McqMate
Chapters
| 1. |
The motion of fluid particles may be described by which of the following methods? |
| A. | Langrangian method |
| B. | Eulerain method |
| C. | Both (a) and (b) |
| D. | None of the above. |
| Answer» C. Both (a) and (b) | |
| 2. |
In which of the following methods, the observer concentrates on a point in the fluid system? |
| A. | Langrangian method |
| B. | Eulerian method |
| C. | Any of the above |
| D. | None of the above. |
| Answer» D. None of the above. | |
| 3. |
Normal acceleration in fluid-flow situation exists only when |
| A. | The flow is unsteady |
| B. | The flow is two-dimensional |
| C. | The streamlines are straight and parallel |
| D. | The streamlines are curved. |
| Answer» B. The flow is two-dimensional | |
| 4. |
In a steady flow the velocity |
| A. | Does not change from place to place |
| B. | At a given point does not change with time |
| C. | May change its direction but the magnitude remains unchanged |
| D. | None of the above. |
| Answer» B. At a given point does not change with time | |
| 5. |
The flow in a pipe whose valve is being opened or closed gradually is an example of |
| A. | Steady flow |
| B. | Unsteady flow |
| C. | Rotational flow |
| D. | Compressible flow. |
| Answer» B. Unsteady flow | |
| 6. |
The type of flow in which the velocity at any given time does not change with respect to space is called |
| A. | Steady flow |
| B. | Compressible flow |
| C. | Uniform flow |
| D. | Rotational flow. |
| Answer» C. Uniform flow | |
| 7. |
Flow in a pipe where average flow parameters are considered for analysis is an example of |
| A. | Incompressible flow |
| B. | One-dimensional flow |
| C. | Two-dimensional flow |
| D. | Three-dimensional flow. |
| Answer» B. One-dimensional flow | |
| 8. |
The flow in a river during the period of heavy rainfall is |
| A. | Steady, non-uniform and three-dimensional |
| B. | Steady, uniform, two-dimensional |
| C. | Unsteady, uniform, three-dimensional |
| D. | Unsteady, non-uniform and three-dimensional. |
| Answer» D. Unsteady, non-uniform and three-dimensional. | |
| 9. |
Flow between parallel plates of infinite extent is an example of |
| A. | One-dimensional flow |
| B. | Two-dimensional flow |
| C. | Three-dimensional flow |
| D. | Compressible flow. |
| Answer» B. Two-dimensional flow | |
| 10. |
If the flow is irrational as well as steady it is known as |
| A. | Non-uniform flow |
| B. | One-dimensional flow |
| C. | Potential flow |
| D. | None of the above. |
| Answer» C. Potential flow | |
| 11. |
High velocity flow in a conduit of large size is known as |
| A. | Laminar flow |
| B. | Turbulent flow |
| C. | Either of the above |
| D. | None of the above. |
| Answer» B. Turbulent flow | |
| 12. |
If the Reynolds number is less than 2000, the flow in a pipe is |
| A. | Laminar flow |
| B. | Turbulent flow |
| C. | Transition flow |
| D. | None of the above. |
| Answer» A. Laminar flow | |
| 13. |
The path followed by fluid particle in motion is called a |
| A. | Streamline |
| B. | Path line |
| C. | Streak line |
| D. | None of the above. |
| Answer» B. Path line | |
| 14. |
A....is an imaginary line within the flow so that the tangent at any point on it indicates the velocity at that point. |
| A. | Streak line |
| B. | Stream line |
| C. | Path line |
| D. | None of the above. |
| Answer» B. Stream line | |
| 15. |
A stream line is one |
| A. | In which stream function does not change |
| B. | In which the flow cannot cross the bounding surface |
| C. | Which has a constant area throughout its length so that the velocity remains constant. |
| D. | None of the above. |
| Answer» B. In which the flow cannot cross the bounding surface | |
| 16. |
...... is a curve which gives an instantaneous picture of the location of the fluid particles which have passed through a given point. |
| A. | Path line |
| B. | Stream line |
| C. | Streak line |
| D. | None of the above. |
| Answer» C. Streak line | |
| 17. |
In fluid mechanics, the continuity equation is a mathematical statement embodying the principle of |
| A. | Conservation of momentum |
| B. | Conservation of mass |
| C. | Conservation of energy |
| D. | None of the above. |
| Answer» B. Conservation of mass | |
| 18. |
An irrational flow is one in which |
| A. | The stream lines of flow are curved and closely spaced |
| B. | The fluid does not rotate as it moves along |
| C. | The net rotation of fluid particles about their mass centres remains zero |
| D. | None of the above. |
| Answer» C. The net rotation of fluid particles about their mass centres remains zero | |
| 19. |
In a fluid-flow the stream lines are lines |
| A. | Along which the vorticity is zero |
| B. | Along which the stream function ψ = constant |
| C. | Which are parallel to the equipotential lines |
| D. | Which exist in irrotional flow only. |
| Answer» B. Along which the stream function ψ = constant | |
| 20. |
....... is defined mathematically as the line integral of the tangential velocity about a closed path (contour). |
| A. | Circulation |
| B. | Vorticity |
| C. | Either of the above |
| D. | None of the above. |
| Answer» A. Circulation | |
| 21. |
The concept of stream function which is based on the principle of continuity is applicable to |
| A. | Irrotational flow only |
| B. | Two-dimensional flow only |
| C. | Three-dimensional flow |
| D. | Uniform flow only. |
| Answer» B. Two-dimensional flow only | |
| 22. |
The motion is described as ......when the components of rotation or vorticity are zero throughout certain point of the fluid. |
| A. | Rotational |
| B. | Irrotational |
| C. | Either of the above |
| D. | None of the above. |
| Answer» B. Irrotational | |
| 23. |
........ is defined as a scalar function of space and time such that its negative derivative with respect to any direction gives the fluid velocity in that direction. |
| A. | Velocity potential function |
| B. | Stream function |
| C. | Circulation |
| D. | Vorticity. |
| Answer» A. Velocity potential function | |
| 24. |
If velocity potential (φ) satisfies the Laplace equation, it represents the possible..... flow. |
| A. | Unsteady, compressible, rotational |
| B. | Steady, compressible, irrotational |
| C. | Unsteady, incompressible, rotational |
| D. | Steady, incompressible, irrotational. |
| Answer» D. Steady, incompressible, irrotational. | |
| 25. |
A flow net is a graphical representation of strea lines and equipotential lines such that these lines |
| A. | Intersect each other orthogonally forming curvilinear squares |
| B. | Intersect each other at various different angles forming irregular-shaped nets |
| C. | Indicate the direction and magnitude of vector |
| D. | None of the above. |
| Answer» A. Intersect each other orthogonally forming curvilinear squares | |
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