Convection Heat Transfer - MCQs with Answers

Convection Heat Transfer – MCQs with Answers

1. In convection heat transfer energy transfer takes place between

a. two solid surfaces connected physically
b. solid surface and fluid system in motion
c. both a. and b.
d. none of the above

ANSWER: b. solid surface and fluid system in motion

2. What is the correct formula for the rate of heat transfer (q) from a surface of body of the area A to the surrounding fluid, when surface of the body is at temperature Ts and the surrounding fluid is at temperature T?

a. q = k A (Ts – T)
b. q = h A (Ts – T)
c. q = (h/k) A (Ts – T)
d. q = (1/h) A (Ts – T)

Where,
k = conductivity of the body
h = coefficient of convection

ANSWER: b. q = h A (Ts – T)

3. The convection heat transfer coefficient depends upon

a. the thermal properties of fluid
b. geometry of the system
c. characteristics of the fluid flow
d. all of the above

ANSWER: d. all of the above

4. In a process of heat transfer by convection from a body to the surrounding fluid, the convection heat transfer coefficient

a. remains constant over the entire surface of the body
b. does not remain constant over the entire surface of the body
c. none of the above

ANSWER: b. does not remain constant over the entire surface of the body

5. Which two processes are unitedly responsible in the transfer of heat between solid surface and surrounding fluid?

a. conduction and convection
b. conduction and mass transfer
c. convection and mass transfer
d. none of the above

ANSWER: b. conduction and mass transfer

6. When the surface of a body is at higher temperature than the surrounding fluid, then the heat flows firstly from surface of the body to the adjacent layer of fluid by

a. convection
b. conduction