An offset provided in radial cam-translating-follower mechanism serves to

increase the pressure angle during ascent of the follower

decrease the pressure angle during ascent of the follower

increase the pressure angle during ascent of the follower

avoid possible obstruction due to some machine parts

decrease the pressure angle during descent of the follower

In a plate cam mechanism with reciprocating roller follower, the follower has a constant acceleration in the case of

3 – 4 – 5 polynomial motion

In a cam design, the rise motion is given by a simple harmonic motion (SHM) $s = \frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)$ where h is total rise, θ is camshaft angle, β is the total angle of the rise interval. The jerk is given by

$\frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)$

$\frac{\pi \omega}{\beta }\frac{h}{2}\sin \left( {\frac{{\pi \theta }}{\beta }} \right)$

$\frac{{{\pi ^2 \omega^2}}}{{{\beta ^2}}}\frac{h}{2}\cos \left( {\frac{{\pi \theta }}{\beta }} \right)$

$- \frac{{{\pi ^3\omega^3}}}{{{\beta ^3}}}\frac{h}{2}\sin \left( {\frac{{\pi \theta }}{\beta }} \right)$

Assertion (A): Spiral cams find their use in computers.Reason (R): Spiral cams have two types of surfaces, convex and concave.

Both (A) and (R) are true and (R) is the correct explanation for A

(A) is true and (R) is not the correct reason for (A)

Both (A) and (R) are false statements

In a cam-follower, the follower rises by h as the cam rotates by δ (radians) at constant angular velocity ω (radians/s). The follower is uniformly accelerating during the first half of the rise period and it is uniformly decelerating in the latter half of the rise period. Assuming that the magnitudes of the acceleration and deceleration are same, the maximum velocity of the follower is

$\frac{{4h\omega }}{\delta }$

$\frac{{2h\omega }}{\delta }$

For high speed engine the cam follower should move with

Uniform acceleration and retardation

Angle of dwell of cam is defined as the angle

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

During which of the follower returns to its initial position

Of rotation of the cam for definite displacement of the follower

Through which the cam rotates during the period in which the follower remains in the highest position

Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Cylindrical type cam is one.

with circular type of motion of follower

with cylindrical roller follower

with cylindrical shape of follower

with circumferential contour cut in surface of cylinder which rotates about its axis

with circular type of motion of follower

In cycloidal motion of cam follower, the maximum acceleration of follower motion fmax at $\theta = \frac{\phi }{4}$ is

$\frac{{3h\pi {\omega ^2}}}{{{\phi ^2}}}$

$\frac{{h\pi {\omega ^2}}}{{2{\phi ^2}}}$

$\frac{{3h\pi {\omega ^2}}}{{2{\phi ^2}}}$

$\frac{{2h\pi {\omega ^2}}}{{{\phi ^2}}}$

$\frac{{3h\pi {\omega ^2}}}{{{\phi ^2}}}$

CAM_ANGLE_IS_DEFINED_AS_THE_ANGLE?$

through which, the cam rotates during the period in which the follower remains in the highest position

during which the follower returns to its initial position

of rotation of the cam for a definite displacement of the follower

through which, the cam rotates during the period in which the follower remains in the highest position

moved by the cam from the instant the follower begins to rise, till it reaches its highest position

The pressure angle of a cam depends upon

offset between centre lines of cam and follower

Angle of ascent of cam is defined as the angle

during which the follower returns to its initial position

of rotation of the cam for a definite displacement of the follower

through which the cam rotates during the period in which the follower remains in highest position

moved by the cam from the instant the follower begins to rise, till it reaches its highest position

30 + Mcqs in Classification Cams in Machine Dynamics Page 1 McqOptions

1.	For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, is
A.	maximum and zero
B.	zero and maximum
C.	minimum and maximum
D.	zero and minimum
Answer» B. zero and maximum

Discussion

2.	In a cam and follower mechanism, cam is a
A.	Follower
B.	Driver
C.	Frame
D.	Actuator
Answer» C. Frame

Discussion

3.	A flat-faced follower is driven using a circular eccentric cam rotating at a constant angular velocity ω. At time t = 0, the vertical position of the follower is y(0) = 0, and the system is in the configuration shown below.The vertical position of the follower face, y(t) is given by
A.	esin ωt
B.	e(1 + cos 2ωt)
C.	e(1 − cos ωt)
D.	e sin 2ωt
Answer» D. e sin 2ωt

Discussion

4.	A cam displaces its follower by 20 mm through simple harmonic motion (SHM). The cam is rotating at 15 RPM and its angle of rise is 90°. The time period of the SHM will be
A.	4 seconds
B.	2 seconds
C.	1 seconds
D.	0.5 second
Answer» D. 0.5 second

Discussion

5.	An offset provided in radial cam-translating-follower mechanism serves to
A.	decrease the pressure angle during ascent of the follower
B.	increase the pressure angle during ascent of the follower
C.	avoid possible obstruction due to some machine parts
D.	decrease the pressure angle during descent of the follower
Answer» B. increase the pressure angle during ascent of the follower

Discussion

6.	Consider the following statements regarding radial cam nomenclature:1. Motion of the trace point describes movement of the follower2. The curve generated by the locus of trace point is called cam profile3. Actual working curve of cam is called pitch curve4. Smallest circle that can be drawn tangential to cam profile is called base circleWhich of these statements are correct?
A.	1, 2 and 3
B.	1, 3 and 4
C.	1 and 4 only
D.	3 and 4 only
Answer» C. 1 and 4 only

Discussion

7.	A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?
A.	Uniform
B.	Simple harmonic
C.	Cycloidal
D.	Parabolic
Answer» D. Parabolic

Discussion

8.	Consider a circular cam with a flat face follower as shown in the figure below. The cam is rotated in the plane of the paper about point P lying 5 mm away from its centre. The radius of the cam is 20mm. The distance (in mm) between the highest and the lowest positions of the flat face follower is
A.	5
B.	10
C.	40
D.	45
Answer» C. 40

Discussion

9.	For the follower with stroke S, following the cycloidal motion, the radius of the rolling circle will be
A.	S × 2π
B.	$\dfrac{S}{{2\pi }}$
C.	$\dfrac{{2\pi }}{S}$
D.	S + 2π
Answer» C. $\dfrac{{2\pi }}{S}$

Discussion

10.	In a plate cam mechanism with reciprocating roller follower, the follower has a constant acceleration in the case of
A.	Simple harmonic motion
B.	Parabolic motion
C.	Cycloidal motion
D.	3 – 4 – 5 polynomial motion
Answer» C. Cycloidal motion

Discussion

11.	In radial cams the angle between the direction of motion of follower to the normal to the pitch curve is called
A.	Cam angle
B.	Critical angle
C.	Pressure angle
D.	None of the above
Answer» D. None of the above

Discussion

12.	In a cam design, the rise motion is given by a simple harmonic motion (SHM) $s = \frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)$ where h is total rise, θ is camshaft angle, β is the total angle of the rise interval. The jerk is given by
A.	$\frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)$
B.	$\frac{\pi \omega}{\beta }\frac{h}{2}\sin \left( {\frac{{\pi \theta }}{\beta }} \right)$
C.	$\frac{{{\pi ^2 \omega^2}}}{{{\beta ^2}}}\frac{h}{2}\cos \left( {\frac{{\pi \theta }}{\beta }} \right)$
D.	$- \frac{{{\pi ^3\omega^3}}}{{{\beta ^3}}}\frac{h}{2}\sin \left( {\frac{{\pi \theta }}{\beta }} \right)$
Answer» E.

Discussion

13.	For a follower moving with cycloidal motion, the velocity of the follower is maximum at the:
A.	Beginning of the outstroke
B.	End of outstroutstroke
C.	Middle of the outstroke
D.	None of the above
Answer» D. None of the above

Discussion

14.	Assertion (A): Spiral cams find their use in computers.Reason (R): Spiral cams have two types of surfaces, convex and concave.
A.	Both (A) and (R) are true and (R) is the correct explanation for A
B.	(A) is true and (R) is not the correct reason for (A)
C.	(A) is false and (R) is true
D.	Both (A) and (R) are false statements
Answer» C. (A) is false and (R) is true

Discussion

15.	A tappet valve mechanism in an IC engine comprises a rocker arm ABC that is hinged at B as shown in the figure. The rocker is assumed rigid and it oscillates about the hinge B. The mass moment of inertia of the rocker about B is 10-4 kg.m2. The rocker arm dimensions are a = 3.5 cm and b = 2.5 cm. A pushrod pushes the rocker at location A, when moved vertically by a cam that rotates at N rpm. The pushrod is assumed massless and has a stiffness of 15 N/mm. At the other end C, the rocker pushes a valve against a spring of stiffness 10 N/mm. The valve is assumed massless and rigid.Resonance in the rocker system occurs when the cam shaft runs at a speed of ______ rpm (round off to the nearest integer).
A.	790
B.	496
C.	2369
D.	4739
Answer» E.

Discussion

16.	In a cam-follower, the follower rises by h as the cam rotates by δ (radians) at constant angular velocity ω (radians/s). The follower is uniformly accelerating during the first half of the rise period and it is uniformly decelerating in the latter half of the rise period. Assuming that the magnitudes of the acceleration and deceleration are same, the maximum velocity of the follower is
A.	$\frac{{4h\omega }}{\delta }$
B.	hω
C.	$\frac{{2h\omega }}{\delta }$
D.	2hω
Answer» D. 2hω

Discussion

17.	For high speed engine the cam follower should move with
A.	Uniform velocity
B.	Simple harmonic motion
C.	Uniform acceleration and retardation
D.	Cycloidal motion
Answer» E.

Discussion

18.	Angle of dwell of cam is defined as the angle
A.	During which of the follower returns to its initial position
B.	Of rotation of the cam for definite displacement of the follower
C.	Through which the cam rotates during the period in which the follower remains in the highest position
D.	Moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Answer» D. Moved by the cam from the instant the follower begins to rise, till it reaches its highest position

Discussion

19.	Cylindrical type cam is one.
A.	with cylindrical roller follower
B.	with cylindrical shape of follower
C.	with circumferential contour cut in surface of cylinder which rotates about its axis
D.	with circular type of motion of follower
Answer» D. with circular type of motion of follower

Discussion

20.	In cycloidal motion of cam follower, the maximum acceleration of follower motion fmax at $\theta = \frac{\phi }{4}$ is
A.	$\frac{{h\pi {\omega ^2}}}{{2{\phi ^2}}}$
B.	$\frac{{3h\pi {\omega ^2}}}{{2{\phi ^2}}}$
C.	$\frac{{2h\pi {\omega ^2}}}{{{\phi ^2}}}$
D.	$\frac{{3h\pi {\omega ^2}}}{{{\phi ^2}}}$
Answer» D. $\frac{{3h\pi {\omega ^2}}}{{{\phi ^2}}}$

Discussion

21.	In a circular arc cam with a roller follower, acceleration of the follower depends on1. Cam speed and location of centre of circular arc2. Roller diameter and radius of circular arcWhich of the above is/are correct?
A.	1 only
B.	2 only
C.	Both 1 and 2
D.	Neither 1 nor 2
Answer» D. Neither 1 nor 2

Discussion

22.	In a cam – follower mechanism, the follower needs to rise through 20 mm during 60° of cam rotation the first 30° with a constant acceleration and then with a deceleration of the same magnitude. The initial and final speeds of the follower are zero. The cam rotates at a uniform speed of 300 rpm. The maximum speed of the follower is
A.	0.60 m/s
B.	1.20 m/s
C.	1.68 m/s
D.	2.40 m/s
Answer» C. 1.68 m/s

Discussion

23.	CAM_ANGLE_IS_DEFINED_AS_THE_ANGLE?$
A.	during which the follower returns to its initial position
B.	of rotation of the cam for a definite displacement of the follower
C.	through which, the cam rotates during the period in which the follower remains in the highest position
D.	moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Answer» C. through which, the cam rotates during the period in which the follower remains in the highest position

Discussion

24.	For S.H.M. cam, the acceleration of the follower at the ends of the stroke and aimed stroke respectively, i?
A.	maximum and zero
B.	zero and maximum
C.	minimum and maximum
D.	zero and minimum
Answer» B. zero and maximum

Discussion

25.	The cam follower generally used in aircraft engines is
A.	knife edge follower
B.	flat faced follower
C.	spherical faced follower
D.	roller follower
Answer» E.

Discussion

26.	Cylindrical cams can be classified as
A.	circular
B.	tangent
C.	reciprocating
D.	none of the mentioned
Answer» E.

Discussion

27.	Throw of a cam is the maximum distance of the follower from
A.	base circle
B.	pitch circle
C.	root circle
D.	prime circle
Answer» B. pitch circle

Discussion

28.	The pressure angle of a cam depends upon
A.	offset between centre lines of cam and follower
B.	lift of follower
C.	angle of ascent
D.	all of the mentioned
Answer» E.

Discussion

29.	Angle of ascent of cam is defined as the angle
A.	during which the follower returns to its initial position
B.	of rotation of the cam for a definite displacement of the follower
C.	through which the cam rotates during the period in which the follower remains in highest position
D.	moved by the cam from the instant the follower begins to rise, till it reaches its highest position
Answer» E.

Discussion

30.	Cam size depends upon
A.	base circle
B.	pitch circle
C.	prime circle
D.	outer circle
Answer» B. pitch circle

Discussion

20.	In cycloidal motion of cam follower, the maximum acceleration of follower motion fmax at \(\theta = \frac{\phi }{4}\) is
A.	\(\frac{{h\pi {\omega ^2}}}{{2{\phi ^2}}}\)
B.	\(\frac{{3h\pi {\omega ^2}}}{{2{\phi ^2}}}\)
C.	\(\frac{{2h\pi {\omega ^2}}}{{{\phi ^2}}}\)
D.	\(\frac{{3h\pi {\omega ^2}}}{{{\phi ^2}}}\)
Answer» D. \(\frac{{3h\pi {\omega ^2}}}{{{\phi ^2}}}\)

Explore topic-wise MCQs in Machine Dynamics.

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

In a cam and follower mechanism, cam is a

A flat-faced follower is driven using a circular eccentric cam rotating at a constant angular velocity ω. At time t = 0, the vertical position of the follower is y(0) = 0, and the system is in the configuration shown below.The vertical position of the follower face, y(t) is given by

A cam displaces its follower by 20 mm through simple harmonic motion (SHM). The cam is rotating at 15 RPM and its angle of rise is 90°. The time period of the SHM will be

An offset provided in radial cam-translating-follower mechanism serves to

A cam is a mechanical member used to impart a desired motion to a follower by direct contact. Which one of the under-listed follower motion types will produce the least jerk to the system?

Consider a circular cam with a flat face follower as shown in the figure below. The cam is rotated in the plane of the paper about point P lying 5 mm away from its centre. The radius of the cam is 20mm. The distance (in mm) between the highest and the lowest positions of the flat face follower is

For the follower with stroke S, following the cycloidal motion, the radius of the rolling circle will be

In a plate cam mechanism with reciprocating roller follower, the follower has a constant acceleration in the case of

In radial cams the angle between the direction of motion of follower to the normal to the pitch curve is called

In a cam design, the rise motion is given by a simple harmonic motion (SHM) \(s = \frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)\) where h is total rise, θ is camshaft angle, β is the total angle of the rise interval. The jerk is given by

For a follower moving with cycloidal motion, the velocity of the follower is maximum at the:

Assertion (A): Spiral cams find their use in computers.Reason (R): Spiral cams have two types of surfaces, convex and concave.

For high speed engine the cam follower should move with

Angle of dwell of cam is defined as the angle

Cylindrical type cam is one.

In cycloidal motion of cam follower, the maximum acceleration of follower motion fmax at \(\theta = \frac{\phi }{4}\) is

In a circular arc cam with a roller follower, acceleration of the follower depends on1. Cam speed and location of centre of circular arc2. Roller diameter and radius of circular arcWhich of the above is/are correct?

CAM_ANGLE_IS_DEFINED_AS_THE_ANGLE?$

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

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

The pressure angle of a cam depends upon

Angle of ascent of cam is defined as the angle

Cam size depends upon

9.	For the follower with stroke S, following the cycloidal motion, the radius of the rolling circle will be
A.	S × 2π
B.	\(\dfrac{S}{{2\pi }}\)
C.	\(\dfrac{{2\pi }}{S}\)
D.	S + 2π
Answer» C. \(\dfrac{{2\pi }}{S}\)

12.	In a cam design, the rise motion is given by a simple harmonic motion (SHM) \(s = \frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)\) where h is total rise, θ is camshaft angle, β is the total angle of the rise interval. The jerk is given by
A.	\(\frac{h}{2}\left( {1 - \cos \frac{{\pi \theta }}{\beta }} \right)\)
B.	\(\frac{\pi \omega}{\beta }\frac{h}{2}\sin \left( {\frac{{\pi \theta }}{\beta }} \right)\)
C.	\(\frac{{{\pi ^2 \omega^2}}}{{{\beta ^2}}}\frac{h}{2}\cos \left( {\frac{{\pi \theta }}{\beta }} \right)\)
D.	\(- \frac{{{\pi ^3\omega^3}}}{{{\beta ^3}}}\frac{h}{2}\sin \left( {\frac{{\pi \theta }}{\beta }} \right)\)
Answer» E.

16.	In a cam-follower, the follower rises by h as the cam rotates by δ (radians) at constant angular velocity ω (radians/s). The follower is uniformly accelerating during the first half of the rise period and it is uniformly decelerating in the latter half of the rise period. Assuming that the magnitudes of the acceleration and deceleration are same, the maximum velocity of the follower is
A.	\(\frac{{4h\omega }}{\delta }\)
B.	hω
C.	\(\frac{{2h\omega }}{\delta }\)
D.	2hω
Answer» D. 2hω