3) The best example for semi-liquid lubricant is

Grease

Graphite

Castor oil

Lard oil

Answer is:

Grease

Explanation:

The best example for semi-liquid lubricant is grease.

Grease gun

Ring lubricator

Tell-tale lubricator

Wick feed lubricator

Answer is:

Explanation:

Best example for gravity feed lubrication is Wick feed lubricator.

Water

Lard oil

Soluble oil

Compressed air

Answer is:

The temperature at which an oil gives off sufficient vapour to burn it continuously when ignited

The temperature at which an oil will cease to flow when cooled

The lowest temperature at which an oil gives off sufficient vapour to support a momentary flash without actually setting fire

The temperature at which fire is produced

Answer is:

Explanation:

Fire point is the lowest temperature at which an oil gives off sufficient vapor to support a momentary flash without actually setting fire.

Liquid lubricant

Semi-liquid lubricant

Solid lubricant

None of the above

Answer is:

Explanation:

Graphite is a solid lubricant.