Bangalore University 2007 B.E Mechanical Engineering First Semester BE , .06/.07 - Question Paper

NEW SCHEME
First Semester B. E. Degree Examination, Dec.06/Jan.07
Common to All Branches
Elements of Mechanical Engineering

Time: three Hrs.] [Max. Marks: 100

Note: ans any 5 full ques. picking at lowest
2 ques. from every PART A and PART B.

PART A


1. a. elaborate renewable and non-renewable sources of energy? explain the advantages and disadvantages of renewable over conventional sources of energy. (08 Marks)
b. describe the subsequent terms:
i)Dryness fraction ii) Specific quantity iii) Latent heat (06 Marks)
c. obtain the enthalpy of 0.5kgs of stream at a pressure of 10 bar absolute for the subsequent conditions:
i) It is 1.5% wet ii) It is dry saturated iii) It is at a temperature of 200 deg Cent.
presume specific heat as 2.3 kJ/kgk. (06 Marks)

2. a. What is compounding? With a suitable diagram discuss velocity compounding. (10 marks)
b. Differentiate ranging from impulse and reaction water turbines. (05 marks)
c. discuss the working of closed cycle gas turbines. (05 marks)

3. a. elaborate the various efficiencies of an IC engine? describe every 1 of them with equations. (06 Marks)
b. Derive an expression for the thermal efficiency of an engine working on an Otto-cycle. (09 Marks)
c. compute the brake power output of a single cylinder 4 stroke petrol engine which is running at a speed of 400rpm. The load on the brake drum is 24kg and the spring balance reads four kgs. The diameter of the brake drum is 600mm and the rope diameter is 30mm. (05 Marks)

4. a. elaborate the desirable properties of the refrigerant? (04 Marks)
b. With a neat sketch discuss the construction and working of a vapour absorption refrigeration system (10 Marks)
c. Differentiate ranging from refrigeration and air conditioning. (06 Marks)

PART B

5. a. With the help of a neat diagram discuss the various parts of a lathe.
(10 Marks)
b. provide an account of drilling machine classification and general specification (10 Marks)

6. a. Draw a neat and labelled sketch of a horizontal milling machine. State the function of every part. (08 Marks)
b. How is a milling machine specified? (04 Marks)
c. How are abrasive classified? provide examples fore ach kind. (04 Marks)
d. Compare ranging from up milling and down milling. (04 Marks)

7. a. Differentiate ranging from consumable and non consumable electrodes
(05 Marks)
b. State the advantages of coated electrodes. (05 Marks)
c. elaborate the advantages of antifriction bearing? provide their application.
(10 Marks)

8. a. 2 pulleys are connected by a belt drive. The tensions in the slack side and tight side are 800N and 1200N respectively. The diameter of the dirven pulley is one meter and its speed is 240 rpm. Determine the power transmitted. (10 Marks)
b. What is a gear train? discuss simple and compound gear trains.
(10 Marks)

*****

Earning:   Approval pending.