a. change in velocity of a fluid

b. change in density of a fluid

c. change in molecular structure of a fluid

d. none of the above

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**ANSWER: b. change in density of a fluid**

a. convection forces

b. fluid forces

c. body forces

d. none of the above

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**ANSWER: c. body forces**

a. more than the intensity of mixing of fluid in forced convection

b. less than the intensity of mixing of fluid in forced convection

c. equal to the intensity of mixing of fluid in forced convection

d. unpredictable

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**ANSWER: b. less than the intensity of mixing of fluid in forced convection**

a. convection heat transfer coefficient of natural convection is lower than the convection heat transfer coefficient of forced convection

b. convection heat transfer coefficient of natural convection is more than the convection heat transfer coefficient of forced convection

c. convection heat transfer coefficients in both natural and forced convection are the same for same system

d. unpredictable

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**ANSWER: a. convection heat transfer coefficient of natural convection is lower than the convection heat transfer coefficient of forced convection**

What is the relation between the upward velocity of the fluid and the distance from the bottom of the plate, when plate is hotter that fluid?

a. as the distance from the bottom of the plate increases, the upward velocity of the fluid near the plate surface decreases

b. as the distance from the bottom of the plate increases, the upward velocity of the fluid near the plate surface increases

c. the upward velocity of the fluid near the plate surface is same all over the plate

d. unpredictable

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**ANSWER: b. as the distance from the bottom of the plate increases, the upward velocity of the fluid near the plate surface increases**

a. At the bottom of the plate

b. At the middle of the plate

c. At the top of the plate

d. Nowhere

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**ANSWER: c. At the top of the plate**

a. Plate temperature is lower than the fluid temperature

b. Plate temperature is higher than the fluid temperature

c. Plate temperature is equal to the fluid temperature

d. unpredictable

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**ANSWER: b. Plate temperature is higher than the fluid temperature**

**RE: Natural Convection and Forced Convection – 1 – MCQs with Answers -ant (10/23/16)**- isn't the fluid that hits the plate should be colder?

the fact that fluid sinks, otherwise if the plate is hotter, the fluid will rise

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