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IC Engine Practice Test: Engine Friction and Lubrication
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Engine Friction and Lubrication topics include: Engine and mechanical friction, lubrication types and properties, classification and mechanisms of lubricating systems. Friction is the resistance to motion caused by sliding. Lubrication is the use of fluids, gases, vapors, plastic substances, and solids to reduce friction and wear and tear between two moving surfaces.  Engines have several types of friction, including: Mechanical friction: The resistance to motion of mechanical parts in an operating engine Coulomb friction: Occurs when there is no lubrication and the force creating... Show more
IC Engine Practice Test: Engine Friction and Lubrication
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25 Questions

1. Higher the oil viscosity ____________ is the friction loss.
2. Semi pressure system does not enables higher bearing loads and engine speeds to be employed as compared to splash system.
3. In full pressure system, oil from the oil sump is pumped under pressure to the various parts requiring lubrication.
4. In a closed system, the fresh air supply is taken to the crankcase from the carburetor.
5. The frictional mean effective pressure ____________ as the compression ratio is increased.
6. Ball and roller bearings and tappet rollers are subjected to rolling friction.
7. As the load increases the maximum pressure in the cylinder has a tendency to increase slightly.
8. Caster oil is usually compounded with heavy mineral oils for making extreme pressure lubricants.
9. During starting of the engine, the journal bearings operate in ____________ friction.
10. Mist lubrication system is used for ____________ stroke cycle engines.
11. All the lubricating oil from the oil sump, must pass through an oil filter before it is supplied to the engine bearings.
12. The difference between I.P. and B.P. is known as total engine friction loss.
13. A circular cylindrical shaft called journal rotates against a cylindrical surface called the bearing.
14. Greases perform better than oils under which of the following conditions?
15. The bearing friction includes the friction due to the main bearing connecting rod bearing and other bearings.
16. In the drip system oil is fed to machine parts drop by drop, from an oil cup.
17. Which of the following are the types of synthetic lubricants?
18. The emulsification number is an index of the tendency of an oil to emulsify with water.
19. Bearings maintain very close tolerances and are likely to be damaged by an foreign abrasive material entering the lubrication line.
20. What are the various types of greases used for lubrication?
21. Fatty oils from animal and vegetable origin are sometimes used alone but are frequently mixed with mineral oils.
22. Greases perform better than oils under conditions requiring ___________
23. Blow by losses vary as the square root of inlet pressure, and increases as the compression ratio are ____________
24. A rise in cooling water temperature ____________ engine friction through its effect on oil viscosity.
25. ____________ is the property of a lubricating oil due to which the oil retains a thin film between the two surfaces.

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