College : Vardhaman College Of Engineering
Degree : B.Tech
Department : Mechanical Engineering
Semester : IV
Subject :Kinematics Of Machinery
Document type : Question Paper
Website : vardhaman.org
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Kinematics Of Machinery Question Paper :
Four Year B. Tech IV Semester Regular/Supplementary Examinations June – 2014
(Regulations : VCE-R11)
(Mechanical Engineering)
Date : 4 June, 2014
Time: 3 hours
Max Marks: 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
Related : Vardhaman College Of Engineering Pulse & Digital Circuits B.Tech Question Paper : www.pdfquestion.in/6347.html
All parts of the question must be answered in one place only
Unit – I
1. a) Explain Whitworth quick return motion mechanism with neat diagram. 7M
b) With the help of neat sketch, discuss the Oldham’s coupling. 7M
2. a) What is the working principle of Scotch yoke mechanism- Explain with neat sketch. 10M
b) How are sliding and turning kinematic pairs different from each other 7M
Unit – II
3. a) In a four bar chain ABCD link AD is fixed and in 15 cm long. BAD = 600 as shown in Fig.1 Find angular velocity of link CD.
b) In a crank and slotted lever mechanism crank rotates of 300 rpm
i. Angular velocity of connecting rod and ii. Velocity of slider
4. a) How can you show Watt mechanism traces an approximate straight line- 10M
b) What are the limitations of a Scott- Russel mechanism- How is it modified- 5M
Unit – III
5. a) Draw a neat sketch of a Davis Steering gear
b) The ratio between the width of the front axle and that of the wheel base mechanism is 0.44. At the instant when the front inner wheel is turned by 180, what should be the angle turned by the outer front wheel for perfect steering.
6. a) Explain the procedure to make the Kleins construction for a slider
b) Enumerate the conditions for correct steering. 5M
Unit – IV
7. Draw the cam profile for following conditions :
Follower type=Knife edged, in-line; lift=50mm; base circle radius=50mm;
for 600 cam rotation; dwell for 450 cam rotation; return stroke with SHM,
rotation; dwell for the remaining period. Determine maximum velocity
during out stroke and return stroke if the cam rotates at 1000 rpm in
8. a) With neat sketches, explain the following :
i. Knife edge followerii. Roller follower
iii. Flat faced followeriv. Spherical follower
b) Define the following :
i. Tracer Pointii. Pitch Curveiii. Base Circleiv. Prime Circlev. Pressure Angle
Unit – V
9. a) A 100mm wide and 10 mm thick belt transmits 5kW of power between shafts. The distance between the shaft centers is 1.5m and the diameter
pulley is 440mm. The driving and the driven shafts rotate at 60 rpm and 150 rpm
respectively. The coefficient of friction is 0.22. Find the stress in the belt
B. Tech IV Semester Supplementary Examinations December – 2013 :
Regulations: VCE-R11
Kinematics Of Machinery :
Mechanical Engineering
Date : 27 December, 2013
Time : 3 Hours
Max. Marks : 75
Answer ONE question from each Unit
All Questions Carry Equal Marks
All parts of the question must be answered in one place only
Unit – I :
1. a) Classify Kinematic pairs based on
i). Surface contact
ii). Relative motion
iii). Type of closure. 9M
b) Define Degree of Freedom. Explain Grubler’s Equation to find DOF for a planar motion. 6M
2. a) What is completely, successfully and incompletely constrained motion? Explain with neat sketch. 6M
b) Explain any two of the quick return mechanisms. 9M
Unit – II :
3. a) Prove that Peaucellier mechanism traces out an exact straight line motion. 8M
b) What are the limitations of Scott-Russell mechanism? 7M
4. In an I.C engine mechanism shown in fig.1, crank OA=100mm and connecting rod AB=100mm with centre of gravity G, 100mm from A. In the position shown the crank have an angular velocity of 75 rad/s and an angular acceleration of 1200rad/s². Find
i). Velocity and acceleration of G,
ii). Angular velocity and angular acceleration of the connecting rod AB. (use relative velocity method).
Unit – III :
5. a) The lengths of the crank and the connectivity rod of a reciprocating engine are 100mm and 500mm respectively. The crank is rotating at 400rpm. Using Klein’s construction, find 1. Velocity of piston 2. Angular velocity of connecting rod 3. Acceleration of the connecting rod when the crank has turned 30: from inner dead centre. 9M
b) Derive the expression for coriolis component of acceleration. 2M
6. a) State and prove Kennedy’s (three centre in line) theorem. 5M
b) Two shafts with an included angle of 160: are connected by a Hooke’s joint. The driving shaft runs at a uniform speed of 1500rpm. The driven shaft carries a flywheel of mass 12kg and 100mm radius of gyration. Find the maximum angular acceleration of the driven shaft and the maximum torque required. 10M
Unit – IV :
7. a) What are the standard follower motions? Explain any two. 8M
b) State and Derive Law of Gearing. 7M
8. Draw the cam profile for following conditions: Follower type = roller follower, in-line; lift = 25mm; base circle radius = 20mm; roller radius = 5mm; out stroke with UARM, for 1200 cam rotation; dwell for 600 cam rotation; return stroke with UARM, for 900 cam rotation; dwell for the remaining period. Determine maximum velocity and acceleration during out stroke and return stroke if the cam rotates at 1200 rpm in clockwise direction. 15M
Unit – V :
9. a) Which are the different types of chains used for power transmission? 5M
b) In an epi -cyclic gear train shown in fig.2, the arm A is fixed to the shaft S. The wheel B having 100 teeth rotates freely on the shaft S. The wheel F having 150 teeth driven separately. If the arm rotates at 200 rpm and wheel F at 100 rpm in the same direction; find
i). Number of teeth on the gear C and
ii). Speed of wheel B. 10M