Slideways of a machine are frequently lubricated by

Oilcan

Grease gun

Ring lubricator

Wick feed lubricator

Answer is:

Oilcan

Explanation:

Slide-ways of a machine are frequently lubricated by Oil can.

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10) Which one of the following is the reason that tap water is not preferred as coolant on machine tool ?

It decreases cutting action of the tool

Danger of corrosion

It has insufficient cooling effect

Due to high cooling effect the cutting edges of the tool break off

Answer is:

Danger of corrosion

Explanation:

Danger of corrosion is the reason that tap water is not preferred as coolant on machine tool.

11) Which one of the following frictions occurs in an un-lubricated journal bearing ?

Sliding friction

Rolling friction

Fluid friction

Dry friction

Answer is:

Dry friction

Explanation:

Dry friction occurs in an un-lubricated journal bearing.

12) In which one of the following materials no cutting oil is used when drilling ?

Tool steel

Grey cast iron

Copper

Aluminium

Answer is:

Grey cast iron

Explanation:

In Grey cast iron materials no cutting oil is used when drilling.

13) The effective cutting of steel with hand hacksaw, which one of the following coolants is suitable ?

Cutting oil

Grease

Lard oil

Kerosene oil

Answer is:

Cutting oil

Explanation:

when cutting steel with hand hacksaw, cutting oil is used .

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