The balancing weights are introduced in planes parallel to the plane of rotation of the disturbing mass. To obtain complete dynamic balance, the minimum number of balancing weights to be introduced in different planes is

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