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This mock test of Test: Heat Transfer By Forced Convection - 2 for Chemical Engineering helps you for every Chemical Engineering entrance exam.
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QUESTION: 1

The non-dimensional parameter known as Stanton number (St) is used in

Solution:

QUESTION: 2

Nusselt number in case of forced convection is the function of

Solution:

For forced convection

Nu - f(Re, Pr)

QUESTION: 3

For laminar flow in a tube for constant heat flux condition Nusselt number is approximately equal to

Solution:

QUESTION: 4

For laminar flow in a tube for constant wall temperature Nusselt number is approximately equal to

Solution:

QUESTION: 5

If Nusselt number is 400, Stanton number is 0.5 and Reynold’s number is 40, then Prandtl number will be

Solution:

QUESTION: 6

The velocity and temperature distribution in a pipe flow are given by U(r) and T(r). If u_{m} is the mean velocity at any section of the pipe, the mean temperature at that section is

Solution:

QUESTION: 7

A fluid flowing over aflat plate has the following properties:

Dynamic viscosity = 25 x 10^{-6} kg/ms

Specific heat = 2 kJ/kgK

Thermal conductivity = 0.05 W/mK

The hydrodynamic boundary layer thickness found to be 0.5 mm. The thickness of thermal boundary layer would be

Solution:

Hence

QUESTION: 8

For a laminar flow of air (Pr = 0.71) over a flat plate at zero incidence, the thickness of the velocity boundary layer δ and the hydrodynamic boundary layer δ_{t} are such that

Solution:

Since,

QUESTION: 9

Heat is lost from a 100 mm diameter steam pipe placed horizontally in ambient at 30°C. If the Nusseit number is 25 and thermal conductivity of air is 0.03 W/mK then the heat transfer coefficient will be

Solution:

or

QUESTION: 10

Heat transfer coefficients for free convection in gases, forced convection in gases and vapours and for boiling water lie respectively in the range of

Solution:

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