Convection MCQs : This section focuses on the "Convection" in Heat Transfer. These Multiple Choice Questions (MCQs) should be practiced to improve the Heat Transfer skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
Which of the following is true about Convection?
A. Convection is the process of heat transfer in fluids by the actual motion of matter
B. It happens in liquids and gases
C. It may be natural or forced
D. All of the above
Question 2
How many types of convection there?
A. 1
B. 2
C. 3
D. 4
Question 3
Forced convection is related to Newton’s law of cooling
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
Question 4
oceanic winds is an example of?
A. Forced convection
B. Natural convection
C. Both A and B
D. None of the above
Question 5
Which of the following heat flow situations pertains to free or natural convection?
A. Air conditioning installations and nuclear reactors
B. Flow of water inside the condenser tubes
C. Cooling of internal combustion engine
D. Cooling of billets in atmosphere
Question 6
Mark the system where heat transfer is given by forced convection
A. Chilling effect of cold wind on warm body
B. Fluid passing through the tubes of a condenser and other heat exchange equipment
C. Heat flow from a hot pavement to surrounding atmosphere
D. Heat exchange on the outside of cold and warm pipes
Question 7
Which of the following is an Convection Examples?
A. Sea breeze
B. Land Breeze
C. Both A and B
D. None of the above
Question 8
Forced convection in a liquid bath is caused by
A. Intense stirring by an external agency
B. Molecular energy interactions
C. Density difference brought about by temperature gradients
D. Flow of electrons in a random fashion
Question 9
Examples of forced convection are using water heaters or geysers for instant heating of water.
A. TRUE
B. FALSE
C. Can be true or false
D. Can not say
Question 10
The convective heat transfer coefficient in laminar flow over a flat plate
A. Increases with distance
B. Increases if a higher viscosity fluid is used
C. Increases if a denser fluid is used
D. Decreases with increase in free stream velocity