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Chapter:

Dimensional-and-Model-Analysis

1. If 200m³ of fluid has a weight of 1060N measured on planet having acceleration due to gravity 6.625m/s2, what will be it’s specific volume?

0.8 0.7 0.9 0.5

0.8

Specific weight=Weight/volume
= (Mass*acceleration due to gravity)/volume
=density*acceleration due to gravity
=1/(specific volume *acceleration due to gravity)
Specific volume=1060/(200*6.625).

Hint Answer

2. Which one of following is dimension of mass density?

[M¹ L^-3 T⁰]. [M¹ L³ T⁰]. [M⁰ L^-3 T⁰]. [M⁰ L³ T⁰].

[M¹ L^-3 T⁰].

Mass Density(p) is defined as mass(m) per unit volume(V ), i.e.,
[p] = [m]/[v] = [m] /[L³] = [ML^-3].

Hint Answer

3. Which one of following is correct relation between compressibility β and Bulk Modulus k

β = k β = 1/k β = 2k β = k/2

β = 1/k

Compressibility ? of a liquid is de?ned as ratio of volumetric strain to compressive stress while Bulk Modulus is ratio of compressive stress to volumetric strain. Hence, ? = 1/k is correct relation.

Hint Answer

4. In which types of fluids it is observed that momentum transfer dominates cohesive forces with increase in temperature and hence viscosity increases

Gases Liquids Solids None of the mentioned

Gases

It is characteristic property of gases which show increase in viscosity with increase in temperature.

Hint Answer

5. The value of surface tension of an ideal fluid is

zero unity infinity more than that of a real fluid

zero

Ideal fluids haze zero surface tension but real fluids have some finite value of surface tension.

Hint Answer

6. For a compressible fluid kinematic viscosity is affected by temperature and pressure variation.

True False

True

Viscosity shows variation for change in temperature and pressure for compressible fluids. Hence, kinematic viscosity is affected by temperature and pressure variation.

Hint Answer

7. Which one of following is not a unit of dynamic viscosity?

Pa-s N-s/m² Poise Stokes

Stokes

$Which one of following is not a unit of dynamic viscosity?\r\n$

where F= viscous force, A= area, du ? dx = velocity gradient, ? = co-effcient of viscosity. Therefore,

Hint Answer

8. Which of following is a unit of kinematic viscosity?

Stokes Pa-s m2=s Poise

Stokes

? = ?/?, where ? = kinematic viscosity, ? = dynamic viscosity and ? = density of fluid. Unit of ? is dyne-s/cm² and that of ? is kg/cm³.
Thus, unit of ? is cm²/s = Stokes Poise is unit of dynamic viscosity.
1 Poise = 1 dyne-s/cm²

$Which of following is a unit of kinematic viscosity?\r\n$

Hint Answer

9. Determine compressibility of an incompressible fluid, if pressure of fluid is changed from 70 N/m² to 130 N/m². The volume of liquid changes by 0.15 percent.

0.0025 m²/N 0.0050 m²/N 0.0070 m²/N 0.0012 m²/N

0.0025 m²/N

Compressibility=1/Bulk Modulus
=1/K
K=(dp*V/dv)
=60/0.15
=400
Compressibility=.0025.

Hint Answer

10. The value of gas constant is same for all gases

True False

False

The value of gas constant depends on molecular weight. As molecular weight is different, gas constant will be different.

Hint Answer

Nexttt

All Chapters

View all Chapter and number of question available From each chapter from Fluid-Mechanics-Mcqs

Properties of Fluids

Properties of Fluids

Pressure and Its Measurement

Pressure and Its Measurement

Hydrostatic Forces on Surfaces

Hydrostatic Forces on Surfaces

Buoyancy and Floatation

Buoyancy and Floatation

Kinematics of Flow and Ideal Flow

Kinematics of Flow and Ideal Flow

Fluid Dynamics

Orifices, Mouthpieces, Notches and Weirs

Orifices, Mouthpieces, Notches and Weirs

Viscous Flow & Turbulent Flow

Viscous Flow & Turbulent Flow

Flow Through Pipes

Flow Through Pipes

Indicator Diagrams

Indicator Diagrams

Dimensional and Model Analysis

Dimensional and Model Analysis

Boundary Layer Flow & Forces on Sub-merged Bodies

Boundary Layer Flow & Forces on Sub-merged Bodies

Compressible Flow

Compressible Flow

Flow in Open Channels

Flow in Open Channels

Non Uniform Flow in Channels

Non Uniform Flow in Channels

Impact of Jets and Jet Propulsion

Impact of Jets and Jet Propulsion

Topics

This Chapter Dimensional-and-Model-Analysis consists of the following topics

Properties of Fluids

If 200m³ of fluid has a weight of 1060N measured on planet having acceleration due to gravity 6.625m/s2, what will be it’s specific volume?

Which one of following is dimension of mass density?

Which one of following is correct relation between compressibility β and Bulk Modulus k

In which types of fluids it is observed that momentum transfer dominates cohesive forces with increase in temperature and hence viscosity increases

The value of surface tension of an ideal fluid is

For a compressible fluid kinematic viscosity is affected by temperature and pressure variation.

Which one of following is not a unit of dynamic viscosity?

Which of following is a unit of kinematic viscosity?

Determine compressibility of an incompressible fluid, if pressure of fluid is changed from 70 N/m² to 130 N/m². The volume of liquid changes by 0.15 percent.

The value of gas constant is same for all gases

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