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.

A black body of total area 0.045 m2 is completely enclosed in a space bounded by 5 cm thick walls. The walls have a surface area 0.5 m 2 and thermal conductivity 1.07 W/ m K. If the inner surface of the enveloping wall is to be maintained at 215 degree Celsius and the outer wall surface at 30 degree Celsius, calculate the temperature of the black body

A. 547.3 K
B. 287.4 K
C. 955.9 K
D. 222.2 K
Answer» D. 222.2 K
Discussion
2.

Measurements were made of the monochromatic absorptivity and monochromatic hemispherical irradiation incident on an opaque surface, and the variation of these parameters with wavelength may be approximated by the result shown below. Determine the total hemispherical absorptivity

A. 0.557
B. 0.667
C. 0.777
D. 0.887
Answer» C. 0.777
Discussion
3.

If the emitted radiant energy is to be doubled, to what temperature surface of black body needs to be raised? Take radiant flux density as 11631.7 W/m 2.

A. 894.4 K
B. 200.4 K
C. 800.3 K
D. 600.4 K
Answer» E.
Discussion