This set of Farm Tractor Multiple Choice Questions & Answers (MCQs) focuses on “Properties of Lubricants”.
1. Why does the lubrication need in an engine system?
a) To reduce the friction loss
b) To increase the friction
c) To decrease the energy
d) To decrease the power
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Explanation: The lubrication system is essential to reduce the friction, wear in engine components such as piston, shafts etc. It also acts as a cooling agent i.e. it carries away the heat energy from the engine.
2. What is the state of lubricant in the lubrication system?
a) Liquid
b) Solid
c) Gases
d) Mechanism
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Explanation: A lubricant is a fluid of specific viscosity used for reducing friction in the moving parts of the engine and mechanisms. It has separate sump often in the crank bottom.
3. Heavy oil is used in the bearings of tractor engines.
a) False
b) True
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Explanation: Heavy oil is not used in the bearings as it may increase the temperatures of the components. Thus lighter oil is used in tractors for providing an optimum thickness of film and adhesiveness.
4. Engine oil acts as a cooling agent.
a) True
b) False
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Explanation: Engine oil is a lubricant which is stored in the sump under the bottom of the engine. It carries away the engine heat, reduces friction in the engine parts, absorbing shocks which reduce the noise made by an engine.
5. What is hydrodynamic lubrication?
a) Use of Liquid in lubrication
b) Use of semi-solid in lubrication
c) Use of belt in lubrication
d) Use of sheet in lubrication
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Explanation: The hydrodynamic lubrication as the name implies the system uses the liquids as lubricants. The lubricants act as a film layer between the friction surfaces which reduces the friction which will be higher when the two solid surfaces slide without lubricant.
6. Why a viscosity is an important factor in a lubricant?
a) To obey hydrodynamic lubrication
b) To ensure hydrostatic lubrication
c) To reduce the volume of lubricant
d) To increase the volume of lubricant
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Explanation: The oil used in every engine has specified viscosity to ensure the smooth movement of machine parts by attaining hydrodynamic lubrication. Viscosity changes according to the temperature.
7. What is the property of the fluid to resist its flow?
a) Resistance
b) Viscosity
c) Velocity
d) Surface tension
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Explanation: The viscosity is a property of a fluid lubricant which shows resistance to its flow. Viscosity decreases when there is an increase in temperature and vice-versa. Viscosity is measured in Pa-s. So the lubricant should withstand both extents of temperatures.
8. What is the viscosity index in lubrication?
a) The measure of change of viscosity
b) The measure of change of volume
c) The measure of change of density
d) The measure of change of thickness
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Explanation: The viscosity index is the measure of change of viscosity of a lubricant according to the change in temperature. It indicates the rate at which oil thins out or gets heavy. The higher viscosity index indicates a lower change in viscosity of the oil.
9. What is the purpose of multi-grade oil in lubrication?
a) To use in both extreme temperatures
b) To use in low temperature only
c) To use in high temperature only
d) To use in sub-zero temperature only
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Explanation: The multi-grade oil is a lubricant having optimum viscosity which will closely remain thin at lower temperatures and vice – versa at higher or operating temperatures accordingly. Multigrade oil is widely used now e.g. 20 W 40 grade where W represents winter.
10. What is pour point of lubrication?
a) The temperature at which fluid do not flow
b) The temperature at which fluid flow increases
c) The temperature at lubrication decreases
d) The temperature at lubrication increases
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Explanation: Pour point is a minimum temperature at which or below the temperature lubricant resists to flow. Thus, lubricant cannot be used in this temperature and lubricant with pour point is selected according to the engine lowest temperature.
11. What is the flashpoint of lubricant oil?
a) The lowest temperature at which oil gets ignited
b) The highest temperature at which oil gets ignited
c) The temperature at which oil can flow
d) The temperature at which oil cannot flow
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Explanation: The flashpoint is the temperature at which the lubricant oil gets sparked. The temperature should be sufficiently high to avoid ignition of lubricants which cause damage to the engine.
12. What is the property of good lubricant?
a) Corrosion resistance
b) Corrosion friendly
c) Low boiling point
d) More oxidation
View Answer
Explanation: A good lubricant should have a high boiling point as the engine has the highest operating temperature. It should be corrosion resistance and resist oxidation. It also has a high viscosity index.
Sanfoundry Global Education & Learning Series – Farm Tractor.
To practice all areas of Farm Tractor, here is complete set of Multiple Choice Questions and Answers.
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