Question

Greases are not used to lubricant
a. Rail axle boxes
b. Gears
c. Bearing working at high temperature
d. Delicate instruments​

Answer 1

d) delicate instruments

it is because greases can damage delicate instruments because they have the property to oxidise.

Answer 2

Answer:

d) Greases are not used to lubricant in Delicate instruments​.

Explanation:

• As lubricating oils and greases are the most widely used lubricants.
• In the ordinary axle-boxes of railway carriages the grease.
• Grease lubrication is suitable for any gear system that is open or enclosed, so long as it runs at low speed
• Greases are used in Bearing working at high temperatures as lubricants.
• Greases is not used to lubricant in delicate instruments​ because greases can damage delicate instruments because they have the property to oxidise