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3 years ago

How to comment other people

Engineering

2 answers:

andrew-mc [135]3 years ago

7 0

You go to answer on the bottom then press on whichever one you want to answer

Mekhanik [1.2K]3 years ago

4 0

What you mean?? .!.!.!.!!.

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Air at p=1 atm enters a long tube of length 2.5 m and diameter of 12 mm at an inlet temperature of Tm,i=100oC and mass flowrate

Annette [7]

Answer:

The heat transfer q = 18.32W

Explanation:

In this question, we are asked to calculate the heat entering the tube and also evaluate properties at T =400K

Please check attachment for complete solution and step by step explanation

6 0

4 years ago

Air expands through a turbine from 10 bar, 900 K to 1 bar, 500 K. The inlet velocity is small compared to the exit velocity of 1

Elis [28]

Answer:

- the mass flow rate of air is 7.53 kg/s

- the exit area is 0.108 m²

Explanation:

Given the data in the question;

lets take a look at the steady state energy equation;

m" = W" $_{cv$ / [ (h₁ - h₂ ) - $\frac{V_2^2}{2}$ ]

Now at;

T₁ = 900K, h₁ = 932.93 k³/kg

T₂ = 500 K, h₂ = 503.02 k³/kg

so we substitute, in our given values

m" = [ 3200 kW × $\frac{1\frac{k^3}{s} }{1kW}$ ] / [ (932.93 - 503.02 )k³/kg - $\frac{100^2\frac{m^2}{s^2} }{2}$ | $\frac{ln}{kg\frac{m}{s^2} }$ || $\frac{1kJ}{10^3N-m}$ | ]

m" = 7.53 kg/s

Therefore, the mass flow rate of air is 7.53 kg/s

now, Exit area A₂ = v₂m" / V₂

we know that; pv = RT

A₂ = RT₂m" / P₂V₂

so we substitute

A₂ = {[ $(\frac{8.314}{28.97}\frac{k^3}{kg.K})$ × $500 K$ × $(7.54 kg/s)$ ] / [(1 bar)(100 m/s )]} | $\frac{1 bar}{10N/m^2}$ || $10^3N.m/1k^3$

A₂ = 0.108 m²

Therefore, the exit area is 0.108 m²

8 0

3 years ago

You receive the bill for servicing your diesel engined car. As a good engineer you immediately notice that one of the items on b

vichka [17]

Answer:

b. spark plugs

Explanation:

Diesel engines are characterized in that the mechanism that activates the explosion of fuel is high pressures, so when the piston reaches the top of the cylinder, the pressure of the air-diessel mixture is so high that it causes the explosion, this It is what generates the power in a diesel engine.

3 0

3 years ago

Steam enters a counterflow heat exchanger operating at steady state at 0.06 MPa with a quality of 0.9 and exits at the same pres

Pie

Explanation:

$\begin{array}{ll}\1 & \2 \\P_{1}=0-\_{\text {mpa }} \text { Steam } & P_{2}=0.06 mpq \\x=0.9 & x=0 \text { (satunated liquid) }\end{array}$

a) Term of entering steam will be Tsaturated of corresponding pressure

$so, At P =0.06 mpa , T_{s a t}=85.92^{\circ} C$

$\begin{aligned}Q &=m c_{p}\left(T_{0}-T_{i}\right) \\&=\frac{100}{60} \times 1.005(60-30)=50.25 W\end{aligned}$

5 0

4 years ago

Write a Person class with a constructor that accepts the following details:

Liono4ka [1.6K]

The person class is an illustration of constructors;

In computer programs, constructors are automatically called when the object of a class is created

<h3>The program in C++</h3>

The class and the constructor program written in C++ programming language is as follows:

int main(){

string fname, lname,dob,idno,mobileno;

cin>>lname; cin>>fname; cin>>dob; cin>>idno; cin>>mobileno;

Person c(fname,lname,dob,idno,mobileno);

if(mobileno.length() == 12){

if(mobileno[3] == '-' && mobileno[7] == '-'){

cout << "Name: " << c.getfname() << " " << c.getlname() << endl

<< "Date of birth: " << c.getdob() << endl

<< "ID number: " << c.getid() << endl

<< "Mobile: " << c.getmobile() << endl

<< "Age: "<< getAge(dob)<<endl;

;

}

The complete program is added as an attachment