Heat And Mass Transfer MCQ Questions & Answers | Mechanical Engineering

A. Solids

B. Liquids

C. Gases

D. None of these

A. Absolute temperature

B. Square of the absolute temperature

C. Cube of the absolute temperature

D. Fourth power of the absolute temperature

A. Free electrons

B. Atoms colliding frequency

C. Low density

D. Porous body

A. Face area

B. Time

C. Thickness

D. Temperature difference

A. Increases

B. Decreases

C. Remain constant

D. May increase or decrease depending on temperature

A. $${\text{Q}} = \frac{{2\pi {\text{k}}{{\text{r}}_1}{{\text{r}}_2}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{{{\text{r}}_2} - {{\text{r}}_1}}}$$

B. $${\text{Q}} = \frac{{4\pi {\text{k}}{{\text{r}}_1}{{\text{r}}_2}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{{{\text{r}}_2} - {{\text{r}}_1}}}$$

C. $${\text{Q}} = \frac{{6\pi {\text{k}}{{\text{r}}_1}{{\text{r}}_2}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{{{\text{r}}_2} - {{\text{r}}_1}}}$$

D. $${\text{Q}} = \frac{{8\pi {\text{k}}{{\text{r}}_1}{{\text{r}}_2}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{{{\text{r}}_2} - {{\text{r}}_1}}}$$

A. Kirchhoff’s law

B. Stefan’s law

C. Wine’s law

D. Planck’s law

A. Wien’s law

B. Planck's law

C. Stefan's law

D. Fourier's law

A. Equal to one

B. Greater than one

C. Less than one

D. Equal to Nusselt number

A. 0

B. 0.5

C. 0.75

D. 1