Engineering Materials - Study Mode

[#226] An important property of malleable cast iron in comparison to grey cast iron is the high
Correct Answer

(B) Ductility

Explanation

Solution: Properties of gray cast iron, • It has good machinability • It has good resistance to galling and wear • It has good ductility

[#227] Malleable cast iron is produced
Correct Answer

(C) From white cast iron by annealing process

Explanation

Solution: Malleable iron is obtained by the heat treatment of white iron so the hard iron carbide structure of ledeburite is converted to a matrix of ferrite or pearlite and graphite is precipitated within the iron. This form of graphite is sometimes referred to as tempered carbon.

[#228] The unique property of cast iron is its high
Correct Answer

(D) Damping characteristics

Explanation

Solution: There are several properties about cast iron is listed below: • It has three to five times more compression strength compared to steel • It has good machinability (gray cast iron) • It has excellent anti-vibration (or damping) properties hence it is used to make machine frames • It has good Sensibility • It has excellent resistance to wear • It has constant Mechanical properties between 20 to 350 degree Celsius • It has very low notch sensitivity • It has Low stress concentration • It bears Low cost • It is Durability • It has Resistance to deformation

[#229] Pick up the wrong statement Nickel and chromium in steel help in
Correct Answer

(B) Improving machining properties

Explanation

Solution: Nickel and chromium in steel help in Providing corrosion resistance and Providing high strength at elevated temperatures and Raising the elastic limit

[#230] Annealing of white cast iron results in production of
Correct Answer

(A) Malleable iron

Explanation

Solution: Malleable iron is obtained by the heat treatment of white iron so the hard iron carbide structure of ledeburite is converted to a matrix of ferrite or pearlite and graphite is precipitated within the iron. This form of graphite is sometimes referred to as tempered carbon.