Mechanical Engineering Answers

Air (1100 K/ 101.32 kPa) is passing through a converging nozzle and leave it at 300 K. Determine the velocity of air at the nozzle outlet. The nozzle is laid horizontal. The inlet velocity of air can be ignored.

In a remote area, water is to be supplied from underground water source, whose free surface is 100 m. below ground level, using a water pump. This water is to be stored in a water tank at a height of 10 m. from the ground level. This pump is connected with an inlet pipe of diameter 20 cm. and outlet pipe of diameter 30 cm. determine the power input to this pump for steady water supply 17. of 20 L/s. assume no heat interaction during this process.

Draw the profile of the cam when (a) the line of stroke of the valve rod passes through the axis of the cam shaft, and (b) the line of the stroke is offset 20 mm from the axis of the cam shaft. The cam shaft has maximum velocity and acceleration at 100 rpm and during valve raised and lowered have 0.30 m/s; 0.725 m/s and 6.13 m/s2; 24.67 m/s2 respectively

What is the solution?

A man holds a ball of weight 114g at rest in his hand. He then throws the ball vertically upward. In this process, his hand moves up 0.6m and the ball leaves his hand with an upward velocity of 15 m/s. Find the force with which the man pushes on the ball.

Answer = 22.5 N

first and last gear having teeth 30 and 50 respectively of a simple gear train what will be train value and speed ratio gear respectively if first gear is driving gear

Using the company in which you work, one you have visited or the one in task 3, evaluate the importance and effects of external factors on the business’s operation. The most straightforward approach is to use a real company so that you have access to published financial data (such as share prices and trading figures) and other economic data.

You are looking to evaluate what happens if for example:

n  the Bank of England base rate changes

n  conflict between countries increases or is resolved

n  climate change and carbon footprint issues increase

n  raw material prices change

n the supply chain for strategic materials changes.

n changes in demand for products or similar products

n new materials

n other external factors?

Analyse the importance of external factors using suitable business tools (e.g. SWOT, PESTLE or other tools)

Write a brief report that evaluates external factors in terms of their importance and possible effect or impact on an engineering company

explain the procedure by which mechanical engineers or motor mechanics fasten engine bolts using a ratchet.

5) A pair of standard spur involute gears has a module of 5 mm, pressure angle α=20。, center distance a=350 mm, transmission ration i12=9/5. Calculate the numbers of teeth (Z1 and Z2), reference diameters (d1 and d2), addendum diameters (da1 and da2), base diameters (db1 and db2), tooth thickness s , space width e, pressure angles on the addendum circles (αa1 and αa2) the radio of curvatures of tooth profile on the reference circles

(ρ1 and ρ2), and the radio of curvatures of tooth profile on the addendum circles (ρa1 and ρa2 ).

 Please explain the following nouns and take an example:

1. Instantaneous Center

2. Disc cam

A ractangular woodern block with dimensions 0,6m x 0,5m x 0,3m high floats on water(1000kg/m^3). The woodern block has a density of 800kg/m^3. Determine the height of the block protruding from the water.