Explore topic-wise MCQs in Heat Transfer.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer knowledge and support exam preparation. Choose a topic below to get started.

1.

The correlation for liquid metal is given by

A. Nu = 0.465 (Re) (Pr)
B. Nu = 0.565 (Re) (Pr)
C. Nu = 0.665 (Re) (Pr)
D. Nu = 0.765 (Re) (Pr)
Answer» C. Nu = 0.665 (Re) (Pr)
Discussion
2.

The local film coefficient for laminar flow past a flat plate may be obtained from the correlation

A. Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.33</sup>
B. Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.43</sup>
C. Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.53</sup>
D. Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.63</sup>
Answer» B. Nu = 0.332 (Re) <sup>0.5</sup> (Pr) <sup>0.43</sup>
Discussion
3.

A horizontal heated plate at 200 degree Celsius and facing upwards has been placed in still air at 20 degree Celsius. If the plate measures 1.25 m by 1 m, make calculations for the heat loss by natural convection. The convective film coefficient for free convection is given by the following empirical relation
h = 0.32 ( ) 0.25 W/m2 K

A. nWhere is the mean film temperature in degrees kelvin
B. 6006 W
C. 5006 W
D. 4006 W
E. 3006 W
Answer» B. 6006 W
Discussion
4.

The Nusselt number is related to Reynolds number in laminar and turbulent flows respectively as

A. R <sub>e</sub><sup>-1/2 </sup>and R <sub>e</sub><sup>0.8</sup>
B. R <sub>e</sub><sup>1/2 </sup>and R <sub>e</sub><sup>0.8</sup>
C. R <sub>e</sub><sup>-1/2 </sup>and R <sub>e</sub><sup>-0.8</sup>
D. R <sub>e</sub><sup>1/2 </sup>and R <sub>e</sub><sup>-0.8</sup>
Answer» C. R <sub>e</sub><sup>-1/2 </sup>and R <sub>e</sub><sup>-0.8</sup>
Discussion