Basic Mechanical Engg. - Dec 2013

First Year Engineering (Set B) (Semester 1)

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) & Q1 (b)

1 (a) Give classification of engineering materials. Give applications of cast iron and carbon steels (at least - 5) plot stress strain curve for Cast iron. Distinguish between stress-strain curve and true stress-strain curve.(14 marks) 1 (b) How does a stress-strain curve of a brittle material differ from a ductile material? Explain with the help of a plot. On which machine the tensile test of a material is performed. What is the object of performing Fatigue test on a material?(14 marks)

Answer any one question from Q2.(a) & Q2.(b)

2 (a) With the help of a neat sketch explain the working of a Combination set, mentioning its uses. Also give a neat sketch of a Sine bar set up for measuring an angle of a workpiece.(14 marks) 2 (b) Give types of Lathe. Name the various operations which can be performed on a Lathe Machine. What are the advantages of using a Taper Turning Attachment?(14 marks)

Answer any one question from Q3.(a) & Q3.(b)

3 (a) Define the terms:
a) Viscosity
b) Pressure
c) Kinetic energy
d) Datum energy
e) Compressible fluid(14 marks) 3 (b) Define pump, compressor, turbine, positive displacement machine, Pneumatic Machine(14 marks)

Answer any one question from Q4.(a) & Q4.(b)

4 (a) State the differences between the following boilers.
a) Stationary and portable boiler
b) Forced circulation and Natural circulation boiler.
c) Externally and internally fired boiler.
d) Single tube and multi tube boiler.(14 marks) 4 (b) With the help of a neat sketch explain the working of a Babcock and Wilcox Boiler.(14 marks)

Answer any one question from Q5(a) & Q5(b)

5 (a) Define the term Diagram factor, as applied to a steam engine. Also define the term Indicator Diagram and explain how it is obtained?(14 marks) 5 (b) Define the following terms as applied to a steam engine.
a) Clearance
b) Swept volume
c) Mean piston speed
d) Dead centres
e) Crank throw
f) Piston stroke
g) Cylinder bore(14 marks)