Test: Heat Transfer By Forced Convection - 1


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


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Attempt Test: Heat Transfer By Forced Convection - 1 | 10 questions in 30 minutes | Mock test for Chemical Engineering preparation | Free important questions MCQ to study Heat Transfer for Chemical Engineering Exam | Download free PDF with solutions
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

Solution:
QUESTION: 2

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

Solution:

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

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

Solution:
QUESTION: 4

Stanton number may be interpreted as the ratio of

Solution:
QUESTION: 5

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

Solution:

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

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

Solution:


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

QUESTION: 7

Reynolds analogy states that

Solution:
QUESTION: 8

The flow and heat transfer in coiled tubes are governed by

Solution:

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


Where D is tube diameter
dc is coil diameter

QUESTION: 9

Which one of the following is flow properly

Solution:

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

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

Solution:


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

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