The frictional torque transmitted in a conical pivot bearing, considering uniform pressure, is (where R = Radius of shaft and $$\alpha $$ = Semi-angle of the cone)
A. $$\frac{1}{2}\mu {\text{WRcosec}}\alpha $$
B. $$\frac{2}{3}\mu {\text{WRcosec}}\alpha $$
C. $$\frac{3}{4}\mu {\text{WRcosec}}\alpha $$
D. $$\mu {\text{WRcosec}}\alpha $$
Answer: Option B
This Question Belongs to Mechanical Engineering >> Theory Of Machine
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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