Civil Engineering : Fluid Machines QUESTIONS AND ANSWERS :: part3 : 1 to 5
Following Civil Engineering Multiple choice objective type questions and answers will help you in BSNL JTO, GATE 2024 and IES 2024 examinations :
1.The major loss of energy in long pipes is due to |
| sudden enlargement |
| sudden contraction |
| gradual contraction or enlargement |
| friction |
2.Separation of flow occurs when |
| the pressure intensity reaches a minimum |
| the cross-section of a channel is reduced |
| the boundary layer comes to rest |
| all of the above |
3.Which of the following statements is correct? |
| Lower critical Reynolds number is of no practical significance in pipe flow problems. |
| Upper critical Reynolds number is significant in pipe flow problems. |
| Lower critical Reynolds number has the value 2000 in pipe flow |
| Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow. |
4.The depth 'd' below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be |
| 0.423 D |
| 0.577 D |
| 0.223 D |
| 0.707 D |
5.The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is |
| 0.223 R |
| 0.423 R |
| 0.577 R |
| 0.707 R |
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