Question

Assertion (a): machine tool beds are generally made of grey cast iron. reason (r): cast iron possesses good self-lubricating properties.

a.both a and r are individually true and r is the correct explanation of a

b.both a and r are individually true but r is not the correct explanation of a

c.a is true but r is false

d.a is false but r is true

Answer 1

Answer: obviously machine tool bed=grey cast iron

Explanation:

Grey cast iron have good vibration damping properties