SECTION-4

#### HEAT AND MASS TRANSFER MCQ

##### Q1.  Sensible heat is the heat required to

(a) change vapour into liquid

(b) change liquid into vapour

(c) increase the temperature of a liquid of vapour

(d) convert water into steam and superheat it

Ans: (c) increase the temperature of a liquid of vapour

##### Q2. Heat transfer in liquid and gases takes place by

(a) conduction

(b) convection

(d) conduction and convection

Ans: (b) convection

##### Q3. Thermal conductivity of air with rise in temperature

(a) increases

(b) decreases

(c) remains constant

(d) may increase or decrease depending on temperature

Ans: (a) increases

(a) glass

(b) water

(c) plastic

(d) air.

Ans: (d) air.

##### Q5. Thermal conductivity of a material may be defined as the

(a) quantity of heat flowing in one second through one cm cube of material when opposite faces are maintained at a temperature difference of 1°C

(b) quantity of heat flowing in one second through a slab of the material of area one cm square, thickness 1 cm when its faces differ in temperature by 1°C

(c) heat conducted in unit time across unit area through unit thickness when a temperature difference of unity is maintained between opposite faces

(d) all of the above

Ans:(d) all of the above

##### Q6. Heat transfer takes place by the process of

(a) conduction
(b) convection
(d) all of the above.

Ans:(d) all of the above.

##### Q7. The heat transfer takes place according to

(a) first law of thermodynamics
(b) Zeroth law of thermodynamics
(c) second law of thermodynamics
(d) Fourier’s law.

Ans:(c) second law of thermodynamics

##### Q8. The basic law of heat conduction is called

(a) Newton’s law of cooling
(b) Fourier’s law
(c) Kirchhoff’s law
(d) Stefan’s law.

Ans:(b) Fourier’s law

##### Q9. The rate of heat transfer from a solid surface to a fluid is obtained from

(a) Newton’s law of cooling
(b) Fourier’s law
(c) Kirchhoff’s law
(d) Stefan’s law.

Ans:(a) Newton’s law of cooling

##### Q10. Fourier’s law is based on assumption that

(a) heat flow through a solid is one-dimensional
(b) heat flow is in steady-state
(c) both (a) and (b)
(d) none of the above.

Ans:(c) both (a) and (b)

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##### Read More Sections of Heat Transfer and Mass Transfer

Each section contains maximum 80 Questions. To practice more questions visit other sections.

Heat and Mass Transfer, RAC  MCQ – Section-1

Heat and Mass Transfer, RAC  MCQ – Section-2

Heat and Mass Transfer, RAC  MCQ – Section-3

Heat and Mass Transfer, RAC  MCQ – Section-4