Let us say thermal conductivity of a wall is governed by the relation k = k0 (1 + t). In that case the temperature at the mid-plane of the heat conducting wall would be

Less than average of the temperature at the wall faces

Av. of the temperature at the wall faces

More than average of the temperature at the wall faces

Less than average of the temperature at the wall faces

Depends upon the temperature difference between the wall faces

Explore topic-wise MCQs in Heat Transfer.

This section includes 6 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.	A composite wall of a furnace has two layers of equal thickness having thermal conductivities in the ratio 2:3. What is the ratio of the temperature drop across the two layers?
A.	2:3
B.	3:2
C.	1:2
D.	log <sub>e </sub>2 : log <sub>e </sub>3
Answer» C. 1:2

Discussion

2.	A composite slab has two layers having thermal conductivities in the ratio of 1:2. If the thickness is the same for each layer then the equivalent thermal conductivity of the slab would be
A.	1/3
B.	2/3
C.	2
D.	4/3
Answer» E.

Discussion

3.	Radiation cannot be affected through vacuum or space devoid of any matter . True or false
A.	True
B.	False
Answer» C.

Discussion

4.	Heat is transferred from a hot fluid to a cold one through a plane wall of thickness ( ), surface area (A) and thermal conductivity (k). The thermal resistance is
A.	1/A (1/h<sub>1</sub> + /k + 1/h<sub>2</sub>)
B.	A (1/h<sub>1</sub> + /k + 1/h<sub>2</sub>)
C.	1/A (h<sub>1</sub> + /k + h<sub>2</sub>)
D.	A (h<sub>1</sub> + /k + 1/h<sub>2</sub>)
Answer» B. A (1/h<sub>1</sub> + /k + 1/h<sub>2</sub>)

Discussion

5.	Let us say thermal conductivity of a wall is governed by the relation k = k₀(1 + t). In that case the temperature at the mid-plane of the heat conducting wall would be
A.	Av. of the temperature at the wall faces
B.	More than average of the temperature at the wall faces
C.	Less than average of the temperature at the wall faces
D.	Depends upon the temperature difference between the wall faces
Answer» C. Less than average of the temperature at the wall faces

Discussion

6.	A composite wall is made of two layers of thickness ₁ and ₂ having thermal conductivities k and 2k and equal surface area normal to the direction of heat flow. The outer surface of composite wall are at 100 degree Celsius and 200 degree Celsius. The minimum surface temperature at the junction is 150 degree Celsius. What will be the ratio of wall thickness?
A.	1:1
B.	2:1
C.	1:2
D.	2:3
Answer» D. 2:3

Discussion

Explore topic-wise MCQs in Heat Transfer.

A composite wall of a furnace has two layers of equal thickness having thermal conductivities in the ratio 2:3. What is the ratio of the temperature drop across the two layers?

A composite slab has two layers having thermal conductivities in the ratio of 1:2. If the thickness is the same for each layer then the equivalent thermal conductivity of the slab would be

Radiation cannot be affected through vacuum or space devoid of any matter . True or false

Heat is transferred from a hot fluid to a cold one through a plane wall of thickness ( ), surface area (A) and thermal conductivity (k). The thermal resistance is

Let us say thermal conductivity of a wall is governed by the relation k = k0 (1 + t). In that case the temperature at the mid-plane of the heat conducting wall would be

Let us say thermal conductivity of a wall is governed by the relation k = k₀(1 + t). In that case the temperature at the mid-plane of the heat conducting wall would be