A Flow Test
Feb 23, 2019 10:51:44 #
It has to be #3. Tanks 4, 5, 6 are blocked. Tank 2 would never fill because it drains into 7 which has a hole in the bottom.
Feb 23, 2019 11:11:16 #
Feb 23, 2019 11:17:04 #
patman1 wrote:
5 is not blocked!
Actually it is. The pipe draining into it is closed.
Feb 23, 2019 15:51:46 #
jerryc41 wrote:
It looks simple, and it actually is. : )
Look closely at the circled areas that show the various problems whether blockages or hole.
It clearly shows that three is the only one that will actually fill.
Feb 23, 2019 20:12:14 #
chikid68 wrote:
Look closely at the circled areas that show the various problems whether blockages or hole.
It clearly shows that three is the only one that will actually fill.
It clearly shows that three is the only one that will actually fill.
It is a flawed question. Yes, given a slow enough flow, and the diagram does show a drip, the only tank that will fill is 3 and then it will overflow.
In a fast flow situation 3 would begin filling and potentially the level in 1 would rise so that water would also be directed to 2. It is also possible that with a significant flow, one that exceeded the discharge rate of both outlets of tank 1, 1 might fill before 3. Again, the diagram does show a drip.
If the outlets from 1 to 3 and 1 to 2 are equal in area, the outflow to 3 will be greater because the static head at that outlet will be greater.
Eventually 3 with no real outlet will overflow and if water flow is strong enough to put water to 2, it will fill up to the level of it's discharge.
Since it appears the fill and discharge flow for 2 are equal in size, no matter what the flow is into 2, 2 will never fill. It is possible under the right flow conditions for 7 to fill since the hole appears to be small in relationship to its inlet, but it would take a flow rate into 1 that can not be completely discharged via the outlet to three.
Feb 23, 2019 21:38:10 #
InfiniteISO wrote:
It is a flawed question. Yes, given a slow enough... (show quote)
The diagram shows just a drip, indicating to me that it would be just a very slow flow, not a fast flow.
Feb 24, 2019 05:51:43 #
Feb 24, 2019 05:56:14 #
I'm sorry I took so long to post the correct answer, but it's #3.
When #1 starts to fill, it will flow left into #3. the outlet to #4 is blocked, and the pipe running to #5 is blocked.
After #3 fills, water will backup into #1, which will let water run into #2 and then #7, which has a hole in the bottom.
As chikid68 said, only #3 will fill.
When #1 starts to fill, it will flow left into #3. the outlet to #4 is blocked, and the pipe running to #5 is blocked.
After #3 fills, water will backup into #1, which will let water run into #2 and then #7, which has a hole in the bottom.
As chikid68 said, only #3 will fill.
Feb 24, 2019 08:30:58 #
jerryc41 wrote:
After #3 fills, water will backup into #1, which will let water run into #2 and then #7, which has a hole in the bottom.
After #3 fills, water will backup into #1, which will let water run into #2 and then #7, which has a hole in the bottom.
I'm sorry, but no. The only way water backs up into 1 to where it can discharge to 2 is if the flow rate into 1 exceeds the rate that can be lost through the discharge pipe to 3. And if that's the case, this "backing up" will occur before 3 gets full.
3 is an open top vessel. Liquid rising to the point where the fill pipe to 3 is sealed does will not keep additional water from flowing into 3 and overflowing. A simple simulation of this can be seen when drinking from a straw. When you quit sucking on a straw the liquid in the straw levels out with the glass even though it is sealed at the bottom by that same liquid. Water coming down the inlet pipe to 3 when it is sealed by the level of 3 will just displace water already in 3 and make it overflow.
Feb 24, 2019 09:00:56 #
This questions reminds me of an employment screening test our HR department used to give our prospective process operators.
At a meeting years ago the current HR person (they seem to come and go like the wind) stated that no one had ever aced the mechanical reasoning test we gave to screen our work candidates. Seeing a fun challenge the engineering department begged to take the test. It was something like 50 multiple choice questions and you were allotted a set time to complete it. When the engineers took it we did well, all of us scoring above 90%, but none of us got a perfect score. As it happened, the HR person mentioned that three of us had only missed two questions and for each of us they were the same two. Of course we demanded to see which questions they were and the answer key.
I can only remember one of the questions completely now. I know the one I can't remember had to do with gear system rotations and obviously had the wrong answer in the key. Stuff like that happens on standardized tests.
The now infamous question had two sketches, one sketch had a small jet powered helicopter sitting on a lunar surface. It had 2 blades in the rotor. The second sketch had a large jet powered helicopter sitting in the same location and this one had two, 4-bladed rotors at each end. The question read: "which helicopter will work best on the moon?" the answers were: a) the small helicopter, b) the large helicopter, c) they would both work equally well.
The engineers in our group, seeing as how there is no real atmosphere on the moon for the rotors to generate lift or provide oxygen to the jet engines picked answer c, thinking both not working at all was indeed "equally well". The answer key said the large helo was correct.
At a meeting years ago the current HR person (they seem to come and go like the wind) stated that no one had ever aced the mechanical reasoning test we gave to screen our work candidates. Seeing a fun challenge the engineering department begged to take the test. It was something like 50 multiple choice questions and you were allotted a set time to complete it. When the engineers took it we did well, all of us scoring above 90%, but none of us got a perfect score. As it happened, the HR person mentioned that three of us had only missed two questions and for each of us they were the same two. Of course we demanded to see which questions they were and the answer key.
I can only remember one of the questions completely now. I know the one I can't remember had to do with gear system rotations and obviously had the wrong answer in the key. Stuff like that happens on standardized tests.
The now infamous question had two sketches, one sketch had a small jet powered helicopter sitting on a lunar surface. It had 2 blades in the rotor. The second sketch had a large jet powered helicopter sitting in the same location and this one had two, 4-bladed rotors at each end. The question read: "which helicopter will work best on the moon?" the answers were: a) the small helicopter, b) the large helicopter, c) they would both work equally well.
The engineers in our group, seeing as how there is no real atmosphere on the moon for the rotors to generate lift or provide oxygen to the jet engines picked answer c, thinking both not working at all was indeed "equally well". The answer key said the large helo was correct.
Feb 24, 2019 09:20:30 #
jerryc41 wrote:
I'm sorry I took so long to post the correct answer, but it's #3.
When #1 starts to fill, it will flow left into #3. the outlet to #4 is blocked, and the pipe running to #5 is blocked.
After #3 fills, water will backup into #1, which will let water run into #2 and then #7, which has a hole in the bottom.
As chikid68 said, only #3 will fill.
When #1 starts to fill, it will flow left into #3. the outlet to #4 is blocked, and the pipe running to #5 is blocked.
After #3 fills, water will backup into #1, which will let water run into #2 and then #7, which has a hole in the bottom.
As chikid68 said, only #3 will fill.
Flawed test. Not enough info to tell. Yes with a low flow from the faucet, #3 would fill first. But let’s say the faucet flow is ten times the gravity flow to #3 and #2. In that case, #1 would fill first.
Feb 24, 2019 09:24:33 #
GregWCIL wrote:
Flawed test. Not enough info to tell. Yes with a low flow from the faucet, #3 would fill first. But let’s say the faucet flow is ten times the gravity flow to #3 and #2. In that case, #1 would fill first.
The graphic depicts water dripping out of the signot. I think you have to base it on that.
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