Question

For machines operating at the high speed and low pressure
are used.
Heavy
oils
Light
oils
Crude
oils
Diesel
oil
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Answer 1

Answer:

1. ans.(a) heavy oil....

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Answer 2

For machines operating at the high speed and low pressure Light oils  

are used.

• Light oils have less viscosity so offer comparitively lower resistance to the flow so they are used for lubrication of machine parts operating at high speed.
• The light oil also stays at a particular position to offer the least friction possible.
• Whereas heavy oil is used for lubrication of machine parts operating at low speed.