Tuesday, August 30, 2016
Roll No. ......................
Total No. of Questions : 09]
B. Tech. (Sem. – 3rd)
THEORY OF MACHINES-I
SUBJECT CODE : ME-203
Paper ID : [A0802]
Time : 03 Hours
Instruction to Candidates:
1. SECTION-A is COMPULSORY consisting of TEN questions carrying
TWO marks each.
2. SECTION-B contains FIVE questions carrying FIVE marks each and
students has to attempt any FOUR questions.
3. SECTION-C contains THREE questions carrying TEN marks each and
students has to attempt any TWO questions.
l. Write short notes on :
(a) What is High Pair ?
(b) Explain why higher cannot be inverted?
(c) Explain Acceleration Centre of a Link.
(d) For the design of bearing why we use uniform pressure theory ?
(e) Write the applications of single plate clutch.
(f) Write the applications of cone clutch.
(g) What is the Law of Belting ?
(h) What is the advantage of using double Hooke’s joint ?
(i) What is the difference between governor and flywheel ?
(j) Why cycloidal profile is preferred over S.H.M. profile for cams used
in high speed applications ?
2. In Fig-1 a slider crank chain is shown
Which mechanism is obtained from the chain if link 3 is fixed ? Explain.
3. For the configuration shown in Fig.-2, determine VD by instantaneous
centre method if VA = 635 mm/sec with turning counter clockwise.
4. The initial tension in a flat belt drive is 1800 N. The angle of lap on the
smaller pulley is 170°. The coefficient of friction of the belt and pulley surface is 0·25. The pulley has a diameter of 0·9 m and it runs at 540 r.p.m. Determine the power that can be transmitted at the above speed. Neglect centrifugal tension.
5. In a turning moment diagram, the areas above and below the mean
torque line taken in order are 395, 785, 140, 440, 1060 and 370 mm 2, having scales of 1 mm = 5 N-m and 1 mm = 10° along Y and X axis respectively. Find mass of flywheel at a radius of gyration 150 mm and maximum fluctuation of speed is limited to 1·5% of mean speed which is 1800 r.p.m.
6. A band brake is lined with 10 wooden blocks each of which subtends an
angle of 18° at the centre of the brake drum. Find the ratio between the greatest and the least tensions in the band when the brake is in action. Take = 0·36.
7. Two parallel shafts indicated in Fig.-3 are connected by an intermediate
shaft with a Hooke’s joint at each end. Show that the joints should be oriented to obtain a constant angular velocity ratio between the driving and driven shafts.
The intermediate shaft of the above arrangement has a mass moment of inertia 3 × 10–3 kg-m 2 and is inclined at 30° to the axes of the driving and driven shafts. If the driving shaft rotates uniformly at 2400 r.p.m. with a steady input torque of 300 N-m, determine the maximum fluctuation of output torque
8. A governor is shown in Fig.-4 schematically. The two links which carry
the balls of mass m each are connected by a spring of stiffness k and has a natural length of 2e. Find out the expression for the inclination of the links with vertical when the governor rotates at a speed .
9. For a cam follower system shown in Fig.-5, draw the displacement
diagram for the follower and cam profile. Motion of the follower is as follows : Rise through 20° in 90° cam rotation in SHM, dwell in 90° cam rotation, S.H.M. fall in 90° cam rotation, dwell during 90° cam rotation. If N = 2500 r.p.m., find the max. angular velocity and angular acceleration of the pivoted follower
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