Questions
Sketch and describe the working of a Locomotive boiler. Show the positions of fusible plug, blow...

Sketch and describe the working of a Locomotive boiler. Show the
positions of fusible plug, blow off cock, feed check valve and superheater.
Mention the function of each. Describe the method of obtaining draught in
this boiler.

In: Mechanical Engineering

Heat Transfer Problem You had been assigned, at General Motors as a design engineer, to design...

Heat Transfer Problem

You had been assigned, at General Motors as a design engineer, to design a radiator (Heat Exchanger) for a new model car . It is necessary that the heat exchanger will be compact enough to fit within a space of 2 feet by 3 feet available in front of the car. IF the temperature of the incoming engine coolant is 150 degree Centigrade and the outside temperature of air is about 38 C:

What type of heat exchanger could reduce the temperature of the coolant to 40 C? find the surface area and number of the tubes necessary to do so. Select the Coolant properties as water. The coolant is circulated by a water pump at a rate of 0.5 kg/sec. Show all your work and justify the selection you made. Make all other engineering assumptions necessary for this design.

In: Mechanical Engineering

2. Petroleum refining process involves distillation as the most important separation unit for purification of different...

2. Petroleum refining process involves distillation as the most important separation unit for purification of different products based on their volatility.
a. Discuss various types of distillation processes you may find in petroleum refineries   
b. What can be done to improve purity of a top product in a distillation column ​
  
c. What will be the effect of excessive reflux ratio in a distillation column ​
d. What are the operational factors affecting the efficiency of a distillation column
  
e. Discuss the problems of flooding and weeping in a distillation column ​​

In: Mechanical Engineering

heat transfer question, show equations, assumptions, calculations and steps clearly. will give thumbs up rating if...

heat transfer question, show equations, assumptions, calculations and steps clearly. will give thumbs up rating if solved correctly in 30 minutes

part a:

One of your hands is in still air at room temperature while the other one is in still water also at room temperature. Which hand will feel colder and why?

part b:

Why does sunscreen lotion prevent you from getting sunburn, but not from feeling the heat from the sun?

In: Mechanical Engineering

Please explain the meaning of design and analysis on automotive term. thanks

Please explain the meaning of design and analysis on automotive term. thanks

In: Mechanical Engineering

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure...

Consider a steam power plant operating on the ideal reheat Rankine cycle. Steam enters the high-pressure turbine at PH MPa and TH °C and is condensed in the condenser at a pressure of PL kPa. Assume the steam is reheated to the inlet temperature of the high-pressure turbine, and that pump work is NOT negligible. If the moisture content of the steam at the exit of the low-pressure turbine is not to exceed w% percent, determine:

(a) the pressure at which the steam should be reheated ,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

PH = 17.5 MPa, TH = 600 °C, PL = 15 kPa and w% = 9.9%.

In: Mechanical Engineering

A 2-stroke motor cycle petrol engine cylinder consists of 15 fins. If the outside and inside...

A 2-stroke motor cycle petrol engine cylinder consists of 15 fins. If the outside and inside diameter of each fin are 200 mm and 100 mm respectively, the average fin surface temperature is 475 c and atmospheric air temperature is 25 c calculate the heat transfer rate from the fins when the motor cycle is stationary.Assume all the fins in a horizontal position.

In: Mechanical Engineering

A sleeve coupling is used to connect two 50 mm shafts whose safe shearing stress is...

A sleeve coupling is used to connect two 50 mm shafts whose safe shearing stress is 70 MPa. Design the sleeve when it is made of cast iron with an ultimate shearing stress of 140 MPa. Also determine the factor of safety for which the sleeve has been designed. The length of the key is half the length of sleeve and the section of the key is 12.5 mm x 12.5 mm, find the shearing and crushing stresses induced in the key used.

In: Mechanical Engineering

A mechanical aim rotates in the vertical plan about point O. The slider P (m =...

A mechanical aim rotates in the vertical plan about point O. The slider P (m = 2 kg) is drawn toward O with a constant speed (?̇) of 0.5 m/s through the rough slot (friction coefficient µ = 0.1) by pulling on the free end E of the cord. At the instant when r = 0.25 m, the arm is rotating with a constant speed (?̇) of 10 rad/s in the clockwise direction.


When the slider is oriented at an angle of θ = 30° from the horizontal:

a) Plot the free body diagram for P, using r-? coordiantes; show positive r and ? directions (4 points)

b) Determine the normal force between the slider and the slot, in N (7 points)

c) Determine the tension in the cord, in N (7 points)

d) Which side (A or B) is in contact with the slider? Why? (2 points)

In: Mechanical Engineering

a building design was complete and is under construction. You had selected a window with a...

a building design was complete and is under construction. You had selected a window with a U-value of 1.6 and a solar heat gain coefficient (SHGC) of 0.25. The window manufacturer informs you that they no longer carry that window model, but that they can give you a window with a U-value of 1.6 and SHGC of 0.4.
How would this new window impact your building's modeled heating and cooling energy consumption?

In: Mechanical Engineering

The air inside inside a house is 14 oC and the convective heat transfer coefficient h...

The air inside inside a house is 14 oC and the convective heat transfer coefficient h = 11 W/m2⋅°C. The air outside the house is 49 oC and the convective heat transfer coefficient h = 7 W/m2⋅°C. A window has dimensions (2m x 2.5m x 8mm) and heat conduction of 0.8W/mk. Determine the total heat resistance through the window in oC/W

In: Mechanical Engineering

A CI engine operating on the air standard diesel cycle has cylinder condtioons at the start...

A CI engine operating on the air standard diesel cycle has cylinder condtioons at the start of compression of 65 degrees C and 130 kPa. light diesel fuel is used at an equivalence ratio of 0.8 with a combustion efficiency of 0.98. compression ratio = 18 Calculate:

  1. temperature and pressure in each state of the cycle (0c)
  2. pressure at each state of the cycle (kpa)
  3. cutoff ratio
  4. indicated thermal efficiency (%)
  5. heat lost in exhaust (KJ/Kg)

In: Mechanical Engineering

A converging-diverging nozzle is designed to operate with an exit Mach number of 2. The nozzle...

A converging-diverging nozzle is designed to operate with an exit Mach
number of 2. The nozzle is supplied from an air reservoir at 600 kPa and temperature
is 300 K. The throat area of the nozzle is 5 cm2
.
Determine:
(a) The ratio of exit-to-throat area and exit area
(b) Given the area ratio in part (a), find the range of back pressure over which the
nozzle is choked. What is the critical pressure and design pressure?
Also, calculate the mass flow rate when the nozzle is choked and at design
conditons.
(c) Determine the mass flow rate for a back pressure of 450 kPa and 500 kPa.
(d) Determine the mass flow rate for a back pressure of 0 kPa.
(e) Plot pressure variation along centerline of nozzle and mark all the points (back
pressures) on it.
(f) Use excel sheet to plot mass variation Vs back pressures and mark all points
on it.

In: Mechanical Engineering

Problem 1 Weekly assignment 2 (15%) Briefly discuss the definition, parts, advantages, applications, and examples of...

Problem 1
Weekly assignment 2 (15%)
Briefly discuss the definition, parts, advantages, applications, and examples of some projects done using LabVIEW. For the project’s examples, you need to include up to six references showing projects used LabVIEW to perform that project. In this problem, you need to write maximum about one page.
• Formats:
• Font Type: Calibri font
• Normal paragraph font size: 12 points
• Headings titles: 14 points
• Spacing: 1.5 spacing

In: Mechanical Engineering

in math lab how to simulated heat conduction and how to show it in a video...

in math lab how to simulated heat conduction and how to show it in a video sinulation
bottom code is a simulation of just the hear conduction without the video

clear,pack,clc

% material properties
k=200
cp=921
rho=2500
alpha=k/(cp*rho);

% introduce discretization constants
% time
delta_t=0.1;
%space
delta_L=0.01; % this is in meters

% how many points
N=100;

% constants a1, and a2

a1=1-2*(alpha*delta_t)/(delta_L^2);
a2=(alpha*delta_t)/(delta_L^2);


% introduce initial and boundary conditions

% initial condition
T0=zeros(N,1);
T0(1:floor(N/3))=30;

% boundary condition

% this is the left point next to the bar
T0_m1=500;

% this is the right point next to the bar
T0_Np1=10;
b=zeros(N,1);
b(1)=a2*T0_m1;
b(N)=a2*T0_Np1;



% define the A matrix
A=zeros(N,N);

for i=1:N
if i==1
A(1,1)=a1; A(1,2)=a2;
end
if i==N
A(N,N)=a1; A(N,N-1)=a2;
end
if (i>=2)&&(i<=N-1)
A(i,i)=a1;
A(i,i-1)=a2;
A(i,i+1)=a2;
end

end


% number of simulation steps
sim_steps=10000;

RESULT=zeros(N,sim_steps);

for j=1:sim_steps

if j==1
RESULT(:,1)=T0; % initial temperature
else

RESULT(:,j)=A*RESULT(:,j-1)+b;
end


end

imagesc(RESULT)

% RESULT is number of points X time

% middle point plotting

plot(RESULT(50,:))

hold on

plot(RESULT(80,:),'r')

In: Mechanical Engineering

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