The velocity of a flat-faced follower when it has contact with the flank of a circular arc cam, is given by
A. $$\omega {\text{R}}\cos \theta $$
B. $$\omega \left( {{\text{R}} - {{\text{r}}_1}} \right)\cos \theta $$
C. $$\omega \left( {{\text{R}} - {{\text{r}}_1}} \right)\sin \theta $$
D. $$\omega {{\text{r}}_1}\sin \theta $$
Answer: Option C
In considering friction of a V-thread, the virtual coefficient of friction (μ1) is given by
A. μ1 = μsinβ
B. μ1 = μcosβ
C. $${\mu _1} = \frac{\mu }{{\sin \beta }}$$
D. $${\mu _1} = \frac{\mu }{{\cos \beta }}$$
The lower pairs are _________ pairs.
A. Self-closed
B. Force-closed
C. Friction closed
D. None of these
In a coupling rod of a locomotive, each of the four pairs is a ________ pair.
A. Sliding
B. Turning
C. Rolling
D. Screw
A kinematic chain is known as a mechanism when
A. None of the links is fixed
B. One of the links is fixed
C. Two of the links are fixed
D. None of these
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