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Test: Heat Transfer By Forced Convection - 1 - Chemical Engineering MCQ


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10 Questions MCQ Test - Test: Heat Transfer By Forced Convection - 1

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Test: Heat Transfer By Forced Convection - 1 - Question 1

Match the following List-l (Dimensionless number) with List-ll (Physical interpretation). 
List-l
A. Drag coefficient
B. Eckert number
C. Colburn j factor
D. Fourier number

List-ll
1. Dimensionless heat transfer coefficient
2. Ratio of shear stress to free stream kinetic energy
3. Dimensionless time
4. Kinetic energy of flow relative to boundary- layer enthalpy difference

Test: Heat Transfer By Forced Convection - 1 - Question 2

Which of the following dimensionless number/parameter is different from others?

Detailed Solution for Test: Heat Transfer By Forced Convection - 1 - Question 2

(b), (c) and (d) are dimensionless heat transfer coefficient

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Test: Heat Transfer By Forced Convection - 1 - Question 3

Match List-l with List-ll
List-l
A. Reynolds number
B. Prandtl number
C. Nusselt number
D. Mach number

List-lI
1. Film coefficient, pipe diameter, thermal conductivity
2. Flow velocity, acoustic velocity
3. Heat capacity, dynamic viscosity, thermal conductivity
4. Flow velocity, pipe diameter, kinematic viscosity

Test: Heat Transfer By Forced Convection - 1 - Question 4

Stanton number may be interpreted as the ratio of

Test: Heat Transfer By Forced Convection - 1 - Question 5

The Nusselt number is related to Reynolds number in laminar and turbulent flows respectively as

Detailed Solution for Test: Heat Transfer By Forced Convection - 1 - Question 5

Nu = C Re0.5 Pr0.33 (for laminar flow) Nu = C Re0.8 Pr0.33 (for turbulent flow)

Test: Heat Transfer By Forced Convection - 1 - Question 6

For turbulent flow over a flat plate, the average value of Nusselt number is prescribed by the relation

Which of the followings is then a false statement? The average heat transfer coefficient increase as

Detailed Solution for Test: Heat Transfer By Forced Convection - 1 - Question 6


∴ h2 decreases as 1/5 power of plate length.

Test: Heat Transfer By Forced Convection - 1 - Question 7

Reynolds analogy states that

Test: Heat Transfer By Forced Convection - 1 - Question 8

The flow and heat transfer in coiled tubes are governed by

Detailed Solution for Test: Heat Transfer By Forced Convection - 1 - Question 8

The flow and heat transfer in coiled tubes are governed by Dean number,


Where D is tube diameter
dc is coil diameter

Test: Heat Transfer By Forced Convection - 1 - Question 9

Which one of the following is flow properly

Detailed Solution for Test: Heat Transfer By Forced Convection - 1 - Question 9

Reynolds number is flow property depends on velocity of flow. It is not the property of fluid.

Test: Heat Transfer By Forced Convection - 1 - Question 10

For a fluid having Prandtl number equal to unity how are the hydrodynamic boundary layer thickness δ and the thermal boundary layer thickness δt related

Detailed Solution for Test: Heat Transfer By Forced Convection - 1 - Question 10


Where,
δt = Thickness of Thermal boundary layer
δ = Thickness of hydrodynamic boundary layer

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