Engineering Materials - Study Mode

[#161] Tungsten when added to steel __________ the critical temperature.
Correct Answer

(C) Raises

Explanation

Solution: Tungsten when added to steel to raises the critical temperature.

[#162] Which of the following represents the allotropic forms of iron?
Correct Answer

(D) Alpha iron, gamma from and delta iron

Explanation

Solution: Alpha iron, gamma from and delta iron are the allotropic form of iron.

[#163] The addition of which of the following improves machining of copper?
Correct Answer

(A) Sulphur

Explanation

Solution: The addition sulphur improves machining of copper

[#164] Vanadium in high speed steels
Correct Answer

(C) Forms very hard carbides and thus increases wear resistance

Explanation

Solution: The effects of Vanadium refines grain size, increases hardenability, fracture toughness, and resistance to shock loading. Softening at high temperatures, fatigue stress and wear resistance are improved. At greater than 0.05%, there may be a tendency for the steel to become embrittled during thermal stress relief treatments. Vanadium is used in nitriding, heat resisting, tool and spring steels together with other alloying elements.

[#165] Basic solution is one which has pH value
Correct Answer

(A) Greater than 7

Explanation

Solution: Basic solution is one which has pH value Greater than 7