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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. Which of the following is true regarding the limiting friction?
2. If the area of contact between the two surfaces is increased by two times, what will be the effect of it on the force of friction?
3. If α denotes the lead angle and φ, the angle of friction, then the efficiency of the screw is written as
4. What is the maximum value of static friction?
5. ______________ is the friction, experienced between the rubbing surfaces, when the surfaces have a very thin layer of lubricant.
6. The lead of a screw is equal to its pitch, it is known as
7. A screw is said to be over hauling screw, if its efficiency is
8. The force of friction is inversely proportional to the normal load between the surfaces.
9. The angle between the axes of two shafts connected by Hooke’s joint is 18°. Determine the angle turned through by the driving shaft when the velocity ratio is maximum.
10. The distance between the top and bottom surfaces of a thread is known as
11. 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 _____________
12. The force of friction is dependent of the substances of the bearing surfaces.
13. If one surface slides over the other, being pressed together by a normal force N, a frictional force F resisting the motion must be overcome. The ratio F/N is called ______________
14. A particle starts with a velocity 2 m/sec and moves on a straight-line track with retardation 0.1 m/s2. The time at which the particle is 15 m from the startin g point would be
15. The radius of a friction circle for a shaft of radius r rotating inside a bearing is
16. The frictional torque transmitted by a cone clutch is same as that of
17. The angle of inclination of the plane, at which the body begins to move down the plane, is called
18. 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.
19. Co-efficient of sliding friction for rubber on concrete is
20. The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is
21. A wooden block is kept on a polished wooden plank and the inclination of the plank is gradually increased. It is found that the block starts slipping when the plank makes an angle of 18° with the horizontal. However, once started the block can continue with uniform speed if the inclination is reduced to 15°. Find the coefficient of kinetic friction between the block and the plank.
22. The magnitude of the force of friction is ____________ to the force, which tends the body to move.
23. When the load on the rubbing surfaces is carried partly by a fluid viscous film and partly by areas of boundary lubrication, it is known as
24. The absolute viscosity of a lubricant may be defined as the force required to cause a plate of unit area to slide with unit velocity relative to a parallel plate.
25. The ratio of frictional force to normal reaction is known as _______

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