Engineering Materials - Study Mode

[#191] The alloy used for making electrical resistances and heating elements is
Correct Answer

(A) Nichrome

Explanation

Solution: The most common usage of nichrome is as resistance wire, although they are also used in some dental restorations (fillings) and in a few other applications

[#192] The strength is the ability of a material to resist
Correct Answer

(B) Externally applied forces with breakdown or yielding

Explanation

Solution: The Strength of the material is defined as the quality or state of being physically strong, the capacity of an object or substance to withstand great force or pressure

[#193] The stiffness is the ability of a material to resist
Correct Answer

(A) Deformation under stress

Explanation

Solution: Stiffness is defined as the property of a material which is rigid and difficult to bend. The example of stiffness is rubber band

[#194] Which of the following statement is wrong?
Correct Answer

(C) A mechanical mixture of 87% cementite and 13% ferrite is called pearlite

Explanation

Solution: Pearlite is a Mixture of Ferrite and Cementite (alternately arranged as like pearls) obtain 100% pearlite at 727 deg.C. Soft Phase than Austenite but posses better strength than Ferrite.

[#195] Delta iron occurs at temperature of
Correct Answer

(C) Between 1400°C and 1539°C

Explanation

Solution: Delta iron occurs at temperture in between 1400°C and 1539°C