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Free download in PDF Cam and Follower Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
The size of a cam depends upon
[A]
base circle
[B]
pitch curve
[C]
pitch circle
[D]
prime circle
(2)
The angle between the direction of the follower motion and a normal to the pitch curve is called
[A]
base angle
[B]
pressure angle
[C]
prime angle
[D]
pitch angle
(3)
The cam follower extensively used in air-craft engines is
[A]
spherical faced follower
[B]
flat faced follower
[C]
roller follower
[D]
knife edge follower
(4)
In a radial cam, the follower moves
[A]
along the cam axis
[B]
in a direction parallel to the cam axis
[C]
in a direction perpendicular to the cam axis
[D]
in any direction irrespective of the cam axis
Answer: in a direction perpendicular to the cam axis
(5)
Which of the following statements is/are true for cam profile?
[A]
In case of roller follower, trace point represents centre of the roller
[B]
Pitch circle is drawn through trace point from the center of cam
[C]
Pitch point on the pitch curve has minimum pressure angle
[D]
All of the above
Answer: In case of roller follower, trace point represents centre of the roller
(6)
Which type of cam does not require any external force to have contact between cam and follower?
[A]
Conjugate cam
[B]
Preloaded spring cam
[C]
Both a. and b.
[D]
None of the above
(7)
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
[A]
3 mm
[B]
17 mm
[C]
5 mm
[D]
12.5 mm
(8)
What is meant by jump phenomenon in cam and follower system?
[A]
Follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces
[B]
Follower looses contact with cam surface when follower rotates beyond particular speed due to gravitational force
[C]
Follower looses contact with cam surface when cam rotates beyond particular speed due to gravitational forces
[D]
None of the above
Answer: Follower looses contact with cam surface when cam rotates beyond particular speed due to inertia forces
(9)
To avoid jump phenomenon, which of the following condition should be true?
Where,
P = preload in spring, ω = cam speed, k = stiffness of spring, e = eccentricity
[A]
ω > √ (me) / ( P + 2 ke)
[B]
ω > √( P + 2 ke) / (me)
[C]
ω < √( P + 2 ke) / (me)
[D]
ω < √ (me) / ( P + 2 ke)
Answer: ω < √( P + 2 ke) / (me)
(10)
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
[A]
60.76 rad/sec
[B]
141.42 rad/sec
[C]
70.81 rad/sec
[D]
None of the above
(11)
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?
Where,
rb = base circle radius
y = displacement of follower
[A]
cot Φ = (dy /dθ) / ( rb + y)
[B]
tan Φ = (dy /dθ) / ( rb + y)
[C]
tan Φ = (dy /dθ) x ( rb + y)
[D]
cot Φ = (dy /dθ) x ( rb + y)
Answer: tan Φ = (dy /dθ) / ( rb + y)
(12)
Which of the following conditions can be used to minimize undercutting in cam and follower mechanism?
[A]
By using internal cams
[B]
By decreasing the size of the cam
[C]
By using larger roller diameter
[D]
None of the above
Answer: By using internal cams
(13)
Which of the following statements is false for SHM follower motion?
[A]
SHM can be used only for moderate speed purpose
[B]
The acceleration is zero at the beginning and the end of each stroke
[C]
The jerk is maximum at the mid of each stroke
[D]
Velocity of follower is maximum at the mid of each stroke
Answer: The acceleration is zero at the beginning and the end of each stroke
(14)
Which motion of follower is best for high speed cams?
[A]
Cycloidal motion follower
[B]
Uniform acceleration and retardation of follower motion
[C]
SHM follower motion
[D]
All of the above
Answer: Cycloidal motion follower
(15)
Cam angle is defined as the angle
[A]
of rotation of the cam for a definite displacement of the follower
[B]
through which, the cam rotates during the period in which the follower remains in the highest position
[C]
during which the follower returns to its initial position
[D]
moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Answer: of rotation of the cam for a definite displacement of the follower
(16)
For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
[A]
minimum and maximum
[B]
maximum and zero
[C]
zero and maximum
[D]
zero and minimum
(17)
The cam follower generally used in aircraft engines is
[A]
flat faced follower
[B]
roller follower
[C]
spherical faced follower
[D]
knife edge follower
(18)
Cylindrical cams can be classified as
[A]
circular
[B]
tangent
[C]
reciprocating
[D]
none of the mentioned
(19)
Throw of a cam is the maximum distance of the follower from
[A]
base circle
[B]
pitch circle
[C]
root circle
[D]
prime circle
(20)
Angle of action of cam is defined as the angle
[A]
moved by the cam from beginning of ascent to the termination of descent
[B]
moved by the cam from the instant the follower begins to rise, till it reaches its highest position
[C]
of rotation of the cam for a definite displacement of the follower
[D]
through which the cam rotates during the period in which the follower remains in the highest position
Answer: moved by the cam from beginning of ascent to the termination of descent