Cams topics include: Cams and its classifications, tangent cams and circular arc cams. A machine cam is a component that rotates or moves back and forth to create a motion in a follower. The cam's contacting surface shape is determined by the follower's profile and the prescribed motion. The follower is usually flat or circular.  Cams are often found in engines, industrial printers, manufacturing machines, and other mechanical equipment. They can be found in different materials, sizes, and styles. Some common types of cams include: Barrel cam, Face cam, Disc cam, Heart cam.  Cams can be... Show more

Cams topics include: Cams and its classifications, tangent cams and circular arc cams.

A machine cam is a component that rotates or moves back and forth to create a motion in a follower. The cam's contacting surface shape is determined by the follower's profile and the prescribed motion. The follower is usually flat or circular. 

Cams are often found in engines, industrial printers, manufacturing machines, and other mechanical equipment. They can be found in different materials, sizes, and styles.

Some common types of cams include: Barrel cam, Face cam, Disc cam, Heart cam. 

Cams can be classified into two main types:
Oscillating cams: These cams are typically used in reciprocating engines, such as those found in automobiles and motorcycles. They are typically shaped like a lobe and are mounted on a shaft that rotates as the engine runs. 

Cams can also be classified based on their physical shape. Some types of cams include:
Disk or plate cam: Has an irregular contour to impart a specific motion to the follower
Knife edge follower: Based on surface in contact
Roller follower: Based on surface in contact 

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Machine Dynamics Practice Test: Cams

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25 Questions

1. The cam follower generally used in automobile engines is

spherical faced followerflat faced followerroller followerknife edge follower

2. The angle between the direction of the follower motion and a normal to the pitch curve is called

base anglepitch angleprime anglepressure angle

3. When the flanks of the cam connecting the base circle and nose are of convex circular arcs, then the cam is known as _______

Tanget arc camCircular arc camTangent frameCircular frame cam

4. For high speed engines, the cam follower should move with

cycloidal motionuniform velocitysimple harmonic motionuniform acceleration and retardation

5. Maximum acceleration of the follower is independent of the angle theta.

MaybeFalseDon't KnowTrue

6. For low and moderate speed engines, the cam follower should move with

simple harmonic motionuniform acceleration and retardationcycloidal motionuniform velocity

7. Which of the following displacement diagrams should be chosen for better dynamic performance of a cam-follower mechanism ?

none of thesecycloidal motionsimple hormonic motionparabolic motion

8. The pressure angle of a cam depends upon

angle of ascentoffset between centre lines of cam and followerall of theselift of follower

9. The maximum acceleration of the follower occurs when the angle of action of cam on the circular flank is 90 degrees

FalseMaybeDon't KnowTrue

10. If θ is the angle turned by the cam from the beginning of the roller displacement, how the velocity changes with the change in theta?

Decreases with increase in thetaIncreases with negative change in thetaIndependent of thetaIncreases with increase in theta

11. For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is

maximum and zerozero and minimumzero and maximumminimum and maximum

12. Which of the following motion is not suitable from a practical point of view?

Uniform accelerationSimple harmonicUniform retardationUniform velocity

13. The retardation of a flat faced follower when it has contact at the apex of the nose of a circular arc cam, is given by

ω2×OQω2×OQtanθω2×OQcosθω2×OQsinθ

14. If φ is the angle of action of cam on the circular flank, and r₁ is the base circle of the cam, then the minimum acceleration of the follower is given by the equation.

ω2(R-r1)cos φω2(R+r1)cos φω2(R+r1)sin φω2(R-r1)

15. If a follower is undergoing simple harmonic motion, then at what value of angle of ascent the acceleration is maximum?

4560030

16. The size of a cam depends upon

base circleprime circlepitch circlepitch curve

17. From the given data, calculate the acceleration of follower in m/s² at the beginning of the lift for a symmetrical tangent cam operating a roller follower.
Least radius of the cam is 30 mm; Roller radius is 17.5 mm. The angle of ascent is 75° and the total lift is 17.5 mm. The speed of the cam shaft is 600 r.p.m.

183.2187.6190.1185.5

18. In a radial cam, the follower moves

in a direction parallel to the cam axisin any direction irrespective of the cam axisin a direction perpendicular to the cam axisalong the cam axis

19. Angle of ascent of cam is defined as the angle

of rotation of the cam for a definite displacement of the followerthrough which the cam rotates during the period in which the follower remains in highest positionduring which the follower returns to its initial positionmoved by the cam from the instant the follower begins to rise, till it reaches its highest position

20. When the flanks of the cam are straight and tangential to the base circle and nose circle, then the cam is known as a ____________

Radial camRoller camReciprocating camTangent cam

21. The given figure is a velocity time diagram for which of the follower motion?

Uniform accelerationSimple harmonicUniform velocityUniform retardation

22. Cylindrical cams can be classified as

tangentnone of thesecircularreciprocating

23. Tangent cams are symmetric about __________

Tangent line of cam shaftAlong the rollerRadial line of cam shaftCentre line of cam shaft

24. What is the use of tangent cams?

To operate inlet and exhaust valves of I C engines.To operate the crankshaft of an IC engineTo operate the exhaust valve of I C enginesTo operate the inlet valve of I C engines

25. Throw of a cam is the maximum distance of the follower from

base circlepitch circleroot circleprime circle