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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. 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
2. The force of friction depends upon the material of which the contact surfaces are made.
3. 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 _____________
4. A boy (30 kg) sitting on his horse whips it. The horse speeds up at an average acceleration of 2.0 m/s 2.If the boy slides back during the acceleration, what can be said about the coefficient of static friction between the horse and the boy.
5. 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.
6. The co-efficient of dynamic friction is _______________ than static friction.
7. ______________ is the friction, experienced between the rubbing surfaces, when the surfaces have a very thin layer of lubricant.
8. 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
9. The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is
10. 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?
11. A Hooke’s joint is used to connect two
12. Two shafts having an included angle of 150° 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. Using the above data, calculate the maximum angular acceleration of the driven shaft in rad/s2.
13. The maximum efficiency of a screw jack is
14. Which of the following screw thread is used for transmitting force in one direction?
15. A heavy block of mass m is slowly placed on a conveyer belt moving with speed v. If coefficient of friction between block and the belt is μ, the block will slide on the belt through distance
16. For very low velocities of rotation, high loads, and with good lubrication can be taken as
17. The lubricant which gives ______________ force of friction is said to have greater oiliness.
18. If the threads are cut on the outer surface of a solid rod, these are known as
19. A 60 mm diameter shaft running in a bearing carries a load of 2000 N. If the coefficient of friction between the shaft and bearing is 0.03, find the power transmitted when it runs at 1440 r.p.m.
20. _____________ friction is the value of the limiting friction just before slipping occurs.
21. Which of the following screw thread is used for lead screw of lathe?
22. 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, after how long will the body come to rest again?
23. 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?
24. If more than one thread is cut in one lead distance of a screw, it is known as
25. 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

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