2 years ago

Which of the following about valence electron is correct?

Engineering

2 answers:

olga nikolaevna [1]2 years ago

5 0

What is the answer choices?

kotykmax [81]2 years ago

3 0

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While recharging a refrigerant system, the charging stops before the required amount of refrigerant has been inserted. What shou

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Answer C

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That is the correct way.

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3 years ago

Select three types of engineering that involve work in inaccessible environments.

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Chemical Engineer,Geological Engineer,Aerospace Engineer

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Windmills slow the air and cause it to fill a larger channel as it passes through the blades. Consider a circular windmill with

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Answer:

DIAMETER = 9.797 m

POWER = $\dot W = 28.6 kW$

Explanation:

Given data:

circular windmill diamter D1 = 8m

v1 = 12 m/s

wind speed = 8 m/s

we know that specific volume is given as

$v =\frac{RT}{P}$

where v is specific volume of air

considering air pressure is 100 kPa and temperature 20 degree celcius

$v = \frac{0.287\times 293}{100}$

v = 0.8409 m^3/ kg

from continuity equation

$A_1 V_1 = A_2 V_2$

$\frac{\pi}{4}D_1^2 V_1 = \frac{\pi}{4}D_1^2 V_2$

$D_2 = D_1 \sqrt{\frac{V_1}{V_2}}$

$D_2 = 8 \times \sqrt{\frac{12}{8}}$

$D_2 = 9.797 m$

mass flow rate is given as

$\dot m = \frac{A_1 V_1}{v} = \frac{\pi 8^2\times 12}{4\times 0.8049}$

$\dot m = 717.309 kg/s$

the power produced $\dot W = \dot m \frac{ V_1^2 - V_2^2}{2} = 717.3009 [\frac{12^2 - 8^2}{2} \times \frac{1 kJ/kg}{1000 m^2/s^2}]$

$\dot W = 28.6 kW$

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3 years ago

Distinguish between systems analysis and systems design?

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System analysis can be defined as a deep analysis of a part of the structure of a module that has been designed before. System design means to make any module or a part of the structure from scratch and build it completely without estimation.

Explanation:

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Any change in the system from one equilibrium state to another is called: A) Path B) Process C) Cycle D) None of the above

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Answer:

B) Process

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In thermodynamics a process is a passage of a thermodynamic system from an initial to a final state of thermodynamic equilibrium.

A thermodynamic process path is the series of states through which a system passes from an initial to a final state.

Cycle is a process in which initial and final state are identical.

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3 years ago