In a screw jack, the effort required to lower the load W is given by
A. $${\text{P}} = {\text{W}}\tan \left( {\alpha - \varphi } \right)$$
B. $${\text{P}} = {\text{W}}\tan \left( {\alpha + \varphi } \right)$$
C. $${\text{P}} = {\text{W}}\tan \left( {\varphi - \alpha } \right)$$
D. $${\text{P}} = {\text{W}}\cos \left( {\alpha + \varphi } \right)$$
Answer: Option C
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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