°C in kg/kg of coal.(7 marks)
Answer any one question from Q5 (a), (b), (c), (d), or Q5 (e)
5 (a) Draw the hypothetical indicator diagram of a steam engine.(2 marks) 5 (b) Draw the p-v diagram of carnot cycle and express it's efficiency.(2 marks) 5 (c) Explain the fundamental difference between otto and diesel cycle.(3 marks) 5 (d) Explain the working of a 4 stroke diesel engine.(7 marks) 5 (e) Differentiate between two stroke and four stroke I.C. engine.(7 marks)