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Machine Kinematics Practice Test: Friction
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Avg score: 59% • Most missed: “The force of friction is dependent of the substances of the bearing surfaces.”
Friction topics include: Friction and its types, fluid and solid friction laws, limiting angle of friction, self locking screens efficiency, limiting friction, v thread, pivot and collar bearing and friction clutches. Kinetic friction is a mechanical force that resists movement between two surfaces that are in contact and either rolling or sliding. It's also known as dynamic friction.  Kinetic friction affects the performance and efficiency of machines.  The force of kinetic friction is μk times the normal force on a body. The coefficient of kinetic friction is denoted by the Greek letter... Show more
Machine Kinematics Practice Test: Friction
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25 Questions

1. The force of friction is independent of the roughness of the surface.
2. A body of mass 1 kg is kept on a rough surface having coefficient of friction = 0.25 being pulled by a force of 2N, which frictional force will be acting on the body?
3. Screws used for power transmission should have
4. The force of friction always acts in a direction, ___________ to that in which the body tends to move.
5. Two shafts with an included angle of 160° are connected by a Hooke’s joint. The driving shaft runs at a uniform speed of 1500 r.p.m. The driven shaft carries a flywheel of mass 12 kg and 100 mm radius of gyration. Find the maximum angular acceleration of the driven shaft.
6. The maximum efficiency of a screw jack is
7. A multiple disc clutch has five plates having four pairs of active friction surfaces. If the intensity of pressure is not to exceed 0.127 N/mm2, find the power transmitted at 500 r.p.m. The outer and inner radii of friction surfaces are 125 mm and 75 mm respectively. Assume uniform wear and take coefficient of friction = 0.3.
8. The angle at which the body just begins to slide down an incline is known as ________
9. The ratio of frictional force to normal reaction is known as _______
10. The load cup of a screw jack is made separate from the head of the spindle to
11. Co-efficient of rolling friction is _______________ than co-efficient of sliding friction.
12. A body of mass 1 kg is kept on a rough surface having coefficient of friction = 0.25 being pulled by a force of 2N, what will be the value of friction force in N?
13. A single plate clutch, with both sides effective, has outer and inner diameters 300 mm and 200 mm respectively. The maximum intensity of pressure at any point in the contact surface is not to exceed 0.1 N/mm2. If the coefficient of friction is 0.3, determine the power transmitted by a clutch at a speed 2500 r.p.m.
14. The radius of a friction circle for a shaft of radius r rotating inside a bearing is
15. To ensure self locking in a screw jack, it is essential that the helix angle is
16. The efficiency of square threaded power depends upon
17. When effect of friction is negligible, the force is transmitted by the link from driver to the driven link through the centre line of the pins connecting the link. With friction, the line of action shifts and is tangent to _____________
18. While designing a screw in a screw jack against buckling failure, the end conditions for the screw are taken as
19. The ratio of magnitude of the kinetic friction to the normal reaction between the two surfaces is_____________ than that in case of limiting friction.
20. _____________ friction is the value of frictional force after slipping has occurred.
21. The magnitude of the limiting friction (F ) bears a constant ratio to the normal reaction (RN) between the two surfaces.
22. Co-efficient of sliding friction for rubber on concrete is
23. The distance between the top and bottom surfaces of a thread is known as
24. In automobiles, Hooke’s joint is used between which of the following?
25. A screw is said to be self locking screw, if its efficiency is

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