Mechanical Engineering Answers

Produce three design proposals that will meet the requirements a classroom chair suitable for tall tables.The proposals should be presented as a small design portfolio which must include: sketches

 information about materials and bought-in components/sub-assemblies

 a brief overview of manufacturing requirements

 design calculations

 references to legislation, standards and environmental issues.

A flywheel rotates with a constant retardation due to breaking from t=0to t=10 seconds. it made 400 revolutions . At time t=8 sec , it's angular velocity was 45πrad/sec. Determine

1 . Value of constant ratardation.

2. Total time taken to come to rest.

3. Total revolution made till it comes to rest.

The velocity of a particle which moves along the strait line with a velocity which is given in millimeter per second given by S= 4220t3- 116t²+ 45t-17, where t is in second. Calculate the Velocity and acceleration of a particle? if t= 3sec and t= 5sec then find out he value of a and v ?

An angular contact bearing of a lathe spindle is subjected to a cyclic radial load

during a manufacturing process in an automated plant. During the cycle, the

bearing experiences a radial load of 95 N for 30 s at 2 500 rpm, 75 N for 45 s at

3 500 rpm, and 115 N at 3 100 rpm for 15 s. Assume a shaft diameter of 15 mm.

Specify an appropriate bearing that will be used for 4 000 hours life with a 98 %

reliability. Give the bearing code as well as the relative ratings and dimensions.

1.Starting from the need, write a note on the life cycle of a common product that you use regularly. (Omit the technical details that are beyond your comprehension)

2. List the different disciplines/branches of engineering the combined efforts of which result in the successful design and development of some commonly used products/services. Relate them to the components

3. What are all main hazards related to oil and gas industry?

4. What are the benefits of occupational safety and health management system?

procedure of welding split air conditioner leakage in steps 

The Velocity Distribution for flow over a flat plate is given by u=(2/3)y-y2, Where u is the point velocity in meter per second at a distance y meter above the plate.

Determine the shear stress at y=0 and y=15 cm. Assume dynamic viscosity as 8.63 poises

Describe the company recording procedures to be used following repair, and how to apply them

Considering incompressible and laminar flow over a heated flat plate for which local Nusselt number, is given as, Nu, 0.332 Re2 Pri Prove that average Nusselt number, Nu, 2 Nu, L where L is the length of the plate.

Assignment

Anna, Sethiena and Edeen is three young ladies who work as employees for Steel 123 (Pty) Ltd in the coke plant. Coke is produced by igniting bituminous coal under

reduced oxygen conditions in oven batteries specifically designed for this process. The process generates volatiles such as coke oven gas, tar, ammonium sulphate, benzol, toluol and naphtha.

From the 1st of April 2021, the employer of Steel 123 (Pty) Ltd requires that Edeen be responsible for the dry distillation process. Since Sethiena have a diploma in Safety

Management, she is responsible for the quality of the coke that is generated. Anna is responsible to regulate the pollution and reducing the emissions from the coke oven.

1.1 Make recommendations to the owner of Steel 123 (Pty) Ltd about the PPE that must be supplied to Anna, Edeen and Sethiena respectively to protect them in

their departments.