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3 years ago

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An engineer designs a new bus that can drive 30 miles per gallon of fuel. Which of the following was likely one of the client’s

most important criteria?

2 answers:

Marat540 [252]3 years ago

7 0

What are the options?

anastassius [24]3 years ago

4 0

What are the options ?

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Steam enters an adiabatic turbine at 10 MPa and 500°C and leaves at 10 kPa with a quality of 90 percent. Neglecting the changes

Anna35 [415]

Answer:

The mass flow rate of steam m=5.4 Kg/s

Explanation:

Given:

At the inlet of turbine P=10 MPa ,T=500 C

AT the exit of turbine P=10 KPa ,x=0.9

Required power=5 MW

From steam table

<u> At 10 MPa and 500 C:</u>

h=3374 KJ/Kg ,s=6.59 KJ/Kg-K (Super heated steam table)

<u>At 10 KPa:</u>

$h_g$ =2675.1 KJ/Kg, $h_f$ =417.51 KJ/Kg

$s_g$ = 7.3 KJ/Kg-K , $s_f$ =1.3 KJ/Kg-K

So enthalpy of steam at the exit of turbine

h= $h_f+x(h_g- h_f)$

Now by putting the values

h= 417.51+0.9(2675.1- 417.51) KJ/Kg

h=2449.34 KJ/Kg

Lets take m is the mass flow rate of steam

So $5\times 10^3=m\times (3374-2449.34)$

m=5.4 Kg/s

So the mass flow rate of steam m=5.4 Kg/s

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3 years ago