Select the best answer out of given choices: A link that is pivoted to the groun

Question

Select the best answer out of given choices: A link that is pivoted to the ground and makes complete rotation is called: (a) Crank (b) rocker (c) coupler (d) revolute A joint in which there is line contact between the elements is called (a) Lower pair 2. (b) higher pair (c)second order (d) force closed 3The number of independent coordinates required to define the position of a mechanism is: (a) Velocity (b) lower pair (c)joint (d) degrees of freedom A four-bar mechanism has link dimensions 10 cm, 50 em 40 cm and 30 cm. The link with 10 cm length is fixed. What type of four-bar is this? (a) crank-rocker (b) double crank 4. (e) double rocker (d) triple rocker 5. In the four-bar mechanism shown, the direction of velocity Vs is: (a) from B towards A (b) from B towards O (c) perpendicular to OaB (d) perpendicular to AB 6. In the four-bar mechanism shown, the direction of acceleration a is: (a) from B towards A (c) perpendicular to O4B (b) from B towards O4 (d) perpendicular to AB 04 7. What is the type of the gears shown? (a) spur gears (d) worm gears (b) helical gears (e) bevel gears 8. If the smaller gear shown has 20 teeth and rotates at 100 rpm while the larger gear has 50 teeth, the speed of the larger gear is: (a) 20 rpm (b) 40 rpm (c) 150 rpm (d) 250 rpm 9. If the unbalance masses in a rotating system are all in the same plane, there is (a) no unbalance (b) static unbalance (c) dynamic unbalance (d) no motion 10. For a link in equilibrium with only two forces and a moment, the forces must be: (a) equal in magnitude (b) parallel (c) opposite in direction (d) all of the above

Explanation / Answer

1. Crank is pivoted to the ground and makes the complete rotation.

2. A higher pair is a constraint that requires a curve or surface in the moving body to maintain contact with a curve or surface in the fixed body. It has a point or line contact.

3. Its is known s degree of freedom.

4.When the shortest link is fixed the mechanism that is formed is of double crank.

5. Velocity will be perpendicular to o4b.

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