McqMate
Chapters
| 1. |
In a laminar flow, Reynold’s number is |
| A. | Less than 2000 |
| B. | More than 2000 |
| C. | More than 2000 but less than 4000 |
| D. | None of the above. |
| Answer» A. Less than 2000 | |
| 2. |
In a turbulent flow, Reynold’s number is |
| A. | Less than 4000 |
| B. | More than 4000 |
| C. | Between 2000 and 4000 |
| D. | None of the above. |
| Answer» B. More than 4000 | |
| 3. |
In case of a laminar flow, the loss of pressure head is |
| A. | Proportional to (velocity)2 |
| B. | Proportional to velocity |
| C. | Proportional to (velocity)1/2 |
| D. | None of the above. |
| Answer» B. Proportional to velocity | |
| 4. |
In case of a turbulent flow, the loss of head is approximately proportional to |
| A. | Velocity |
| B. | (Velocity) ^1/2 |
| C. | (Velocity) ^3/4 |
| D. | (Velocity) ^2 |
| Answer» D. (Velocity) ^2 | |
| 5. |
Darcy-Weisbach equation is used to find loss of head due to : |
| A. | Sudden enlargement |
| B. | Sudden contraction |
| C. | Friction |
| D. | None of the above. |
| Answer» C. Friction | |
| 6. |
Chezy’s formula is given as |
| A. | V = C √𝑚2 i |
| B. | V = C2 √𝑚𝑖2 |
| C. | V = C√𝑚𝑖 |
| D. | V = C √𝑚2𝑖3 |
| Answer» C. V = C√𝑚𝑖 | |
| 7. |
Loss of head due to sudden enlargement is given as |
| A. | (𝑉1−𝑉2)32𝑔 |
| B. | (𝑉1−𝑉2)22𝑔 |
| C. | (𝑉12−𝑉22)2𝑔 |
| D. | √(𝑉1−𝑉2)2𝑔 |
| Answer» B. (𝑉1−𝑉2)22𝑔 | |
| 8. |
2𝑔 148. The power transmitted through the pipe is maximum when head lost due to friction in the pipe is equal to |
| A. | (1/3) rd of the total supply head |
| B. | (1/4) th of the total supply head |
| C. | (1/5) th of the total supply head |
| D. | (1/8) th of the total supply head |
| Answer» C. (1/5) th of the total supply head | |
| 9. |
The energy loss in a pipeline is due to |
| A. | Surface roughness only |
| B. | Viscous action only |
| C. | Friction offered by pipe wall as well as by viscous function |
| D. | None of the above. |
| Answer» C. Friction offered by pipe wall as well as by viscous function | |
| 10. |
In a pipe flow the minor losses are those |
| A. | Which depend on the length of the pipeline |
| B. | Caused by friction and are thus also called friction losses. |
| C. | Which have a small magnitude |
| D. | Which are caused on account of total disturbance produced by such fittings as valves, bends, etc. |
| Answer» D. Which are caused on account of total disturbance produced by such fittings as valves, bends, etc. | |
| 11. |
In flow through pipe bends the pressures on inner and out radii |
| A. | Stand at the same level increasing gradually towards the pipe center. |
| B. | Vary, it being more on the inner core. |
| C. | Are different, pressure increases with increase in radius and is, therefore, more at the outer radius. |
| D. | Do not vary and are the same as at the center of the pipe. |
| Answer» D. Do not vary and are the same as at the center of the pipe. | |
| 12. |
The condition for maximum transmission of power through a pipeline is that one-third of the available head must be consumed in friction. The corresponding efficiency of the pipeline is |
| A. | 33·3% |
| B. | 66·67% |
| C. | 90% |
| D. | 100%. |
| Answer» B. 66·67% | |
| 13. |
For achieving continuous flow through a system, no position of the pipe should be higher than |
| A. | 20 m |
| B. | 6 m |
| C. | 7·6 m |
| D. | 10 m. |
| Answer» C. 7·6 m | |
| 14. |
For turbulent flow in smooth pipes, the entrance length is taken as |
| A. | 20 |
| B. | 50 |
| C. | 80 |
| D. | 115. |
| Answer» B. 50 | |
| 15. |
The entrance length or length of establishment of flow is |
| A. | The length in which the boundary layer remains uniform |
| B. | The pipe length inside the reservoir |
| C. | The length of pipe from its entrance in which the flow may be assumed irrotational |
| D. | The initial length in which the flow develops fully such that the velocity profile does not change downstream. |
| Answer» D. The initial length in which the flow develops fully such that the velocity profile does not change downstream. | |
| 16. |
Due to which of the following phenomena water hammer is caused? |
| A. | Incompressibility of fluid |
| B. | Sudden opening of a valve in a pipeline |
| C. | The material of the pipe being elastic |
| D. | Sudden closure (partial or complete) of a valve in pipe flow. |
| Answer» D. Sudden closure (partial or complete) of a valve in pipe flow. | |
| 17. |
Under which of the following conditions the closure of valve is considered rapid? (where L = length of pipe, C = velocity of pressure wave produced due to water hammer.) |
| A. | The duration of valve closure is greater than 2L/C |
| B. | The duration of valve closure is less than L/C |
| C. | The duration of valve closure is less than 2L/C |
| D. | None of the above. |
| Answer» C. The duration of valve closure is less than 2L/C | |
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