The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

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

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

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 (where OQ = Distance between the centre of circular flank and centre of nose)

A

$${\omega ^2} \times {\text{OQ}}$$

B

$${\omega ^2} \times {\text{OQ}}\sin \theta $$

C

$${\omega ^2} \times {\text{OQ}}\cos \theta $$

D

$${\omega ^2} \times {\text{OQtan}}\theta $$

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

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

The cam and follower is an example of

A

sliding pair

B

rolling pair

C

lower pair

D

higher pair

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

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

The pressure angle of a cam is the angle between the direction of the follower motion and a normal to the

Related Questions