Download PTU (I.K.Gujral Punjab Technical University (IKGPTU)) B-Tech (Bachelor of Technology) Mechanical Engineering 2020 December 3rd Sem 59112 Theory Of Machines I Previous Question Paper
Roll No.
Total No. of Pages : 02
Total No. of Questions : 18
B.Tech. (ME) (2012 Onwards)/(MARINE ENGG.) (2013 Onwards)
(Sem.?3)
THEORY OF MACHINES?I
Subject Code : BTME-302
M.Code : 59112
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
Write briefly :
1.
Why idler pulleys are used in belt drive?
2.
Explain the kinematic chain with the help of suitable example.
3.
What is the function of a flywheel? How does it differ from that of a governor?
4.
Compare the performance of knife-edge, roller and mushroom followers.
5.
What is friction? Is it a blessing or curse? Justify your answer giving examples.
6.
Differentiate between brake and dynamometer.
7.
What is meant by effort and power of a governor?
8.
What is the purpose of fast and loose pulley in belt drive? Also mention its applications.
9.
What do you understand by hunting?
10. Find the degree of freedom of a four bar mechanism with help of Kutzbach criterion
equation.
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SECTION-B
11. Sketch and explain any two inversions of a single slider crank chain.
12. Describe the construction and operation of a Bevis-Gibson torsion dynamometer.
13. A belt runs over a pulley of 800 mm diameter at a speed of 180 rpm. The angle of lap is
165? and the maximum tension in the belt is 2 kN. Determine the power transmitted if the
coefficient of friction between the belt and the pulley is 0.3.
14. A double acting steam engine develops 56 kW of power at 210 rpm. The maximum and
minimum speeds do not vary more than 1% of the mean speed and the excess energy is
30% of the indicated work per stroke. Determine the mass of the flywheel if the radius of
gyration of the flywheel is 500 mm.
15. An Ackermann steering gear does not satisfy the fundamental equation of a steering gear
at all positions. Yet it is widely used. Why?
SECTION-C
16. Draw the displacement, velocity and acceleration diagrams for a follower when it moves
with uniform acceleration and retardation. Derive the expression for velocity and
acceleration during outstroke and return stroke of the follower.
17. In a Wilson-Hartnell type of governor, the mass of each ball is 5 kg. The lengths of the
ball arm and the sleeve arm of each bell-crank lever are 100 mm and 80 mm respectively.
The stiffness of each of the two springs attached directly to the balls is 0.4 N/mm. The
lever for the auxiliary spring is pivoted at its midpoint. When the radius of rotation is 100
mm, the equilibrium speed is 200 rpm. If the sleeve is lifted by 8 mm for an increase of
speed of 6%, find the required stiffness of the auxiliary spring.
18. Write note on :
a) Link, mechanism and structure.
b) Elliptical trammel
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