Heat And Mass Transfer MCQ Questions & Answers | Mechanical Engineering

A. Convection

B. Radiation

C. Conduction

D. Both convection and conduction

A. Minimum energy

B. Maximum energy

C. Both (A) and (B)

D. None of these

A. Nature of body

B. Temperature of body

C. Type of surface of body

D. All of the above

A. $${\text{Q}} = \frac{{2\pi l{\text{k}}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{2.3\log \left( {\frac{{{{\text{r}}_2}}}{{{{\text{r}}_1}}}} \right)}}$$

B. $${\text{Q}} = \frac{{2.3\log \left( {\frac{{{r_2}}}{{{r_1}}}} \right)}}{{2\pi l{\text{k}}\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}$$

C. $${\text{Q}} = \frac{{2\pi \left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)}}{{2.3l{\text{k}}\log \left( {\frac{{{{\text{r}}_2}}}{{{{\text{r}}_1}}}} \right)}}$$

D. $${\text{Q}} = \frac{{2\pi l{\text{k}}}}{{2.3\left( {{{\text{T}}_1} - {{\text{T}}_2}} \right)\log \left( {\frac{{{{\text{r}}_2}}}{{{{\text{r}}_1}}}} \right)}}$$

A. $${\text{h}} = \frac{{\text{k}}}{{\rho {\text{S}}}}$$

B. $${\text{h}} = \frac{{\rho {\text{S}}}}{{\text{k}}}$$

C. $${\text{h}} = \frac{{\text{S}}}{{\rho {\text{k}}}}$$

D. $${\text{h}} = \frac{{\rho {\text{k}}}}{{\text{S}}}$$

A. Steam

B. Solid ice

C. Melting ice

D. Water

A. Aluminium

B. Steel

C. Brass

D. Copper

A. Density

B. Coefficient of viscosity

C. Gravitational force

D. All of these

A. k/h₀

B. 2k/h₀

C. h₀/k

D. h₀/2k

A. K cal/kg m² °C

B. K cal m/hr m² °C

C. K cal/hr m² °C

D. K calm/hr °C