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

This section includes 5 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.

Suppose heat is conducted due to electrons

A. Where, i = I/A and p is the resistivity, then
B. q g = 2i2 p
C. q g = 3i2 p
D. q g = i2 p
E. q g = 4i2 p
Answer» D. q g = i2 p
Discussion
2.

The rear window of an automobile is made of thick glass i.e. AB = 5 mm and thermal conductivity is 0.8 W/m degree. To defrost this window, a thin transparent film type heating element has been fixed to its inner surface. For the conditions given below, determine the electric power that must be provided per unit area of window if a temperature 5 degree Celsius is maintained at its outer surface. Interior air temperature and the corresponding surface coefficient are 20 degree Celsius and 12 W/m2 degree. Surrounding air temperature and the corresponding surface coefficient are – 15 degree Celsius and 70 W/m2 degree. Electric heater provides uniform heat flux

A. 232.5 /m2
B. 1232.5 /m2
C. 2232.5 /m2
D. 3232.5 /m2
Answer» C. 2232.5 /m2
Discussion
3.

Consider a slab of thickness δ with one side (x = 0) insulated and other side (x = δ) maintained at constant temperature. The rate of uniform heat generation within the slab is q g W/m3. Presuming that the heat conduction is in steady state and one dimensional along x direction, the maximum temperature in the slab would occur at x equal

A. δ/2
B. Zero
C. δ/4
D. δ
Answer» C. δ/4
Discussion
4.

For a plane wall of thickness l with uniformly distributed heat generation q g per unit volume, the temperature t 0 at mid plane is given by

A. t 0 = q g l 2/2k +t w
B. t 0 = q g l 2/4k +t w
C. t 0 = q g l 2/8k +t w
D. t 0 = q g l 2/16k +t w
Answer» D. t 0 = q g l 2/16k +t w
Discussion
5.

If Q X is heat generated in at distance ‘x’, then heat conducted out at a distance (x + d x) will be

A. Q X + 3d (Q X) d x /d x
B. 2Q X + d (Q X) d x /d x
C. d (Q X) d x /d x
D. Q X + d (Q X) d x /d x
Answer» E.
Discussion