Mechanical Engineering - Hydraulics and Fluid Mechanics - Discussion

1. 

In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

[A]. equal to
[B]. one-fourth
[C]. one-third
[D]. one-half

Answer: Option B

Explanation:

No answer description available for this question.

Muhammad Saad said: (Nov 18, 2014)  
Vena contracta is the point in a fluid stream where the diameter of the stream is the least, and fluid velocity is at its maximum.

Apoorva Gupta said: (Mar 6, 2016)  
Venna is point of minimum area of stream flow, which occurs after throat due to sudden compaction and hence its diameter is less than orifice diameter.

Sanjeev said: (Jan 13, 2018)  
The distance of vena-contracta from the orifice is half the diameter of the orifice.

So, The option (D) should be correct.

.

Sujeet Kumar Prajapati said: (Aug 27, 2018)  
Option D is the correct answer.

Ram said: (Nov 17, 2018)  
D is the correct answer.

Mahesh Krishnan said: (Nov 23, 2018)  
For orifices, vena contracta occurs at 0.5D.

For mouthpiece it is D/4.

Jai Maurya said: (Jan 7, 2019)  
For external mouthpice vena contracta occurs at D/4.

For internal mouthpice vena contracta occurs at D/2.

Rajneesh Singraul said: (Feb 16, 2019)  
D is correct because this vena contracta occurs at a distance of half the diameter of orifice.

Pratik said: (Sep 14, 2019)  
It's d/2.

Ankita said: (Jul 14, 2020)  
Yes, D is the correct answer.

Vinay Bel said: (Oct 20, 2020)  
For external mouthpice vena contracta occurs at D/4.

For internal mouthpice vena contracta occurs at D/2.

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