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2 years ago

Preferential stress will cause crystals to rotate into a preferred orientation unless the crystals are ________

Engineering

1 answer:

velikii [3]2 years ago

6 0

Answer:

Preferential stress will cause crystals to rotate into a preferred orientation unless the crystals are Equant

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Which of the eight diagnostic steps for locating an engine performance problem is performed first?

Kay [80]

Answer:

D. Perform a thorough visual inspection.

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3 years ago

Water at atmospheric pressure boils on the surface of a large horizontal copper tube. The heat flux is 90% of the critical value

masya89 [10]

Answer:

The tube surface temperature immediately after installation is 120.4°C and after prolonged service is 110.8°C

Explanation:

The properties of water at 100°C and 1 atm are:

pL = 957.9 kg/m³

pV = 0.596 kg/m³

ΔHL = 2257 kJ/kg

CpL = 4.217 kJ/kg K

uL = 279x10⁻⁶Ns/m²

KL = 0.68 W/m K

σ = 58.9x10³N/m

When the water boils on the surface its heat flux is:

$q=0.149h_{fg} \rho _{v} (\frac{\sigma (\rho _{L}-\rho _{v})}{\rho _{v}^{2} } )^{1/4} =0.149*2257*0.596*(\frac{58.9x10^{-3}*(957.9-0.596) }{0.596^{2} } )^{1/4} =18703.42W/m^{2}$

For copper-water, the properties are:

Cfg = 0.0128

The heat flux is:

qn = 0.9 * 18703.42 = 16833.078 W/m²

$q_{n} =uK(\frac{g(\rho_{L}-\rho _{v}) }{\sigma })^{1/2} (\frac{c_{pL}*deltaT }{c_{fg}h_{fg}Pr } \\16833.078=279x10^{-6} *2257x10^{3} (\frac{9.8*(957.9-0.596)}{0.596} )^{1/2} *(\frac{4.127x10^{3}*delta-T }{0.0128*2257x10^{3}*1.76 } )^{3} \\delta-T=20.4$

The tube surface temperature immediately after installation is:

Tinst = 100 + 20.4 = 120.4°C

For rough surfaces, Cfg = 0.0068. Using the same equation:

ΔT = 10.8°C

The tube surface temperature after prolonged service is:

Tprolo = 100 + 10.8 = 110.8°C

8 0

3 years ago

You were hoping to receive a scholarship for volleyball and are entering your personal information and statistics on a secure we

kozerog [31]

I think it is fair to say 5 and 3/4 inches.

6 0

3 years ago

Read 2 more answers

Do the following addition exercises by translating the numbers into 8-bit 2's complement binary numbers, performing the arithmet

Ganezh [65]

Answer:

I am attaching a file with the solution and explanation as the number character limit is exceeding.

Explanation:

Download docx

8 0

3 years ago

Power supplies used in desktop computers many years ago, commonly referred to as AT, had a power switch that switched on the 120

Karolina [17]

Answer:

Power supply relay coil

Explanation:

The power supply known as ATX used in today's PCs is very complicated kind of power supply. The main objective of ATX form of the power supply is conversion of the input supply from the line into different voltages to be supplied in order to run the desktop computer's mother board.

While the AT supply that was used many years back that supplied about 120 VAC, The ATX power supply in today's world is capable of supplying power supply of about 300 W or more.

Power supply relay coil is a solitary estimation of source voltage planned by configuration to be connected to the input or coil.

4 0

3 years ago