CPS Question and answers
| Que.No | Question/Problem | marks | Link |
|---|---|---|---|
| Q 5 a ) |
Question:
A cam with 40 mm minimum diameter rotates in clockwise at uniform speed and has to give the following motion to a roller follower 15 mm diameter : (i) Follower to complete outward stroke of 40 mm during 120o of cam rotation with uniform velocity. (ii) Follower to dwell for 60o of cam rotation. (iii) Follower will return to its initial position during 120 of cam rotation with uniform acceleration and retardation. (iv) Follower will dwell for remaining 60o of cam rotation. Draw the profile of cam, if the axis of follower passes through the axis of cam. Answer:
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| Q 5 b ) |
Question:
In the toggle mechanism as shown in Fig. (2), D is constrained to move on a horizontal path. The dimensions of various links are AB = 200 mm, BC = 300 mm, OC = 150 mm and BD = 450 mm. The crank OC is rotating in a counter clockwise direction at a speed of 180 rpm. Find, for given configuration (1) velocity and (2) acceleration of ‘D’.
Answer:
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| Que.No | Question/Problem | marks | Link |
|---|---|---|---|
| Q 5 a ) |
Question:
Answer:
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| Q 5 b ) |
Question:
Draw the profile of cam operating a roller reciprocating follower with the following data : Minimum radius of cam = 25 mm lift = 30 mm Roller diameter = 15 mm The cam lifts the follower for 120owith SHM followed by a dwell period of 30o. Then the follower lowers down during 150o of the cam rotation with uniform acceleration and deceleration followed by a dwell period. Answer:
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| Que.No | Question/Problem | marks | Link |
|---|---|---|---|
| Q 5 b ) |
Question:
Draw profile of cam to raise the valve with S.H.M. through 5cm in 120° of revolution, keep it fully raised through 30° and lower it with equal uniform acceleration and retardation through 90° of rotation. The valve remain closed during the rest of rotation. The diameter of the roller is 2 cm and the minimum radius of the cam is 5cm. The axis of the valve rod is offset 2cm from the axis of the shaft. Assume the cam rotating in clockwise direction. Answer:
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| Q 6 b ) |
Question:
PQRS is a four bar chain with link PS fixed. The lengths of links are PQ = 62.5mm, QR = 175mm, RS = 112.5mm and PS = 200mm, The crank PQ rotates at 10 rad/sec clockwise. Draw velocity and acceleration diagram, when angle QPS = 60° and Q and R lie on the same side of PS. Find the angular velocity and angular acceleration of links QR and RS. Answer:
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| Que.No | Question/Problem | marks | Link |
|---|---|---|---|
| Q 5 b ) |
Question:
Construct a cam profile with knife edge follower having an offset of 10 mm for the following data : Outstroke = 60° with SHM Dwell = 30° Return = 60° with uniform velocity and remaining is dwell period. Minimum radius of cam = 50 mm Lift of follower = 25 mm Consider the rotation of cam in clockwise direction. Answer:
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| Que.No | Question/Problem | marks | Link |
|---|---|---|---|
| Q 5 b ) |
Question:
A cam is to give the following motion to a knife edged follower : (i) Outstroke during 60° of cam rotation. (ii) Dwell for the next 30° of cam rotation. (iii) Return stroke during next 60° of cam rotation. iv) Dwell for the remaining 210° of cam rotation. The stroke of the follower is 40 mm and the minimum radius of the cam is 50 mm. The follower moves with uniform velocity during both the outstroke and return stroke. Draw the profile of the cam when the axis of the follower passes through the axis of the camshaft. Answer:
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