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You need to login to ask any Questions from chapter Definitions-and-Basic-Concepts of Heat-Transfer

Chapter:

Definitions-and-Basic-Concepts

1. What is dimension of gravity?

M L T^-2 L T^-2 M L T^-1 L T^-4

L T^-2

Unit of gravity is m/s². It is a force that attracts a body towards itself.

Hint Answer

2. How many Newton’s are re in one kg?

9.507 9.607 9.707 9.807

9.807

1 kg = 9.807 N. Newton is unit of force and kg is unit of mass.

Hint Answer

3. The resistance R experienced by a partially submerged body depends upon velocity V, length of body l, viscosity of fluid µ, density of fluid p and gravitational acceleration g. Establish a relation between involving non-dimensional groups

R = p V l² function [p V l/ µ, V/ (lg) ^1/2]. R = p l² function [p V l/ µ, V/ (lg) ^1/2]. R = V ² l² function [p V l/ µ, V/ (lg) ^1/2]. R = p V ² l function [p V l/ µ, V/ (lg) ^1/2].

R = p V ² l function [p V l/ µ, V/ (lg) ^1/2].

This can be solved by Buckingham pi orem.

Hint Answer

4. What is dimension of density?

M L ^-3 T M L ^-3 M L ^-3T ² M L ^-2

M L ^-3

Unit of density is kg/m³. It is defined as mass per unit volume.

Hint Answer

5. What is dimension of temperature?

α ^-2 α ² α M α

α

Its unit is Kelvin. It refers to how cold or hot something is.

Hint Answer

6. The principle of dimensional homogeneity serves following useful concepts
(i) It helps to check wher an equation of any physical phenomenon is dimensionally homogenous or not
(ii) It helps to determine dimensions of a physical quantity
(iii) It helps to convert units from one system to anor
Identify correct statements

i and ii ii and iii i, ii and iii ii only

i, ii and iii

It serves all aspects.

Hint Answer

7. What is dimension of work?

M L ² T^-2 M L ² T^-1 M L ² T M L ¹ T^-2

M L ² T^-2

Its unit is m N. Work can be defined as transfer of energy.

Hint Answer

8. What is dimension of kinematic viscosity?

M L ²T ^-2 L ²T ^-2 L ²T ^-1 M L ²T ^-1

L ²T ^-1

Unit of kinematic viscosity is m²/s. It is defined as dynamic viscosity per unit density.

Hint Answer

9. Which of following is not known as a core group?

Time Geometric property Fluid property Flow characteristics

Time

These are also known as repeated variables.

Hint Answer

10. The convective film coefficient in k cal/m² hr degree can be converted to J/m² s degree by multiplying it with a factor

1.1627 1.1527 1.1427 1.1327

1.1627

Both k cal/m² hr degree and J/m² s are units of convective film coefficient.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Heat-Transfer

Definitions and Basic Concepts

Definitions and Basic Concepts

Fourier Equation and Thermal Conductivity

Fourier Equation and Thermal Conductivity

Steady State Conduction

Steady State Conduction

Conduction with Heat Generation

Conduction with Heat Generation

Heat Transfer from Extended Surfaces

Heat Transfer from Extended Surfaces

Transient (Unsteady State Heat Conduction)

Transient (Unsteady State Heat Conduction)

Radiation : Processes and Properties

Radiation : Processes and Properties

Radiation : Exchange between Surfaces

Radiation : Exchange between Surfaces

Convection : Processes and Properties

Convection : Processes and Properties

Dimensional Analysis

Dimensional Analysis

Empirical Correlations for Free and Forced convection

Empirical Correlations for Free and Forced convection

Condensation and Boiling

Condensation and Boiling

Hydrodynamic and Thermal Boundary Layers

Hydrodynamic and Thermal Boundary Layers

Heat Exchangers and Mass Transfer

Heat Exchangers and Mass Transfer

Topics

This Chapter Definitions-and-Basic-Concepts consists of the following topics

Dimensional Analysis

What is dimension of gravity?

How many Newton’s are re in one kg?

The resistance R experienced by a partially submerged body depends upon velocity V, length of body l, viscosity of fluid µ, density of fluid p and gravitational acceleration g. Establish a relation between involving non-dimensional groups

What is dimension of density?

What is dimension of temperature?

The principle of dimensional homogeneity serves following useful concepts
(i) It helps to check wher an equation of any physical phenomenon is dimensionally homogenous or not
(ii) It helps to determine dimensions of a physical quantity
(iii) It helps to convert units from one system to anor
Identify correct statements

What is dimension of work?

What is dimension of kinematic viscosity?

Which of following is not known as a core group?

The convective film coefficient in k cal/m² hr degree can be converted to J/m² s degree by multiplying it with a factor

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