Exercise ::
Convection : Processes And Properties
1. How many types of fluid flow are characterized in the realms of fluid mechanics?
A. 2 B. 4 C. 6 D. 8
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Answer: Option A
Explanation:
There are two types of flow i.e.

Laminar flow
Turbulent flow
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2. In which fluid flow, the motion of fluid particles is irregular?
A. Two dimensional B. One dimensional C. Laminar D. Turbulent
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Answer: Option D
Explanation:
It proceeds along erratic and unpredictable paths.

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3. The value of convective coefficient of air in case of free convection is?
A. 9-9.5 W/m^{2} K B. 8-9 W/m^{2} K C. 3-4 W/m^{2} K D. 3-7 W/m^{2} K
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Answer: Option D
Explanation:
In case of air, the value of convective coefficient is small i.e. 3 W/m^{2} K to 7 W/m^{2} K. This is due to presence of some moisture in air.

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4. The fluid particles move in flat or curved un-mixing layers or streams and follow a smooth continuous path. This type of flow is known as?
A. Laminar flow B. Turbulent flow C. Stream flow D. Steady flow
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Answer: Option A
Explanation:
The paths of fluid movement are well defined so it is laminar flow.

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5. The characteristic dimension d in the relation R _{E} = V d p/δ is the equivalent diameter and is defined as how many times the cross-sectional flow area divided by the wetted perimeter
A. 4 B. 6 C. 8 D. 10
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Answer: Option A
Explanation:
It is defined as four times the equivalent diameter and is defined as how many times the cross-sectional flow area divided by wetted perimeter.

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