Explore topic-wise MCQs in Heat Transfer.

This section includes 5 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.

What is the unit of coefficient of radiant heat transfer?

A. W/K
B. W/m<sup>2</sup> K
C. W/m<sup>2</sup>
D. W/m K
Answer» C. W/m<sup>2</sup>
Discussion
2.

A cylindrical cavity of base diameter 15 cm and height 20 cm has inside surface temperature 650 K. If emissivity of each surface is 0.85, determine the net radiative heat transfer from the cavity

A. 194 W
B. 184 W
C. 174 W
D. 164 W
Answer» D. 164 W
Discussion
3.

A conical cavity of base diameter 15 cm and height 20 cm has inside surface temperature 650 K. If emissivity of each surface is 0.85, determine the net radiative heat transfer from the cavity

A. 168.3 W
B. 158.3 W
C. 148.3 W
D. 138.3 W
Answer» B. 158.3 W
Discussion
4.

Heat exchange between two gray surfaces enclosed by an adiabatic surface is given by

A. Q <sub>12</sub> = A (T<sub> 1</sub><sup>4 </sup> T <sub>2</sub><sup>4</sup>) / [1/E <sub>1</sub> + 1/E<sub> 2</sub> 2 + 2/1 + F <sub>12</sub>].
B. Q <sub>12</sub> = A <sub>b</sub> (T<sub> 1</sub><sup>4 </sup> T <sub>2</sub><sup>4</sup>) / [1/E <sub>1</sub> + 1/E<sub> 2</sub> + 2/1 + F <sub>12</sub>].
C. Q <sub>12</sub> = A <sub>b</sub> (T<sub> 1</sub><sup>4 </sup> T <sub>2</sub><sup>4</sup>) / [1/E <sub>1</sub> + 1/E<sub> 2</sub> 2 + 2/1 + F <sub>12</sub>].
D. Q <sub>12</sub> = A <sub>b</sub> (T<sub> 1</sub><sup>4 </sup> T <sub>2</sub><sup>4</sup>) / [1/E <sub>1</sub> + 1/E<sub> 2</sub> 2].
Answer» D. Q <sub>12</sub> = A <sub>b</sub> (T<sub> 1</sub><sup>4 </sup> T <sub>2</sub><sup>4</sup>) / [1/E <sub>1</sub> + 1/E<sub> 2</sub> 2].
Discussion
5.

Two black discs each of diameter 50 cm are placed parallel to each other concentrically at a distance of one meter. The discs are maintained at 1000 K and 500 K. Calculate the heat flow between the discs when no other surface is present

A. 317.27 W
B. 417.27 W
C. 517.27 W
D. 617.27 W
Answer» C. 517.27 W
Discussion