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Posted Date: 06 Sep 2009 Posted By: Narayanan Member Level: Gold
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2009 Mahatma Gandhi University B.Tech Electrical and Electronics Engineering Basic Mechanical Engineering Question paper
G 5815
B.TECH. DEGREE EXAMINATION, APRIL/MAY 2009
(First and Second semester)
Basic Mechanical Engineering
(Common for all Branches)
Time: 3 hours ; maximum: 100 marks
-------------------------------------------------------
Answer all questions.
Part A [10 x 4 = 40 marks]
01. What is the difference between intensive and extensive properties ? Give examples.
02. Briefly explain the first law of thermodynamics.
03. What is the function of a carburetter ?
04. Give the advantages and disadvantages of air refrigeration.
05. What are the different types of gears? What is a reverted gear train ?
06. What is slip in belt drives ? What is its effect on velocity ratio?
07. Differentiate between impulse and reaction turbines.
08. How do you select a hydraulic turbine based on head available?
09. List the different operations that can be performed on a lathe.
10. What are the common defects that are seen in sand casting?
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Part B. [5 x 12 = 60 marks].
11.
(a) Derive the expressions for work done in a (a) isothermal process, (b) polytropic process.
OR
(b) Explain the Carnot cycle and give its significance. Obtain an expression for the efficiency of the Carnot cycle.
12.
(a) Explain the working of a 4-stroke diesel engine with the help of sketches.
OR
(b) With the help of a diagram explain vapour absorption refrigeration systems.
13.
(a) An open belt drive transmits 36kW with a belt velocity of 5m/s. Determine the tensions on each side of the belt, if the co-efficient of friction is 0.3 and the angle of lap is 180 degree.
OR
(b) Give the comparison listing the fields of application of flat belt, V-belt, gear and rope drives.
14.
(a) Explain the working of a steam turbine. What is compounding in steam turbines ?
OR
(b) Explain the various non-conventional sources of energy. Give their merits and limitations.
15.
(a) What is rolling process ? With the help of sketches ,explain two high, three high, and four high rolling mills.
OR
(b) What are the classifications of milling machines ? With a sketch explain the different parts of a horizontal milling machine.
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