In under damped vibrating system, if $${{x_1}}$$ and $${{x_2}}$$ are the successive values of the amplitude on the same side of the mean position, then the logarithmic decrement is equal to
A. $$\frac{{{x_1}}}{{{x_2}}}$$
B. $$\log \frac{{{x_1}}}{{{x_2}}}$$
C. $$\log e\frac{{{x_1}}}{{{x_2}}}$$
D. $$\log \left( {{x_1} \times {x_2}} \right)$$
Answer: Option B
This Question Belongs to Mechanical Engineering >> Theory Of Machine
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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
Logarithmic decrement,
Delta =ln (Xn/Xn + 1).
ln = loge.
option c is correct.