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3 years ago

6

Hydrogen is preferred for regeneratively cooled nozzles because it is easy to pump. a)-True b)-False

1 answer:

Roman55 [17]3 years ago

6 0

Answer:

TRUE

Explanation: Hydrogen is preferred for regeneratively cooled nozzles because it is easy to pump. we all know that hydrogen is a very light gas so its pumping is very easy and for regeneratively cooled nozzles we need the gases which can be pumped very easily and hydrogen is very light so its pumping is easy and we can use it in regenratively cooled nozzles.

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The question is incomplete. The complete question is :

The hydrofoil boat has an A-36 steel propeller shaft that is 100 ft long. It is connected to an in-line diesel engine that delivers a maximum power of 2590 hp and causes the shaft to rotate at 1700 rpm . If the outer diameter of the shaft is 8 in. and the wall thickness is $\frac{3}{8}$ in.

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Given :

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$= 1700 \frac{\text{rev}}{\text{min}}\left(\frac{2 \pi \text{ rad}}{\text{rev}}\right) \frac{1 \text{ min}}{60 \ \text{s}}$

$= 56.67 \pi \text{ rad/s}$

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Torque, $T = \frac{P}{\omega}$

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= 8001.27 lb.ft

A). Therefore, maximum shear stress is given by :

Applying the torsion formula

$\tau_{max} = \frac{T_c}{J}$

$=\frac{8001.27 \times 12 \times 4}{\frac{\pi}{2}\left(4^2 - 3.625^4 \right)}$

= 2.93 ksi

B). Angle of twist :

$\phi = \frac{TL}{JG}$

$=\frac{8001.27 \times 12 \times 100 \times 12}{\frac{\pi}{2}\left(4^4 - 3.625^4\right) \times 11 \times 10^3}$

= 0.08002 rad

= 4.58°

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