Questions
A U- tube manometer is used to measure the pressure of oil of specific gravity 0.85...

A U- tube manometer is used to measure the pressure of oil of specific gravity 0.85 flowing in a pipe line. It is left end is connected to the pipe and right –limb id open to the atmosphere. The center of the pipe is 100 mm below the level of mercury (specific gravity =13.6) the right limb .if the difference of mercury level in the two limbs is 160 mm. determine the absolute pressure of the oil in the pipe.

In: Mechanical Engineering

A round composite bar is used to conduct heat. It is held at 600K at one...

  1. A round composite bar is used to conduct heat. It is held at 600K at one end and 1000K at the other end but all other surfaces are insulated. The two end pieces of the bar are Stainless Steel (AISI304), and the middle piece is Copper. The length of each piece of the bar is 0.2m (total length is 0.6m) and the diameter is 0.07m. Generate an x-y plot of the temperature distribution along the center axis of the bar (plot T vs x). Select your own values for T1 and T2. Assume zero contact resistance between the sections.
  2. Solve this problem by hand and provide a plot of the temperature distribution for the composite bar. Include your hand calculations in your deliverable. You can use equation editor or include a photo of your paper if your handwriting is tidy and the picture is properly cropped

In: Mechanical Engineering

Solid desiccant air dehumidifier systems are widely used to supply dry air for many industrial processes....

Solid desiccant air dehumidifier systems are widely used to supply dry air for many industrial processes. As humid atmospheric air flows through the system, the water vapor in the air is adsorbed by the desiccant material, resulting in dry air leaving the system. Inlet air velocity and tekperature are observed as predominant parameters that influence the outlet conditions of the air. Consider a cylindrical air channel with a length of 1 meter and an inner diameter of 20 mm, as a representative of a dehumidifier system. The wall of the channel is made of silica powder material with a thickness of 0.2 mm. Air enters the channel at Ti = 30°C and 10 m/s. Heated air is forced to flow over the entire channel so that it could provide a constant inner surface temperature, Ts,i of 60°C. Determine,

i. the exit air temperature of the channel, Te, oC

ii. the rate of heat transfer, and

iii. the outer surface temperature of the channel, Ts,o, oC.

Evaluate the air properties at a bulk mean temperature of 40°C

In: Mechanical Engineering

B- For design of a car suspension system, what type of vibrational system you would choose...

B- For design of a car suspension system, what type of vibrational system you would choose (over damped, under damped, critical damped) and why (bring 2 reasons for your selection)?

C- For design of an office door stopper system, what type of vibrational system you would choose (over damped, under damped, critical damped) and why (bring 2 reasons for your selection)?

In: Mechanical Engineering

Crude oil of specific gravity (0.75) is flowing through a pipe. The pipe has a diameter...

Crude oil of specific gravity (0.75) is flowing through a pipe. The pipe has a diameter of 100 mm and 50 mm at the sections 1 and 2 respectively. The velocity of crude oil at the section 1 is 550 cm/s. The   section 1 is 3000 mm and section 2 is 2000 mm above the datum. If the pressure at the section 1 is 0.2 N/mm2, find the intensity of pressure at section 2?

In: Mechanical Engineering

What techniques can be used to predict the failure of machine/equipment for the purpose of preventive...

What techniques can be used to predict the failure of machine/equipment for
the purpose of preventive maintenance.

In: Mechanical Engineering

Performance evaluation of cold tube heat exchanger for various L/D ratio and mass flow rate.   using...

Performance evaluation of cold tube heat exchanger for various L/D ratio and mass flow rate.   using Ansys show the temperature distribution.   and make a mathematical model in scilab and perform simulation in fortran 77...

In: Mechanical Engineering

A single start square- thread power screw has a diameter of 2 inches and a pitch...

A single start square- thread power screw has a diameter of 2 inches and a pitch of .4 inches.

Calculate the:

  1. Lead
  2. Mean pitch diameter
  3. Lead angle (λ)
  4. Normal angle (αn

In: Mechanical Engineering

Task 1 Company 1 is new into distillation & separation has approached CD19 for support on...

Task 1
Company 1 is new into distillation & separation has approached CD19 for support on the following problem: -
(a) They wish to separate a 50-gram sample of a new liquid compound, by heating it in a reactor to convert it from liquid to gas. The final pressure of the gas should be 775 mmHg at 24oC. They are struggling to find the volume of the reactor. Can you help? What volume of the reactor will be required to achieve the stated requirements?

(b) Another placement student suggests that by chilling the gas by 15oK will reduce the size of the reactor. Is the second engineer correct and by how much would the volume change?

(c) The temperature and pressure effects on a liquid can be described by the kinetic molecular theory. The customer would like you to explain this in a short and concise manner.
You are expected to draw a diagram (labeled) of the relationship between temperature and pressure for a liquid that is heated to form an ideal gas. Relative phase compositions should also be labeled.

Data
MWSample = 550 g/mol
1 mmHg = 133.32 Pa

In: Mechanical Engineering

Write the Conservation of mass equation as it applies TO YOUR SYSTEM • Write the Conservation...

Write the Conservation of mass equation as it applies TO YOUR SYSTEM

• Write the Conservation of Energy equation as it applies TO YOUR SYSTEM

• List all the assumptions and idealizations for the process

Diesel cycle

Fuel being used is diesel

1 cylinder, four-stroke, water-cooled, air injection of fuel
Output: 14.7 kW (20 hp)
Fuel consumption: 317 g/kWh (238 g/hp-hr)
Efficiency: 26.2%
Number of revolutions: 172 min-1
Displacement volume: 19.6 L
Bore: 250 mm
Stroke: 400 mm

In: Mechanical Engineering

A gas turbine power plant operates on a Brayton cycles has a pressure ratio of 7....

A gas turbine power plant operates on a Brayton cycles has a pressure ratio of 7. Air enters the
compressor at 300 K. The energy in the form of heat is transferred to the air in the amount of 950
kJ/kg. Using a variable specific heat for air and assuming the compressor isentropic efficiency is
83 percent and turbine isentropic efficiency is 85 percent. Determine the followings:
(i) The highest temperature in the cycle [5 marks]
(ii) The net work output, in kJ/kg [10 marks]
(iii) The back work ratio [5 marks]
(iv) The thermal efficiency. [5 marks]
(v) Show the cycle on T-s diagram [5 marks]

In: Mechanical Engineering

Use your mechanical engineering skill. Explain in 200 - 250 words why DOE is important for...

Use your mechanical engineering skill. Explain in 200 - 250 words why DOE is important for a Mechanical Engineer using an example. In this section, it is not expected you implement DOE in one full example. The idea in that you reflect DOE understanding in a Mechanical field. Feel free to use any source but the answer must be thorough.

Please type, make it easy to understand.

In: Mechanical Engineering

Ideal Reheat Steam Cycle (10) Consider a steam power plant operating on the ideal reheat Rankine...

Ideal Reheat Steam Cycle (10)

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 and show how you got the quality,

(b) the total turbine work ,

(c) the net work ,

(d) the total heat input , and

(e) the thermal efficiency of the cycle .

PH = 20 MPa, TH = 700 °C, PL = 10 kPa and w% = 12.9%.

In: Mechanical Engineering

Determine the adiabatic combustion temperature at constant pressure and at constant volume for two of the...

Determine the adiabatic combustion temperature at constant pressure and at constant volume for two of the fuels of personal choice. Graphically show that this corresponds to the product temperature where the heat of reaction is zero.

In: Mechanical Engineering

At a point in a stressed body, the principal stresses are 100 MN/m2 (tensile) and 60...

At a point in a stressed body, the principal stresses are 100 MN/m2
(tensile) and 60 MN/m2
(compressive). Determine the normal stress and
the shear stress on a plane inclined at 50degree
counter clockwise to the axis
of minor principal stress. Also, calculate the maximum shear stress at the
point and draw the Mohr’s stress circle to verify the answers.
If the yield strength and Poisson’s ratio of the material in the above case
is 240 MPa and 0.3 respectively, check whether the failure will occur or
not according to (a) Maximum principal strain theory and (b) Maximum
shear strain energy per unit volume theory. If failure does not occur,
calculate the Factor of Safety.

In: Mechanical Engineering