Related Questions

If the loss of prestress is excessive resulting in tensile cracks, which method should be used?
A Preloading method
B Hollow method
C Transparent method
D Layered method
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
A $$\frac{1}{3}$$
B $$\frac{1}{4}$$
C $$\frac{1}{2}$$
D $$\frac{2}{3}$$
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
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 $$\frac{{4\mu \sin \theta }}{{2\theta + \sin 2\theta }}$$
Dynamic friction as compared to static friction is
A Same
B More
C Less
D May be less of more depending on nature of surfaces and velocity
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 ratio of static friction to dynamic friction is always
A Equal to one
B Less than one
C Greater than one
D None of these
Static friction is always __________ dynamic friction.
A Equal to
B Less than
C Greater than
D None of these

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