McqMate
Chapters
| 1. |
Dimensional analysis is used to |
| A. | Test the dimensional homogeneity of any equation of fluid motion |
| B. | Derive rational formulae for a flow phenomenon |
| C. | Derive equations expressed in terms of non– dimensional parameters |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 2. |
Which of the following is an advantage of dimensional analysis? |
| A. | It expresses the functional relationship between the variables in dimensionless terms |
| B. | In hydraulic model studies it reduces the number of variables involved in a physical phenomenon, generally by three |
| C. | By the use of dimensional analysis design curves can be developed from experimental data or direct solution of the problem |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 3. |
dimensionally homogeneous equation is applicable to |
| A. | C.G.S. system only |
| B. | F.P.S. system only |
| C. | M.K.S. and SI systems |
| D. | All systems of units. |
| Answer» D. All systems of units. | |
| 4. |
In which of the following methods of dimensional analysis, a functional relationship of some variables is expressed in the form of an exponential equation, which must be dimensionally homogeneous? |
| A. | Buckingham’s π-method |
| B. | Rayleigh’s method |
| C. | Bridgman’s method |
| D. | Matrix–tensor method. |
| Answer» B. Rayleigh’s method | |
| 5. |
In dimensional analysis the Buckingham’s π–theorem is widely used and expresses the resulting equation in terms of |
| A. | The repeating variables |
| B. | Geometric, kinematic and dynamic variables |
| C. | (n – m) dimensionless parameters |
| D. | n dimensionless parameters. |
| Answer» C. (n – m) dimensionless parameters | |
| 6. |
To apply Buckingham’s π–theorem, m repeating variables are selected from amongst the n variables influencing the phenomenon. The repeating variables are selected such that they |
| A. | Belong to kinematic and dynamic category of variables |
| B. | Must always contain the dependent variables |
| C. | In combination contain each of the m fundamental dimensions involved in the problem. |
| D. | None of the above. |
| Answer» C. In combination contain each of the m fundamental dimensions involved in the problem. | |
| 7. |
In order that results obtained in model studies correctly represent the behaviour of the prototype, which of the following similarities must be ensured between the model and the prototype? |
| A. | Geometric similarity |
| B. | Kinematic similarity |
| C. | Dynamic similarity |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 8. |
Dynamic similarity between the model and prototype is the |
| A. | Similarity of motion |
| B. | Similarity of lengths |
| C. | Similarity of forces |
| D. | None of the above. |
| Answer» C. Similarity of forces | |
| 9. |
...... is equal to the product of shear stress due to viscosity and surface area of flow. |
| A. | Viscous force |
| B. | Inertia force |
| C. | Pressure force |
| D. | Gravity force. |
| Answer» A. Viscous force | |
| 10. |
Kinematic similarity between model and prototype is the |
| A. | Similarity of discharge |
| B. | Similarity of shape |
| C. | Similarity of streamline pattern |
| D. | None of the above. |
| Answer» C. Similarity of streamline pattern | |
| 11. |
......... is the ratio of the inertia force to the viscous force. |
| A. | Froude’s number |
| B. | Weber’s number |
| C. | Reynolds number |
| D. | Mach’s number. |
| Answer» C. Reynolds number | |
| 12. |
........ is the square root of the ratio of the inertia force to the pressure force. |
| A. | Reynolds number |
| B. | Mach’s number |
| C. | Euler’s number |
| D. | Froude’s number. |
| Answer» C. Euler’s number | |
| 13. |
Euler number is important in which of the following flow situations? |
| A. | Discharge through orifices, mouthpieces and sluices |
| B. | Pressure rise due to sudden closure of valves |
| C. | Flow through pipes |
| D. | All of the above |
| Answer» D. All of the above | |
| 14. |
Mach’s number is defined as the square root of the ratio of the |
| A. | Inertia force to the pressure force |
| B. | Inertia force to the surface tension force |
| C. | Inertia force to the elastic force |
| D. | None of the above. |
| Answer» C. Inertia force to the elastic force | |
| 15. |
...... is important in compressible fluid flow problems at high velocities, such as high velocity flow in pipes or motion of high-speed projectiles and missiles. |
| A. | Euler’s number |
| B. | Mach’s number |
| C. | Reynolds number |
| D. | Froude’s number. |
| Answer» B. Mach’s number | |
| 16. |
Distorted models are required to be prepared for which of the following? |
| A. | Rivers |
| B. | Dams across very wide rivers |
| C. | Harbours |
| D. | All of the above. |
| Answer» D. All of the above. | |
| 17. |
The scale effect in models can be |
| A. | Positive only |
| B. | Negative only |
| C. | Both positive and negative |
| D. | None of the above. |
| Answer» C. Both positive and negative | |
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