Explore topic-wise MCQs in Heat Transfer Questions and Answers.

This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Heat Transfer Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.

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
2.

Determine the net radiant heat exchange per m 2 area for two infinite parallel plates held at temperature of 800 K and 500 K. Take emissivity as 0.6 for the hot plate and 0.4 for the cold plate

A. 6200 W/m2
B. 7200 W/m2
C. 8200 W/m2
D. 9200 W/m2
Answer» B. 7200 W/m2
Discussion
3.

Two large parallel planes with emissivity 0.4 are maintained at different temperatures and exchange heat only by radiation. What percentage change in net radiative heat transfer would occur if two equally large radiation shields with surface emissivity 0.04 are introduced in parallel to the plates?

A. 65.1%
B. 75.1%
C. 85.1%
D. 95.1%
Answer» E.
Discussion