3 years ago

Which of the following is NOT true about drawings and specifications?

Engineering

1 answer:

hoa [83]3 years ago

3 0

Answer:

sorry but we can't tell the answer because your not showing the drawings and specifications.

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As a means of preventing ice formation on the wings of a small, private aircraft, it is proposed that electric resistance heatin

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Average heat flux=3729.82 W/ $m^{2}$

Explanation:

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Name three types of large motor vehicles with which you might share the roadway. Explain how you can reduce risk when interactin

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rucks, buses, RVs, trolleys

Explanation:

What are some different types of vehicles that we share the road with?

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4. From two permeability tests it is found that the void ratio and hydraulic conductivity of a normally consolidated clay are 1.

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Explanation:

Check attachment for solution

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A completely reversible heat pump produces heat at a rate of 300 kW to warm a house maintained at 24 °C. The exterior air, which

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Answer:

No.

Explanation:

The Coefficient of Performance of the reversible heat pump is determined by the Carnot's cycle:

$COP_{HP} = \frac{T_{H}}{T_{H}-T_{L}}$

$COP_{HP} = \frac{297.15\,K}{297.15\,K-280.15\,K}$

$COP_{HP} = 3.339$

The power required to make the heat pump working is:

$\dot W = \frac{300\,kW}{3.339}$

$\dot W = 89.847\,kW$

The heat absorbed from the exterior air is:

$\dot Q_{L} = 300\,kW - 89.847\,kW$

$\dot Q_{L} = 210.153\,kW$

According to the Second Law of Thermodynamics, the entropy generation rate in a reversible cycle must be zero. The formula for the heat pump is:

$\frac{\dot Q_{L}}{T_{L}} - \frac{\dot Q_{H}}{T_{H}} + \dot S_{gen} = 0$

$\dot S_{gen} = \frac{\dot Q_{H}}{T_{H}} - \frac{\dot Q_{L}}{T_{L}}$

$\dot S_{gen} = \frac{300\,kW}{297.15\,K}-\frac{210.153\,kW}{280.15\,K}$

$\dot S_{gen} = 0.259\,\frac{kW}{K}$

Which contradicts the reversibility criterion according to the Second Law of Thermodynamics.

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Answer:

True.

Explanation:

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