1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
nasty-shy [4]
3 years ago
10

A process involves the removal of oil and other liquid contaminants from metal parts using a heat-treat oven, which has a volume

of 15,000 ft3. The oven is free of solvent vapors. The ventilation rate of the oven is 2,100 cfm, and the safety factor (K) is 3. The solvent used in the process evaporates at a rate of 0.6 cfm (cubic feet per minute). The operator would like to know how long it would take the concentration to reach 425 ppm.
Engineering
1 answer:
Aleks [24]3 years ago
7 0

Answer:

time = 4.89 min

Explanation:

given data

volume = 15,000 ft³

ventilation rate of oven = 2,100 cubic feet per minute

safety factor (K) = 3

evaporates at a rate = 0.6 cubic feet per minute

solution

we get here first solvent additional rate in oven that is

solvent additional rate = \frac{0.6}{1500}

solvent additional rate = 4 × 10^{-5} min

solvent additional rate == 4 × 10^{-5} × 10^{6}

solvent additional rate =  40 ppm/min

and

solvent removal rate due to ventilation will be

removal rate = \frac{2100}{1500} × concentration in ppm

removal rate = 0.14 C  ppm/min

and

net additional rate is

net additional rate (c) = m - r

so net additional rate (c) is = 40 - 0.14C

so here

\frac{dc}{dt} = 40 - 0.14C

so take integrate from 0 to t

\int\limits^t_o {dt} = \int\limits^{425/3}_0 \frac{dc}{40-0.14C}    ....................1

here factor of safety is 3 so time taken is \frac{425}{3}  

solve it we get

time = [\frac{-50}{7} \ log(40-\frac{7c}{50}  ]^{425/3} _0

time = 4.89 min

You might be interested in
Compare a series circuit powered by six 1.5-volt batteries to a series circuit powered by a single 9-volt battery. Make sure the
lana [24]

Answer:

Both series circuits provide a total voltage of 9 volts to the two bulbs connected in series and the voltage will be equally divided among two bulbs and they will have same brightness. Therefore, both circuits will have same characteristics.

Explanation:

We are asked to compare two series circuits having equal number of light bulbs.

1st circuit is powered by 6 batteries each having a voltage of 1.5V

2nd circuit is powered by a single battery having a voltage of 9V.

The six batteries in the 1st circuit can be connected together in series or in parallel.

When the batteries are connected in series (positive terminal of one battery connected to negative terminal of another battery) their voltage gets added which means

Voltage of pack = number of batteries*voltage of each battery

Voltage of pack = 6*1.5

Voltage of pack = 9 volts

But the current remains same in the series connection since there is only path for the current to flow.

On the other hand, when the batteries are connected in parallel, the voltage remains same but the current increases.

Circuit 1:

In this circuit, we have 6 batteries each of 1.5 volts connected in series to provide a voltage of 9 volts.

We have connected 2 bulbs in this series circuit.

The voltage will be equally divided between two bulbs if both bulbs are identical in construction.

So there will be 4.5 volts across each bulb and both bulbs will have same brightness.

Circuit 2:

In this circuit, we have 1 battery which provide a voltage of 9 volts.

We have connected 2 bulbs in this series circuit just like in circuit 1.

The voltage will be equally divided between two bulbs if both bulbs are identical in construction.

So there will be 4.5 volts across each bulb and both bulbs will have same brightness.

Conclusion:

Both series circuits provide a total voltage of 9 volts to the two bulbs connected in series and the voltage will be equally divided among two bulbs and they will have same brightness. Therefore, both circuits will have same characteristics.

3 0
3 years ago
Explain why Chloe's design needs to be redone in the following scenario, and recommend the techniques she needs to include in he
Alenkinab [10]

Answer:

She believes he's weak and won't do what needs to be done to become a king.

Explanation:

She says ('I fear thy nature') and calls him 'too full o' th' milk of human kindness' which reflects that she feels his kindness makes him weak and may prevent him from proceeding the plan. Thus, she manipulates him to keep his kindness aside and do what she wishes him to do. She rather belittles him to get her purpose solved and

7 0
3 years ago
Read 2 more answers
About ceramics: Only can be optically opaque or semi-transparent. a) True b)-False
julia-pushkina [17]

Answer: True

Explanation: Ceramics have the property that when the band gap present between the atoms are larger than the light energy then the tend to become opaque because the light scattering is caused . They also show the property of being translucent when there are chances of the light to get a path through the surface of ceramic so they get the light at some parts e.g.porcelain .Therefore the statement given is true that ceramics can be optically opaque or semi-transparent(translucent).

6 0
3 years ago
An 1,840 W toaster, a 1,420 W electric frying pan, and a 70 W lamp are plugged into the same outlet in a 15 A, 120 V circuit. (T
Viktor [21]

Answer:

A)

Current drawn by toaster = 15.33 A

Current drawn by electric frying pan = 11.83 A

Current drawn by lamp = 0.58 A

B)

The fuse will definitely blow up since the current drawn by three devices (27.74 A) is way higher than 15 A fuse rating.

Explanation:

There are three devices plugged into the same outlet.

Toaster = 1840 W

Electric frying pan = 1420 W

Lamp = 70 W

Since the three devices are connected in parallel therefore, the voltage across them will be same but the current drawn by each will be different.

A) What current is drawn by each device?

The current flowing through the device is given by

I = P/V

Where P is the power and V is the voltage.

Current drawn by toaster:

I = 1840/120

I = 15.33 A

Current drawn by electric frying pan:

I = 1420/120

I = 11.83 A

Current drawn by lamp:

I = 70/120

I = 0.58 A

B) Will this combination blow the 15-A fuse?

The total current drawn by all three devices is

Total current = 15.33 + 11.83 + 0.58

Total current = 27.74 A

Therefore, the fuse will definitely blow up since the current drawn by three devices (27.74 A) is way higher than 15 A fuse rating.

5 0
3 years ago
Systematic searching is a skill that takes ________ to master.
bagirrra123 [75]

Answer: B, repetitive practice! hope this helps. :)

Explanation:

7 0
3 years ago
Read 2 more answers
Other questions:
  • Heat in the amount of 100 kJ is transferred directly from a hot reservoir at 1200 K to a cold reservoir at 600 K. Calculate the
    15·1 answer
  • Valves on steam lines are commonly encountered and you should know how they work. For most valves, the change in velocity of the
    10·1 answer
  • Give the approximate temperature at which creep deformation becomes an important consideration for each of the following metals:
    5·1 answer
  • Considering the two tables below called Orders and OrderLines, how many rows would be returned by this SQL query? SELECT o.Order
    10·1 answer
  • What is the line called that has the red arrow pointing to it in the attached picture?
    6·1 answer
  • Pleaseeee help me with this!!
    10·1 answer
  • What is Join..?? Explain different types of joins.
    10·1 answer
  • If an internally piloted DCV does not shift, you should use a gauge to _____. A.check the pilot line pressure b. check the inlet
    15·1 answer
  • A high compression ratio may result in;
    13·1 answer
  • determine the position d of the 6- kn load so that the average normal stress in each rod is the same.
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!