Mechanical Engineering - Engineering Materials

46.
When filing or machining cast iron makes our hands black, then it shows that __________ is present in cast iron.
cementite
free graphite
Answer: Option
Explanation:
No answer description is available. Let's discuss.

47.
According to Indian standard specifications, a plain carbon steel designated by 40 C8 means that the carbon content is
0.04%
0.35 to 0.45%
0.4 to 0.6%
0.6 to 0.8%
Answer: Option
Explanation:
No answer description is available. Let's discuss.

48.
Wrought iron
is a ductile material
can be easily forged or welded
cannot stand sudden and excessive shocks
all of these
Answer: Option
Explanation:
No answer description is available. Let's discuss.

49.
In iron, the presence of carbon in free form is called graphite.
Agree
Disagree
Answer: Option
Explanation:
No answer description is available. Let's discuss.

50.
In a body centred cubic space lattice, there are nine atoms out of which eight atoms are located at the corners of the cube and one atom at its centre.
Yes
No
Answer: Option
Explanation:
No answer description is available. Let's discuss.