Session 3: Lubrication System
Unit 3: Major Systems and Components of anAutomobile
Textual Question-Answers
Check Your Progress
A. Fill in the blanks
1. Dry or solid friction is produced in …………….
Ans: solid surfaces
2. Dry friction creates a lot of …………….
Ans: heat
3. The objective of lubrication is to reduce …………..
Ans: friction
4. Lubrication provides …………. and ………….. effect.
Ans: cooling and cleaning
B. Multiple choice questions
1. Viscosity is measured using a ………………
(a) barometer
(b) thermometer
(c) viscometer
(d) fathometer
Ans: (c) viscometer
2. Lubricating oil is used for …………….
(a) minimising wear in moving parts
(b) help in keeping parts cool
(c) Both (a) and (b)
(d) None of the above
Ans: (c) Both (a) and (b)
3. Which type of lubrication system is used in a two-stroke engine?(a) petrol system
(b) wet sump system
(c) dry sump system
(d) All of the above
Ans: (a) petrol system
4. Viscosity index is a measure for the change of viscosity with changein …………….
(a) pressure
(b) temperature
(c) volume
(d) mass
Ans: (b) temperature
C. Short answer questions
1. Explain the importance of lubrication in an engine.
Ans: Lubrication is important in an engine because it reduces frictionbetween moving parts, minimises wear and tear, helps in cooling enginecomponents, prevents corrosion, and increases the life and efficiency of theengine.
2. List the properties of a lubricant.
Ans: The properties of a good lubricant are proper viscosity, high viscosityindex, good lubricating ability, resistance to oxidation, corrosion prevention, and good cooling property.
