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This mock test of Test: Heat Transfer By Forced Convection - 1 for Chemical Engineering helps you for every Chemical Engineering entrance exam.
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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 Re^{0.5} Pr^{0.33} (for laminar flow) Nu = C Re^{0.8} Pr^{0.33} (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:

∴ h_{2} 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

d_{c} 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 δ_{t} related

Solution:

Where,

δ_{t} = Thickness of Thermal boundary layer

δ = Thickness of hydrodynamic boundary layer

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