Heat and Mass Transfer

Heat and Mass Transfer

University

15 Qs

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Heat and Mass Transfer

Heat and Mass Transfer

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Vikram Chavan

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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What is the correct formula for the rate of heat transfer (q) through a plane wall of thickness L and surface are A, when temperature difference between two surfaces is ΔT ? The thermal conductivity is k.

q = (k A ΔT) / L

q = k A L ΔT

q = (ΔT) / (k A l)

none of the above

2.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Thermal conductivity of the same material varies with

a. the thickness of the material

b. the temperature of the material

C. both a. and b.

d. thermal conductivity of the same martial does not vary at all

3.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What does a composite wall mean?

two walls of different materials are connected in series without any gap between them

three walls of different materials are connected in series without any gap between them

more than three walls of different materials are connected in series without any gap between them

all of the above

4.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

When a composite wall of three layers in series having thermal resistances R1, R2 and R3 respectively. The heat transfer takes place normal to the surface of the layers. How is the total thermal resistance of the composite system calculated?

1 / (R1 + R2 + R3)

((1 / R1) + (1 / R2) + (1 / R3) )

(R1 + R2 + R3)

none of the above

5.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

What is the formula for the thermal resistance (R) of a hollow cylinder of internal radius Ri, outer radius Ro and the length l ? Thermal conductivity of the cylinder material is k. The heat flows from inner side to outer side.

R = ln (Ro / Ri) / 2πkl

R = ln (Ri / Ro) / 2πkl

R = (Ro + Ri) / 2πkl

R = (RoRi) / 2πkl

6.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

At the critical radius of insulation of a hollow sphere, the heat transfer will be

minimum

maximum

does not change

unpredictable

7.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The critical radius of a hollow sphere having thermal conductivity k and ho as convective heat transfer coefficient of outer fluid is given by

ho / k

k / ho

2k / ho

ho / 2k

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