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. $${\mu _1} = \frac{\mu }{{\cos \beta }}$$
Answer: Option D
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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
Ans is:- option(C) if the angle is 2×B of thread angle
In V threads, the normal reaction acts at an angle beta which is the semi groove angle. This normal reaction is increased as its axial component must be equal to the load W acting in the horizontal direction.
W = R cos beta
or R = W/ cos beta.
Friction F = nu R
or F = (nu W) / cos beta
or F = (nu / cos beta) W
or F = nu' W
where nu' is the virtual coefficient of friction.
Please explain it proper
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