Which of the below are inversions of slider crank mechanism?
1. Oscillating cylinder engine mechanism
2. Toggle mechanism
3. Radial cylinder engine mechanism
4. Quick return mechanism

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