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


 

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