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hram777
2 months ago
7

5 kg of steam contained within a piston-cylinder assembly undergoes an expansion from state 1, where the specific internal energ

y is u1 = 2709.9 kJ/kg, to state 2, where u2 = 2659.6 kJ/kg.
During the process, there is heat transfer to the steam with a magnitude of 80 kJ. Also, a paddle wheel transfers energy to the steam by work in the amount of 18.5 kJ.
There is no significant change in the kinetic or potential energy of the steam.
Determine the energy transfer by work from the steam to the piston during the process, in kJ.
Engineering
1 answer:
Daniel [329]2 months ago
4 0

Answer:

Energy Transfer = 350 kJ

Explanation:

The net work can be derived from the energy balance equation. Thus, we have:

∆KE + ∆PE + ∆U = Q − W

Where

∆KE = ∆PE = 0 (Since there’s no notable change in either kinetic or potential energy of the steam)

Net work comprises the work done by the paddlewheel, Wpw,

and the work on the piston, Wpiston:

W = Wpw + Wpiston

From the data provided, Wpw = −18.5 kJ,

Summarizing results:

Wpw + Wpiston = Q − ∆U

Wpiston = Q − ∆U − Wpw = Q − m (u2 − u1) − Wpw

Where Q = 80 kJ, m = 5 kg, u2 = 2659.6 kJ/kg, and u1 = 2709.9 kJ/kg

= 80 kJ − 5 kg (2659.6 − 2709.9) kJ/kg − (−18.5 kJ)

= 350 kJ

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A bar of 75 mm diameter is reduced to 73mm by a cutting tool while cutting orthogonally. If the mean length of the cut chip is 7
mote1985 [299]

Answer:

r=0.31

Ф=18.03°

Explanation:

Provided:

Original diameter of bar = 75 mm

Diameter post-cutting = 73 mm

Average diameter of the bar d= (75+73)/2=74 mm

Average length of uncut chip = πd

Average length of uncut chip = π x 74 =232.45 mm

Thus, cutting ratio r

Cutting\ ratio=\dfrac{Mean\ length\ of cut\ chip}{Mean\ length\ of uncut\ chip}

r=\dfrac{73.5}{232.45}   r=0.31

Therefore, the cutting ratio equals 0.31.

Now, the shearing angle is given as

tan\phi =\dfrac{rcos\alpha }{1-rsin\alpha }

Next by substituting the values

tan\phi =\dfrac{rcos\alpha }{1-rsin\alpha }

tan\phi =\dfrac{0.31cos15 }{1-0.31sin15 }\

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4 0
3 months ago
Suppose we include the lead resistance in the calculation of temperature for a class A RTD. If R3 = 1000 ohms, Ra = 18 ohms, V0
alex41 [359]

Respuesta:

La temperatura máxima que se puede medir (en °C) es 14170.27°C

Explicación:

Los RTDs son termómetros compuestos de metales cuya resistencia aumenta con la temperatura.

Para un RTD de Clase A, l, Alpha = 0.00385.

La fórmula para el RTD es

Rt = Ro ( 1 + alpha x t)

Donde

Rt es la resistencia a la temperatura t°C,

Ro es la resistencia a 0°C

Alpha es un coeficiente de temperatura constante para un RTD de clase A.

Aquí, Rt = 1000ohms,

Ro se considera como Ra = 18Ohms

Por lo tanto,

1000 = 18 ( 1 + 0.00385t)

Dividiendo ambos lados por 18

1 + 0.00385t = 1000/18

0.00385t = 55.55 - 1

0.00385t = 54.55

t = 54.55/0.00385

t = 14170.27°C

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