B.TECH - Semester 5 theory of machines Question Paper 2021 (dec)
Practice authentic previous year university questions for better exam preparation.
- A pair of involute spur gears with $16^{\prime \prime}$ pressure angle and pitch of module 6 mm is in mesh. The number of teeth on pinion is 16 and its rotational speed is 240 rpm . When the gear ratio is 1.75 , find in order that the interference is just avoided; (a) the addenda on pinion and gear ...
- (a) Derive the expressions for the velocity and acceleration of the slider of a slider crank chain, anahylically.
- Classily kinematic pairs based on constrains 3 Briefly explain line working of Geneva mechanism.
- Wilh the help of a neal sketch explain any one steering mechanism.
- Explain Klien's construction melhod to delermine the velocily and acceleralion of slider crank mechanism.
- What is creep in bells? Explain
- Brielly explain the working of a cone clutch.
- Classify different lypes of gears. P.T.O. 落等
- Whal do you mean by interference in gears?
- Derive the expressions to find the maximum velocity and accoleration of follower of cam if it execules SHM. ( $10 \times 4=40$ Marks) (Answer any one full question from each module, each question carries 20 marks)
- Synthesize a four-bar mechanism to generate a function $y=\sin x$ for $0 \leq \mathrm{K} \leq 90^{\circ}$. The range of the outpul crank may be chosen as $60^{\circ}$ while that of input crank be $120^{\circ}$. Assume three precision points which are to be oblained from Chebyshev spacing. Assume fix...
- In the mechanism shown in figure, the slider $\mathbf{D}$ is constrained to move on a horizontal path. The crank OA is rolating in the counler-clockwise direction al a speed of 180 rpm , increasing al the rate of $50 \mathrm{rad} / \mathrm{s}^{2}$. The dimensions of the various links are as lollows:...
- (a) A single dry plate clutch (ransmils 7.5 kW al 900 rpm . The axial pressure is limiled to $0.07 \mathrm{~N} / \mathrm{mm}^{2}$. If the coefincient of friction is 0.25 , find (i) Mean redius and face width of the friction lining assuming the ratio of the mean radius to the face width as 4, and (ii...
- What do you mean by degrees of freedom? Explain.
- (b) Explain the working of any one quick return mechanism.
- (b) Two pulleys, ane 450 mm diameter and the other 200 mm diameter are on, parallel shafts 1.95 m apart and are connecled by a crossed belt. Find the length of the belt required and the angle of conlact between the belt and each pulley. What power can be transmilled by the belt when the larger pulle...
- Two shalls $A$ and $B$ are co-axial. $A$ gear $C$ ( 50 leelh) is rigidly mounled on shart A. A compound gear D-E gears with C and an internal gear G. D has 20 teelh and gears with C and E has 35 leeth and gears with an internal gear G . The gear G is fixed and is concentric wilh the shall axis. The ...
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