LUBRICANTS AND COOLANTS MCQ 3
1) To minimize friction in bearing a thin film of materials is used known as
lubricant
graphite
coolant
cutting oil
2) Which cutting oil is used for stainless steel cutting?
Grease
Lard
Sulphur base mineral oil
None of the above
3) How the lubricants are classified?
Liquid
Semi-liquid
Solid
All of the above
4) What SAE 30 number indicate?
Fire point
Pour point
Flash point
Viscosity
5) Which lubricant is generally used for the lubrication of roller bearing?
Semi-solid
Solid
Liquid
None of these
6) Which one of the following cutting fluid is suitable for drilling mild steel?
Synthetic soluble oil
Distilled water
Soluble oil + water
Terpentine
7) What is the purpose of cutting fluid while drilling?
To avoid colouring of the chips
To avoid the corrosion of polished machine parts
To cool and lubricate the chips and the tool edge
To use it as a cleaning medium and flash the chips
8) Soluble oil is the popular cutting fluid used on mild steel for drilling purpose. Which one of the cutting fluid is suitable on mild steel for surface grinding purpose?
Soluble oil
Synthetic soluble oil
Dry air
Mineral oil
9) State why any coolant is not used while drilling on cast iron?
Due to low cutting speed
Chips does not form while drilling on it
Cast iron itself has self lubricating properties
Cutting tool is made up of strong material
10) The temperature on which the lubricant freezes is called ………….
Flash point
Pour point
Fire point
Viscosity
11) The property of oil by which it can withstand pressure without squeezing out from bearing surfaces.
Specific gravity
Specific volume
Viscosity
Density
12) Which one of the following is NOT a solid lubricant?
Soap stone
Graphite
Wax
Grease
13) To make heavy lubricant and increase its viscosity, 5 to 20 % fatty oil is mixed in the lubricating oil. Such a oil is known as ……………
Organic oil
Synthetic oil
Mineral oil
Blended oil
14) The oils are classified as light, medium and extra duty. The light oil has ………….
less viscosity
moderate viscosity
maximum viscosity
None of the above
15) The greases are identified according to number 0 to 6. Which one indicates the hardest grease?
0
2
4
6
16) Which one of the following is a vegetable oil?
Castor oil
Tallow oil
Lard oil
All of these
17) Two surface, which rub against each other, are coated with graphite. This method of lubrication is called
solid lubrication
liquid lubrication
semi-solid lubrication
None of these
18) A lubricant is used with the objective of
decreasing frictional resistance
providing direct contact between rubbing surface
increasing frictional heat
increasing resistance
19) A lubricant should possess high …………..
volatility
acidity
oiliness
None of these
20) Lubricant used in machine working at low temperature should possess
low pour point
high cloud point
low flash point
high pour point
