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Ivan
3 years ago
5

Could I get some help please!.

Engineering
2 answers:
sertanlavr [38]3 years ago
5 0

Answer:

Chipping; cutting; drilling; grinding

Explanation:

Activities such as abrasive blasting with sand; sawing brick or concrete; sanding or drilling into concrete walls; grinding mortar; manufacturing brick, concrete blocks, stone countertops, or ceramic products; and cutting or crushing stone result in worker exposures to respirable crystalline silica dust.

RUDIKE [14]3 years ago
3 0

Answer:

In construction, workers can be easily exposed to silica when using rock containing silica or concrete and masonry products that contain silica sand when preforming such tasks as chipping, hammering, drilling, crushing, or hauling rock; preforming abrasive blasting; and sawing, hammering, drilling, and sweeping.

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Dimensional analysis: a)-Can be used to derive equations and non-dimensional numbers. b)-Helps in planning experiments. c)-Is an
iris [78.8K]

Answer:

Option e)

Explanation:

Dimensional Analysis helps in the analysis of relationship between physical quantities, checking its dimension thus checking the accuracy of a given or to find the dimensions of a quantity or the degree of correctness of an equation.

Dimensional analysis has some of the applications that are listed below:

  • To establish a relationship between physical quantities
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8 0
3 years ago
A 450 MWt combined cycle plant has a Brayton cycle efficiency of 24% and a Rankine cycle efficiency of 29% with no heat augmenta
Romashka-Z-Leto [24]

Answer:

Output of plant=207.18 MW

Explanation:

Given input energy Q=450 MW

Brayton cycle efficiency\eta_1=24%

Rankine cycle efficiency \eta_2=29%

Combined efficiency for two cycle given as follow

\eta _b=\eta _1+\eta _2-\eta _1\eta _2

\eta _b=0.24+0.29-0.24\times 0.29

\eta_b=0.4604

We know that efficiency \eta =\dfrac{out\ put}{in\ put}

out put of plant=450\times 0.4604

So output of plant=207.18 MW

4 0
3 years ago
g a heat engine is located between thermal reservoirs at 400k and 1600k. the heat engine operates with an efficiency that is 70%
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Answer:

<em>Heat rejected to cold body = 3.81 kJ</em>

Explanation:

Temperature of hot thermal reservoir Th = 1600 K

Temperature of cold thermal reservoir Tc = 400 K

<em>efficiency of the Carnot's engine = 1 - </em>\frac{Tc}{Th}<em> </em>

eff. of the Carnot's engine = 1 - \frac{400}{600}

eff = 1 - 0.25 = 0.75

<em>efficiency of the heat engine = 70% of 0.75 = 0.525</em>

work done by heat engine = 2 kJ

<em>eff. of heat engine is gotten as = W/Q</em>

where W = work done by heat engine

Q = heat rejected by heat engine to lower temperature reservoir

from the equation, we can derive that

heat rejected Q = W/eff = 2/0.525 = <em>3.81 kJ</em>

6 0
3 years ago
Hãy trình bày sự hiểu biết của bạn về đo dòng điện
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Answer:

-Khái niệm:

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a. Theo nguyên lý làm việc

Dụng cụ đo kiểu điện từ

Dụng cụ đo kiểu điện động

Dụng cụ đo kiểu cảm ứng

Dụng cụ đo kiểu từ điện

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+Đo điện áp: Ví dụ: Vôn kế

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