The size of a cam depends upon
The angle between the direction of the follower motion and a normal to the pitch curve is called
The cam follower extensively used in air-craft engines is
In a radial cam, the follower moves
Answer: in a direction perpendicular to the cam axis
Which of the following statements is/are true for cam profile?
Answer: In case of roller follower, trace point represents centre of the roller
Which type of cam does not require any external force to have contact between cam and follower?
A cam operating roller follower has the following dimensions, radius of base and nose circle as 15 mm and 10 mm respectively and distance between them is 8 mm. Determine lift made by the follower
What is meant by jump phenomenon in cam and follower system?
Answer: Follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces
To avoid jump phenomenon, which of the following condition should be true?
P = preload in spring, ω = cam speed, k = stiffness of spring, e = eccentricity
Answer: ω < √( P + 2 ke) / (me)
Calculate the limiting speed to avoid cam jump, if an eccentric plate circular cam has eccentricity of 30 mm and provides motion to the follower of 4 kg mass. Stiffness of the spring is 30 N/mm2. Preload in the spring is 600 N
Which of the following equation is used to measure pressure angle between direction of follower motion and force exerted by the cam on follower when eccentricity is zero?
rb = base circle radius
y = displacement of follower
Answer: tan Φ = (dy /dθ) / ( rb + y)
Which of the following conditions can be used to minimize undercutting in cam and follower mechanism?
Answer: By using internal cams
Which of the following statements is false for SHM follower motion?
Answer: The acceleration is zero at the beginning and the end of each stroke
Which motion of follower is best for high speed cams?
Answer: Cycloidal motion follower
Cam angle is defined as the angle
Answer: of rotation of the cam for a definite displacement of the follower
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
The cam follower generally used in aircraft engines is
Cylindrical cams can be classified as
Throw of a cam is the maximum distance of the follower from
Angle of action of cam is defined as the angle
Answer: moved by the cam from beginning of ascent to the termination of descent