Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) (AR)- Automation-And-Robotics 2020 December 4th Sem 63017 Design Of Machine Elements Previous Question Paper
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech.(Automation & Robotics) (2012 & Onward) (Sem.?4)
DESIGN OF MACHINE ELEMENTS
Subject Code : BTPE-401
M.Code : 63017
Time : 3 Hrs. Max. Marks : 60
INST RUCT IONS T O CANDIDAT ES :
1 .
SECT ION-A is COMPULSORY cons is ting of TEN questions carrying TWO marks
each.
2 .
SECT ION-B c ontains F IVE questions c arrying FIVE marks eac h and s tud ents
have to atte mpt any FOUR q ues tions.
3 .
SECT ION-C contains THREE questions carrying T EN marks e ach and s tudents
have to atte mpt any T WO questio ns.
SECTION-A
Answer briefly :
1.
Write the scope of machine design.
2.
Write the sources of design data.
3.
Draw un-symmetric welded sections.
4.
Define pitch and lead.
5.
What is the function of keys?
6.
Write different types of couplings.
7.
What are the main indications of a complete welding symbol?
8.
What are the factors to be considered for designing the fulcrum pin of the lever?
9.
What are the uses of foot lever?
10. Write types of friction clutches.
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SECTION-B
11. Why gibs are used in a cotter joint? Explain with the help of a neat sketch the use of
single and double gib.
12. Discuss the various types of shafts and the standard sizes of transmissions shafts.
13. A square key of 10 ? 10 ? 75 mm is required to transmit 1100 N-m torque from a 60 m
diameter solid shaft. Determine whether the length is sufficient or not if the permissible
shear stress and crushing stress intensities limited to 60 and 170 MPa respectively.
14. State how a bolt of uniform strength is produced.
15. Write short note on design of hand lever.
SECTION-C
16. Discuss the design procedure while considering the economic, aesthetic and ergonomics
aspect.
17. Draw and explain the construction, working, application and design process of split muff
coupling.
18. A vehicle of mass 1200 kg is moving down the hill at a slope of
1:5 at 72 km / h. It is to be stopped in a distance of 50 m. If the diameter of the tyre is 600
mm, determine the average braking torque to be applied to stop the vehicle, neglecting all
the frictional energy except for the brake. If the friction energy is momentarily stored in a
20 kg cast iron brake drum, what is average temperature rise of the drum? The specific
heat for cast iron may be taken as 520 J / kg?C. Determine also the minimum coefficient
of friction between the tyres and the road in order that the wheels do not skid, assuming
that the weight is equally distributed among all the four wheels.
NOTE : Disclosure of Identity by writing Mobile No. or Making of passing request on any
page of Answer Sheet will lead to UMC against the Student.
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This post was last modified on 13 February 2021