Questions without answers in Engineering Materials

In a deep drawing operation of a rectangular sheet metal, $30\%$ stretching in length results in $15\%$ reduction in thickness. Assuming volume constancy, the normal anis...

A metal has $\text{FCC}$ crystal structure with $2.71 \mathrm{~g} / \mathrm{cm}^{3}$ of density and $26.98 \mathrm{~g} / \mathrm{mol}$ of atomic weight. The Avogadro's nu...

​​​​​Among the following surface hardening processes, steel is heated to the lowest temperature incarburizingcyanidingnitridingcarbonitriding

​​​​​The phases present in pearlite areaustenite and ferritecementite and austeniteferrite and cementitemartensite and ferrite

The atomic radius of a hypothetical face-centered cubic (FCC) metal is $(\sqrt{2} / 10) \; \mathrm{nm}$. The atomic weight of the metal is $24.092 \mathrm{~g} /$ mol. Tak...

Which of the following heat treatment processes is/are used for surface hardening of steels?CarburizingCyanidingAnnealingCarbonitriding

In $Fe-Fe_{3}C$ phase diagram, the eutectoid composition is $0.8$ weight $\%$ of carbon at $725^{\circ}C$. The maximum solubility of carbon in $\alpha$-ferrite phase is $...

The Cast Iron which possesses all the carbon in the combined form as cementite is known asGrey Cast IronSpheroidal Cast IronMalleable Cast IronWhite Cast Iron

The size distribution of the powder particles used in Powder Metallurgy process can be determined byLaser scatteringLaser reflectionLaser absorptionLaser penetration

The thickness, width and length of a metal slab are $\text{50 mm}$, $\text{250 mm}$ and $\text{3600 mm}$, respectively. A rolling operation on this slab reduces the thick...

Which one of the following statements about a phase diagram is INCORRECT?It indicates the temperature at which different phases start to meltRelative amount of different ...

The crystal structure of $\gamma$ iron $\text{(austenite phase)}$ is$BCC$$FCC$$HCP$$BCT$

Hardenability of steel is a measure ofthe ability to harden when it is cold workedthe maximum hardness that can be obtained when it is austenitized and then quenchedthe d...

During solidification of a pure molten metal, the grains in the casting near the mould wall arecoarse and randomly orientedfine and randomly orientedfine and orderedcoars...

A metal rod of initial length $L_0$ is subjected to a drawing process. The length of the rod at any instant is given by the expression, $L(t)=L_0(1+t^2)$ , where $t$ is t...

For a ductile material, toughness is a measure ofresistance to scratchingability to absorb energy up to fractureability to absorb energy till elastic limitresistance to i...