Questions
Explain the advantages and disadvantages of employing symmetry when preforming a buckling analysis in ANSYS

Explain the advantages and disadvantages of employing symmetry when preforming a buckling analysis in ANSYS

In: Mechanical Engineering

Explain the Hume-Rothery Rule. Which parameters are more critical than others? What happens if two metals...

Explain the Hume-Rothery Rule. Which parameters are more critical than others? What happens if two metals satisfy/don’t satisfy the rule?

In: Mechanical Engineering

1- In a system with outdoor air for ventilation: (a) the load on coil is equal...

1- In a system with outdoor air for ventilation:
(a) the load on coil is equal to the load on building
(b) the load on building is greater than the load on coil
(c) the load on building is less than the load on coil
(d) the Coil ADP is less than room ADP.
2- Evaporative cooling systems are:
(a) attractive for hot and humid climates
(b) attractive for hot and dry climates
(c) ideal for comfort applications
(d) ideal for several industrial applications
3- Selection of a suitable air conditioning system depends on:
(a) Type of the building
(b) Initial and running costs
(c) Reliability and serviceability
(d) All of the above
3- Match the following:
(a) A large precision laboratory a. Variable air volume system
(b) Perimeter zone of a building b. Constant air volume system
(c) Simultaneous cooling and heating c. Multiple zone, single duct system
(d) A large building complex d. Dual duct system
4- A dedicated outside air unit is used to pre-cool 2,500 CFM(1.18m3
/s) of outside air at
31 °C DB and 85% relative humidity to 15.5 °C DB, 14 °C WB. What is the quantity of
water removed by the coil in GPM?
(a) 0.29 ?PM
(b) 0.33 ?PM
(c) 2.9 ?PM
(d) 2.4 ?PM
5- Which of the following statements are TRUE?
(a) Compared to central systems, the initial cost of a unitary system is less
(b) Unitary systems can be installed quickly and their operation is relatively simple
(c) Unitary systems consume less power compared to central systems of same capacity
(d) Unitary systems are ideal for retrofitting applications
6-Unitary refrigerant based systems are:
(a) used for very small capacities only
(b) are available only for cooling applications
(c) couldnot factory assembled with a performance guaranteed by the manufacturer
(d) also called as package units.
7- State which of the following statements are TRUE?
(a) By improving the internal air movement, the energy consumption of the air
conditioning system can be reduced substantially
(b) By increasing air movement, the thermostat of the air conditioning system can be
set at a lower temperature

In: Mechanical Engineering

A single-cylinder, four stroke research engine operates on Otto cycle. The specification of the engine is...

A single-cylinder, four stroke research engine operates on Otto cycle. The specification
of the engine is shown as below:-
Displacement volume of the cylinder = 560 cm3
Clearance volume of cylinder = 70 cm3

Minimum temperature = 200°C
Minimum pressure = 200 kPa
Net work output = 1000 kJ/kg
Sketch the process on a P-V diagram and by using constant specific heat at room
temperature, determine:

1) the temperature and pressure at each process,
2) the thermal efficiency of the engine, and
3) the Mean Effective Pressure (MEP).

In: Mechanical Engineering

create a tool for detailed design and stress analysis of Spur Gears. Your tool can be...

create a tool for detailed design and stress analysis of Spur Gears. Your tool can be based on one oft he following or a combination of any:, Matlab, Excel Spreadsheets, KISS soft software, Python,etc. and it can be supported by any FEA and/or CAD software .Use your developed tool to solve a full design problem of your choice.

In: Mechanical Engineering

We want to determine spesifications of very toxic fuel especially the particle diameters. After some studying...

We want to determine spesifications of very toxic fuel especially the particle diameters. After some studying we claim that the particle diameter is dp, exit speed is U, the liquid viscosity is u, surface tension is Y, density is p, the diameter of spraying injector exit is D. For a secure experiment we need to work with water. Design an experiment with water and determine the required conditions. Finally, for toxic fuel use the results of experiment for determining spesifications (especially the partical diameter) with mathematical expressions use dimensionless numbers if needed.

In: Mechanical Engineering

(10 pts) A simple Rankine cycle operates between the pressures of 10 kPa and 6 MPa....

  1. (10 pts) A simple Rankine cycle operates between the pressures of 10 kPa and 6 MPa. Steam exits the boiler at 550oC, liquid exits the condenser at 40oC, the “wet steam” exiting the turbine has a quality of 90%, the pump efficiency is 64% and the net power output from the system is 87.2 MW. Determine:
  1. (2 pts) The mass flow rate through the system, in kg/s.
  2. (2 pts) The rate of heat rejection from the condenser, in kW.
  3. (2 pts) The rate of heat input, in kW.
  4. (2 pts) The thermal efficiency.
  5. (2 pts) The isentropic efficiency of the turbine.

In: Mechanical Engineering

Explain the design complexity in axial flow turbine and compressor and their solution in brief.

Explain the design complexity in axial flow turbine and compressor and their solution in brief.

In: Mechanical Engineering

4.Write a report on AI based Social distancing monitoring using drone with out human interaction report...

4.Write a report on AI based Social distancing monitoring using drone with out human interaction report should contain drone design it specification it's algorithm control system algorithm.minimum 10 A4 size page.No plagiarism is allowed other wise down rate is given

don't copy from old answer

In: Mechanical Engineering

The terrace roof of a building at sea level is planned to have a rectangular floor...

The terrace roof of a building at sea level is planned to have a rectangular floor area with dimensions of 10 m and 20 m. The prevailing wind speed in winter is u∞=25 km/h, and air temperature is assumed to be T∞=0°C. Considering that the outer surface temperature of the building is To=10°C, how should the building be positioned with respect to the prevailing wind direction to minimize the heat loss from the roof ?

In: Mechanical Engineering

Question of Thermodynamics Q2    Ethyl alcohol is burnt in a petrol engine, calculate A     stoichiometric A/F...

Question of Thermodynamics

Q2    Ethyl alcohol is burnt in a petrol engine, calculate
A     stoichiometric A/F ratio.
B    Air fuel ration and wet and dry analysis of exhaust gases by volume of exhaust gases for mixture strength of (90%+Last digit of your roll number).
C    Air fuel ration and wet and dry analysis of exhaust gases by volume of exhaust gases for mixture strength of (120%%+Last digit of your roll number).

Last Digit is 1. Kindly solve it step by step as it is for final practice.

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 50 minutes

Name the different heat transfer modes, and for each mode provide the governing law and an example from your everyday life.

In: Mechanical Engineering

Question 3 (a) I am engineering material science student (AIT). A senior family member back at...

Question 3
(a) I am engineering material science student (AIT). A senior family member back at my village has had an accident over the weekend with a broken hip and the Doctors have suggested that he should have material implant (Materials for Hip Prosthesis). What type of material would you choose for an implant for a total hip replacement and why? (Please consider the following factors for your decisions: biocompatibility, corrosion resistance, high fracture toughness, excellent fatigue life (so that implants last for many years since it is difficult to do the surgery as patients get older), and wear resistance)


(b) COV-19 has brought difficulties and changes in life style for everybody in and outside Ghana. Mr. Haruna needs water storage tank, and he wants it to be made from metal, but he wish to coat the metal with a 3-mm thick polymer as an intermediate layer between the metal and additional insulation layers. The temperature of the intermediate layer may drop to -80°C.
What type of polymer material will you choose for this coat (layer) and why?


(C) COV-19 has come to stay with us, and we need personal protective equipment (PPEs) to go about our daily work (activities). As Engineering material science student ,what type of polymer material will you recommend for the following applications and why?:
(i) A surgeon’s glove,
(ii) A beverage container,
(iii) And a pulley.

In: Mechanical Engineering

Hello! I am using Ansys Fluent to discuss air-flow in a 2D channel, so which solver...

Hello! I am using Ansys Fluent to discuss air-flow in a 2D channel, so which solver should I use? Do I need to use density based solver or Pressure base solver? Is air-flow compressible flow or incompressible flow? ( For me, I think I should use density based solver, because air-flow is compressible flow, but I am not sure about myself, this is why I ask for help from everyone who can help me). Thank You in advance! I will thumb you up!

In: Mechanical Engineering

Estimate the axial infinite fatigue strength (10⁶) and 10³ fatigue strength for a 25 mm diameter...

Estimate the axial infinite fatigue strength (10⁶) and 10³ fatigue strength for a 25 mm diameter reversed axially loaded steel bar having Su =950 Mpa, Sy = 600 Mpa and is made from a “cold drawn” steel.

Assume: T< 840º F, 99 % Reliability, CG = .8

In: Mechanical Engineering