Related Questions

A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the
A Magnitude of the forces on journal
B Angular velocity of journal
C Clearance between journal and bearing
D Radius of journal
For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$\theta $$ = Semi-block angle)
A $$\frac{{2\mu \sin \theta }}{{\theta + \sin \theta }}$$
B $$\frac{{\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$
C $$\frac{{4\mu \sin \theta }}{{\theta + \sin \theta }}$$
D $$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$
The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$  = Coefficient of friction between the shaft and bearing)
A $${\text{r}}\sin \varphi $$
B $${\text{r}}\cos \varphi $$
C $${\text{r}}\tan \varphi $$
D $$\frac{{\text{r}}}{2}\cos \varphi $$
The coefficient of friction depends upon
A Nature of surfaces
B Area of contact
C Shape of the surfaces
D All of the above
The coefficient of friction between the belt and pulley depends upon the
A Material of belt and pulley
B Slip of belt
C Speed of belt
D All of these
Coefficient of friction depends upon
A Area of contact only
B Nature of surface only
C Both (A) and (B)
D None of these
The coefficient of friction in belt drive depends upon
A Material of belt
B Material of pulley
C Materials of belt and pulley
D Belt velocity
Coefficient of friction depends on
A Nature of surfaces only
B Area of contact only
C Both (A) and (B)
D None of the above
The dynamic friction is the friction experienced by a body, when the body
A is in motion
B is at rest
C just begins to slide over the surface of the other body
D none of the mentioned
Coulomb friction is the friction between
A Bodies having relative motion
B Two dry surfaces
C Two lubricated surfaces
D Solids and liquids

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