11. The component of the acceleration, parallel to the velocity of the particle, at the given instant is called
12. The component of the acceleration, perpendicular to the velocity of the particle, at the given instant is called
13. The two elements of a pair are said to form a _________ when they permit relative motion between them.
14. The primary unbalanced force is maximum _________ in one revolution of the crank.
15. The secondary unbalanced force is maximum __________ in one revolution of the crank.
16. Which of the following disciplines provides study of inertia forces arising from the combined effect of the mass and the motion of the parts?
17. If some links are connected such that motion between them can take place in more than one direction, it is called
18. The frequency of oscillation of a torsional pendulum is
19. If the number of links in a mechanism is equal to $$l$$, then the numbers of possible inversions are equal to
20. The unbalanced force due to reciprocating masses
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