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3 years ago

What is the source of vibration

2 answers:

7 0

Identifying the source of vibration by following the amplitude: the case of a company that thought the problem was a pump impeller, but, in fact, the problem was over 15-ft away and not a pump at all.

Many times we will bury ourselves in a problem looking at endless spectrums, waveforms, and machinery information in search of the source of a vibration problem, while forgetting the very basics of vibration.

Consider the following example at a large brewery. They had an unusual layout of three variable-speed pumps drawing water from a manifold system fed by two input pipes. When the production demand for water exceeded the capabilities of one pump, the second pump would be automatically started by a programmable logic control (PLC) system.

Accordingly, the two pumps would slow a bit until water demand again had both pumps running at near maximum capacity, when the third pump would kick in. Again, all three pumps would slow down to match demand. A major problem appeared when the second pump kicked in and the speed slowed. As the two pumps sped up, the vibration seemed to disappear. When the third pump kicked in and all three pumps again slowed down, the vibration was approaching 0.6-in/sec RMS.

Ber [7]3 years ago

6 0

Disturbance in configuration

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Differentiate between participative and autonomous teaching and learning

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Answer:

Participative learning is the body of the lesson, where learners are involved as actively in the learning process as possible. There is an intentional sequence of activities or learning events that will help the learner achieve the specified objective or desired outcome. However, autonomous learning is a customized way of learning applied by an individual to find out his own learning needs and learning goals, decide the most appropriate way for his own learning, as well as to monitor and evaluate the learning progress.

Explanation:

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3 years ago

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3 years ago

Choose the right name to complete each sentence. The american inventor developed the idea of interchangeable parts.

Inga [223]

Answer:

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2 years ago

Read 2 more answers

Chad has $420 to invest. the price of a stock is $6.82 per share. what is the greatest number of whole shares chad can buy?

Nezavi [6.7K]

This is an easy question. you just have to divide.
420÷6.82= 61.5
but because they are individual stocks and you can't have half a stock, you round it up to the nearest whole number
so the answer is 61
hope I helped:)

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3 years ago

A grocery store has two recycling machines

Thepotemich [5.8K]

Answer is 112%

kinda skeptical about my answer but i am going to give it my best shot, sorry if i get it wrong.

In percent-type questions I always go by this formula:

not a % %

original number : 100%

new number : new %

original number × new % = new number × 100%

here, the original numbers are 240 and 180 and the new % is +30% and -10% now let plastic be P and metal be M and let's elaborate this a bit further

plastic:

the first recycling machine took in 240 plastic bottles while the second took in 30% more plastic bottles, what we have to do here is to find out how much bottles the second machine took in as a form of integer, which is the new number; let that new number be X, let's plug this in the formula

$240:100+30\\X:130 \\$

notice: 130 is the new %

$240*130 = 100X\\31200 = 100X\\312=X$

the second machine took in 312 plastic bottles, let's save this answer for later

metal:

the first recycling machine took in 180 metal cans while the second took in 10% less plastic bottles, we do the same thing and find the new number, this time let it be Y:

$180:100-10\\Y=90$

90 is the new % here; also, notice how sometimes you either add or subtract percents, depending on what the problem demands.

$180*90=100Y\\16200=100Y\\162=Y$

Now we can conclude that the first recycling machine took in 240 plastic bottles and 180 metal cans and the second took in 312 plastic bottles and 162 metal cans.

here comes the hardest bit to apprehend and the final part of this problem, "the second machine recycled what percent (%) more items than the first?"

in other words, how much percent did the second machine recycle more.

to find that percent, first we need to add the plastic and metal "items" of both machines individually and turn them into percents: let the first machine be A and second machine be B:

A: 240+180=420

B: 312+162=474

again, using the same formula to find the new percent, let that percent be Z; plugging both A and B respectively:

$420:100\\474:Z$

$420Z=474*100\\420Z=47400\\Z= 112.857$ ≈ 112% more items than the first

now if you check the rounded up 112 and plug it back in to make sure of your answer: $420Z=47400$ you end up getting 47040, since it's rounded up, but when you plug the full 112.857 you get 47399.94, closest to 47400. Tip: when you plug in any value for check up, don't use the rounded up one.

At last, those steps are actually fast, especially with that formula it's so important. the explanation seems intimidating so read it slowly and take your time. if you have any other questions, feel free to ask. also, let me know if you know a faster method to solve this question. <3

4 0

3 years ago