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Machine Kinematics Practice Test: Friction
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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. 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.
2. The force of friction is _____________ for different lubricants.
3. Two shafts connected by a Hooke’s joint have an angle of 18 degrees between the axes.
Find the angle through which it should be turned to get the velocity ratio maximum.
4. 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.
5. A body of weight W is required to move up the rough inclined plane whose angle of inclination with the horizontal is α. The effort applied parallel to the plane is given by
6. When the lubricants are smeared on two different surfaces, it is found that the force of friction with one lubricant is different than that of the other.
7. A stone is projected horizontally from a cliff at 10 m/sec and lands on the ground below at 20 m from the base of the cliff. Find the height of the cliff.
8. The maximum efficiency of a screw jack is
9. The angle of inclination of the plane, at which the body begins to move down the plane, is called
10. The distance between the top and bottom surfaces of a thread is known as
11. The frictional torque transmitted by a disc or plate clutch is same as that of
12. A car moving with speed u can be stopped in minimum distance x when brakes are applied. If the speed becomes n times, the minimum distance over which the car can be stopped would take the value
13. Two particles with masses in the ratio 1 : 4 are moving with equal kinetic energies. The magnitude of their linear momentums will conform to the ratio
14. A body of mass 1 kg is kept on a rough surface is being pulled by a force of 2N, what will be the value of coefficient of friction if it just begins to move. Take g = 10m/s2.
15. __________ is used to resist the end thrust of the shafts.
16. The angle of inclination of the plane, at which the body begins to move down the plane is called
17. A screw jack has square threads and the lead angle of the thread is α. The screw jack will be self locking when the coefficient of friction (μ) is
18. The distance from a point of a screw to a corresponding point on the next thread, measured parallel to the axis of the screw is the
19. 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 static friction between the block and the plank.
20. The core diameter of a screw thread is also known as
21. The power from the engine to the rear axle of an automobile is transmitted by means of
22. Double hooke’s joint can be used to keep the angular velocity of the shaft constant.
23. 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.
24. 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.
25. A Hooke’s joint is used to connect two

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