1) The oils are classified as light, medium and extra duty. The light oil has .............
less viscosity
moderate viscosity
maximum viscosity
None of the above
2) The greases are identified according to number 0 to 6. Which one indicates the hardest grease?
0
2
4
6
3) Which one of the following is vegetable oil?
Castor oil
Tallow oil
Lard oil
All of these
4) Two surfaces, 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
5) A lubricant is used with the objective of
providing direct contact between rubbing surface
decreasing frictional resistance
increasing frictional heat
increasing resistance
6) A lubricant should possess high ..............
volatility
acidity
oiliness
None of these
7) The lubricant used in the machine working at low temperature should possess
low pour point
low flash point
high pour point
high cloud point
8) In the case of liquid lubricants. Generally,
fire point is higher than the flashpoint
flash and fire point are identical
fire point is lower than the flashpoint
flash point is higher than the fire point
9) Mineral oils are
poor in oiliness
easily oxidized
very costly
unstable
10) Animal and vegetable oils are
good in oiliness
not thickened in use
very cheap
not oxidized easily
11) Greases are not used to lubricate
gears
rail axle boxes
bearing working at high temperature
delicate instruments
12) Machines operating under high temperature and load are best lubricated by,
solid lubricants
grease
animal oil
mineral oils
13) The single most important property of lubricating oil is
its fire point
cloud point
oiliness
viscosity index
14) The viscosity of the oil is measured by using
redwood viscometer
ostwald viscometer
say bolt viscometer
All of these
15) The temperature at which lubricating oil Will give off sufficient vapours to form combustible mixture with air is known as
fire point
pour point
combustion point
flash point
16) Which temperature for a lubricating oil will be lowest?
fire point
Boiling point
pour point
flash point
17) Two main operations of cutting oil
cleaning and lubricate
wash out cut chips and lubricate
cooling of tool and removing of metal chips
fine finish and lubricate
18) The main property of cutting fluid
specific heat
viscosity
specific gravity
emulsification
19) Which coolant is used for drilling the aluminum job?
Soluble oil
Kerosene
Mineral oil
Dry air
20) Coolant is used because
it is cheap
it is available in big quantity
cooling the tool and wash out chips
None of the above
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