Visvesvaraya Technological University (VTU) 2006 B.E FIRST SEMESTER , ELEMENTS OF MECHANICAL ENGINEERING - Question Paper

FIRST SEMESTER B.E. DEGREE EXAMINATION, JANUARY 2006
COMMON TO ALL BRANCHES
ELEMENTS OF MECHANICAL ENGINEERING
Time: three hrs. Max. Marks:100
Note: ans any 5 ques..
1. (a) elaborate renewable energy source? explain the advantages and disadvantages of
renewable and conventional energy sources. (6 Marks)
(b) What is Ocean Thermal Energy Conversion (OTEC)? With the help of a simple
sketch discuss how power can be found using OTEC plants. (6 Marks)
(c) two kg wer steam is heated at a constant pressue of two bar until its temperature
increases to 150°C. The heat transferred is 2100kJ. obtain the initial dryness
fraction of steam. presume C steam=2.1kJ/kgK. If needed use the extract of the
steam table given beneath.
EXTRACT OF SATURATION STEAM TABLE
2. (a) Bring out clearly the difference ranging from fire tube and water tube boilers (5 marks)
(b) With the help of a neat diagram discuss briefly the working of a fire tube boiler.
(10 marks)
(c) How are water turbines classified? (5 marks)
3. (a) With the help of a neat sketchy discuss the working of a Francis Turbine.
(5 marks)
(b) How does an Open Cycle Gas turbine Power plant work? discuss briefly with a
suitable diagram. (4 marks)
(c) elaborate internal and external combustion engines? provide examples. (4 marks)
4. (a) With the help of a pV
diagram discuss the working of a 4 stroke diesel Engine.
(6 marks)
(b) describe (i) Compression ratio and (ii) mean effective pressure of an IC engine.
(4 marks)
(c) A person conducted a test on a single cylinder 2 stroke petrol engine and
obtained that the mechanical and brake thermal efficiencies of the engine were 0.7
and 0.2 respectively. The engine with a mean effective pressure of six bars ran at
300 fuel is42, 500 kJ/kg and that the stroke to bore ratio of the engine cylinder is
1.2. obtain the bore and stroke of the engine in cm. (10 marks)
5. (a) What is the difference ranging from refrigeration and air conditioning? discuss.
(4 marks)
(b) define with a neat sketch the working of vapour absorption refrigeration
system. (8 marks)
(c) discuss with the sketch the principle of taper turning by swiveling the compound
tool rest. (8 marks)
6. (a) define with a neat sketch the working of a radial drilling machine. (5 marks)
(b) elaborate the various operations commonly performed on a milling machine?
(6 marks)
(c) discuss the various kinds bonding of grinding wheels and the materials used.
(6 marks)
7. (a) discuss the difference ranging from soldering, brazing and welding. (6 marks)
(b) elaborate the advantages and disadvantages of ball and roller bearings over journal
bearings?
(c) Draw a neat sketch of a drop feed lubrication method and explains its working.
8. (a) elaborate the advantages and disadvantages of gear drives over belt drives
(6 marks)
(b) In a belt drive, the velocity ratio is 3. The driving pulley runs at 400 rpm. The
diameter of the driven pulley is 300 mm. obtain the speed of the driven pulley and
the diameter of the driving pulley. (6 marks)
(c) With the help of a block diagram discuss the closed loop control system. provide
examples.

Earning:   Approval pending.