Explore topic-wise MCQs in Heat Transfer.

This section includes 3 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.

Consider the above problem, find the reduction in heat loss if a steel screen having an emissivity value of 0.6 on both sides is placed between the brick and steel setting

A. 5.56
B. 4.46
C. 3.36
D. 2.36
Answer» E.
Discussion
2.

The furnace of a boiler is laid from fire clay brick with outside lagging from the plate steel, the distance between the two is quite small compared with the size of the furnace. The brick setting is at an average temperature of 365 K whilst the steel lagging is at 290 K. Calculate the radiant heat flux. Assume the following emissivity values
For brick = 0.85

A. nFor steel = 0.65
B. 352.9 W/m<sup>2</sup>
C. 452.9 W/m<sup>2</sup>
D. 552.9 W/m<sup>2</sup>
E. 652.9 W/m<sup>2</sup>
Answer» B. 352.9 W/m<sup>2</sup>
Discussion
3.

Two parallel square plates, each 4 m2 area, are large compared to a gap of 5 mm separating them. One plate has a temperature of 800 K and surface emissivity of 0.6, while the other has a temperature of 300 K and surface emissivity of 0.9. Find the net energy exchange by radiations between the plates

A. 61.176 k W
B. 51.176 k W
C. 41.176 k W
D. 31.176 k W
Answer» C. 41.176 k W
Discussion