Engineering Materials - Study Mode

[#91] Pearlite consists of
Correct Answer

(B) 13% cementite and 87% ferrite

Explanation

Solution: Pearlite consists of 13% cementite and 87% ferrite

[#92] Balls for ball bearings are made of
Correct Answer

(D) Carbon-chrome steel

Explanation

Solution: Balls for ball bearings are made of Carbon-chrome steel

[#93] The property of a material essential for spring materials is
Correct Answer

(C) Resilience

Explanation

Solution: resilience is the ability of a material to absorb energy when it is deformed elastically, and release that energy upon unloading.

[#94] Grey cast iron has
Correct Answer

(A) Carbon in the form of free graphite

Explanation

Solution: grey cast iron is a type of cast iron that has a graphitic microstructure

[#95] In which of the following cases, consideration of creep is important
Correct Answer

(D) Gas turbine blades

Explanation

Solution: Gas turbine blade is made up of exotic materials superalloys to withstand in the difficult environment inside the gas turbine. As a consequence of operating the gas turbine at high temperature and high stresses, the turbine blades are subjected to certain deformation (creep).