velocity ratio help (1 Viewer)

[cloud edwards]

Anyone know how the answer. I have no clue how to do it. I also don't have the answer =(

 

[mattskioner]

Okay so the VR formula for hydraulics systems is D^2/d^2, where D is the output diameter and d is the input diameter. So if you sub the values in, you should get 6.25, which is then rounded to 6.3 (D)

 

[OkDen]

Okay so the VR formula for hydraulics systems is D^2/d^2, where D is the output diameter and d is the input diameter. So if you sub the values in, you should get 6.25, which is then rounded to 6.3 (D)

I'm not an engineering studies student but:

Isn't 6.3 the velocity ratio of a 100% efficient hydraulic system?

So, is it 5.3 = (6.25 * 0.85) ---- (C)
or 6.3 (D)

 

[mattskioner]

I'm not an engineering studies student but:

Isn't 6.3 the velocity ratio of a 100% efficient hydraulic system?

So, is it 5.3 = (6.25 * 0.85) ---- (C)
or 6.3 (D)

It's one of those questions where they give you more information than you need. The formula for efficiency is MA/VR, so if the question asks what is the MA of the system, then it would be C as 6.3 X 85%=~5.3. But it's simply asking for the VR, so it's just D^2/d^2

 

[OkDen]

It's one of those questions where they give you more information than you need. The formula for efficiency is MA/VR, so if the question asks what is the MA of the system, then it would be C as 6.3 X 85%=~5.3. But it's simply asking for the VR, so it's just D^2/d^2

ok thx

 

[cloud edwards]

Thanks guys for your help =)

 

[mattskioner]

Thanks guys for your help =)

You're welcome, any other questions, just post