6) Fire point 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:

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

Explanation:

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

Answer is:

Explanation:

Graphite is a solid lubricant.

Answer is:

Explanation:

The best example for splash lubrication is ring lubricator.

Answer is:

Explanation:

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

Answer is:

Explanation:

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