This set of Farm Machinery Multiple Choice Questions & Answers (MCQs) focuses on “Lubrication System”.
1. Which test is used to measure the resistance to flow of the lubricating oil?
a) Pour point test
b) Gravity test
c) Colour test
d) Velocity test
View Answer
Explanation: The viscosity of a fluid is the measure of its resistance to flow. The oil should be viscous enough to maintain a fluid film between the bearing surfaces. In order to measure viscosity of lubricating oil, an instrument called Saybolt viscosimeter is used.
2. What is Poiseuille’s law?
a) η=\(\frac{πpr^4 t}{8Vl} \)
b) η=\(\frac{πpr^4 t}{16Vl} \)
c) η=\(\frac{πpr^4 t}{32Vl} \)
d) η=\(\frac{3πpr^4 t}{8Vl} \)
View Answer
Explanation: Poiseuille’s law is a physical law that gives the pressure drop in an incompressible and Newtonian fluid in laminar flow flowing through a long cylindrical pipe of constant cross section.
Formula for Poiseuille’s law is: η=\(\frac{πpr^4 t}{8Vl} \)
3. What is viscosity index (V.I.)?
a) V.I.=\(\frac{L-U}{L-H}\)*100
b) V.I.=(L-U)+(L+H)
c) V.I.=(L-U)*(L+H)
d) V.I.=\(\frac{L-H}{L-U}\)*100
View Answer
Explanation: Viscosity index is an arbitrary measure for the change of viscosity with variations in temperature. The lower the VI, the greater the change of viscosity of the oil with temperature and vice versa. It is used to characterize viscosity changes with relation to temperature in lubricating oil.
4. Which of the following is not a system of lubrication used on stationary engines, tractor engines and automobiles?
a) Splash system
b) Thermosiphon method
c) Forced feed system
d) Combination of splash and forced feed
View Answer
Explanation: Thermosiphon method is a method of water cooling. It consists of radiator, water jacket, fan, temperature gauge and hose connections. The system is based on the principle that heated water which surrounds the cylinder becomes lighter in weight and it rises upward in liquid column.
5. In which type of filter does the entire quantity of oil is forced to circulate through it before it enters the engine?
a) Oil pressure gauge
b) By pass filter
c) Full flow filter
d) Crankcase breather
View Answer
Explanation: In full flow filter the entire quantity of oil is forced to circulate through it before it enters the engine. A spring-loaded valve is usually fitted in the filter as a protection device against oil starvation in case of filter getting clogged.
6. Which of the following is a semi fluid lubricant, used for slow moving parts?
a) Grease
b) Crankcase breather
c) Relief valve
d) Oil pressure gauge
View Answer
Explanation: Grease is a semi fluid lubricant, used for slow moving parts. It is useful for those parts, which are connected and are not easily accessible, such as universal joints, water pumps, wheel and axle bearings. Grease consists of a mixture of mineral oil and metallic soap along with a few other chemicals.
7. Which of the following is lubrication theory?
a) Fluid film theory
b) Boundary layer theory
c) Fluid film & Boundary layer theory
d) Thermosiphon theory
View Answer
Explanation: According to fluid film theory, the lubricant is supposed to act like mass of globules, rolling in between two surfaces. It produces a rolling effect whereas according to boundary layer theory, the lubricant is soaked in rubbing surfaces and forms oily surface over it.
8. Which test is used to indicate the fire hazards of petroleum products?
a) Colour test
b) Carbon residue test
c) Pour point test
d) Flash fire test
View Answer
Explanation: When an oil is heated to its approximate boiling point, vapour is given off fast enough to burn when contacted with a spark of a flame. The temperature at which vapour flashes momentarily is called Flash point.
Sanfoundry Global Education & Learning Series – Farm Machinery.
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