This is a curve showing the displacement of the follower as ordinates on a base line that represents one revolution of the cam:

The velocity of the reciprocating roller follower when it has contact with the straight flanks of the tangent cam, is given by (where $$\omega $$ = Angular velocity of the cam shaft)

A

$$\omega \left( {{{\text{r}}_1}{{\text{r}}_2}} \right)\sin \theta $$

B

$$\omega \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\sin \theta \sec 2\theta $$

C

$$\omega \left( {{{\text{r}}_1}{{\text{r}}_2}} \right)\cos \theta $$

D

$$\omega \left( {{{\text{r}}_1} + {{\text{r}}_2}} \right)\cos \theta \,{\text{cosec2}}\theta $$

The period during which the cam follower remains at rest, when cam moves, is known as

A

Constant period

B

Fixed period

C

Dwell period

D

Idle period

In a cam drive with uniform velocity follower, the sharp corners of the displacement diagram are rounded off at the beginning and at the end of each stroke. This is done

A

Because of difficulty in manufacturing cam profile

B

Because of loose contact of follower with cam surface

C

In order to have acceleration in beginning and retardation at the end of stroke within the finite limits

D

Because the uniform velocity motion is a partial parabolic motion

If the co-ordinates of A and B are (4, 1) and (-2, 7) respectively, then the co-ordinates of the midpoint of AB are.

A

(1, 4)

B

(-3, 4)

C

(3, -4)

D

(-1, 4)

The difference between CAD and CAM is that CAD software is directed at product design while CAM software is:

A

concerned with production and control of tool design

B

concerned with management programs

C

designed for communications

D

specifically for PC-board design

E

None of the above

For high speed engines, the cam follower should move with

A

uniform velocity

B

simple harmonic motion

C

uniform acceleration and retardation

D

cyclodial motion

The cam follower generally used in automobile engines is

A

knife edge follower

B

flat faced follower

C

spherical faced follower

D

roller follower

In a radial cam, the follower moves

A

in a direction perpendicular to the cam axis

B

in a direction parallel to the cam axis

C

in any direction irrespective of the cam axis

D

along the cam axis

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

A

uniform velocity

B

simple harmonic motion

C

uniform acceleration and retardation

D

cycloidal motion

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

A

base circle

B

pitch circle

C

root circle

D

prime circle

This is a curve showing the displacement of the follower as ordinates on a base line that represents one revolution of the cam:

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