Mechanical Engineering Answers

The crate weighing 400 lb is supported by three ropes concurrent at B. Find the forces in ropes AB and BC if P=460 lb.

Line LM 58mm long is parallel to HP and inclined to VP at 45. If the point L is 20mm above HP and in VP then draw it's projections, also locate it's trace.

1. A hydraulic cylinder has bore of 50 mm and moves a mass of 10 kg. It is controlled with a valve with a constant kv = 80 Pa/m. The damping coefficient is 2 Ns/m.

A 50% total solids tomato puree is heated by steam as it flows through a steam injection heater (flash heating) at a rate of 500 kg/h. The steam (100% quality) is generated at 169.06 kPa and is flowing to the heater at a rate of 40 kg/h. The specific heat of the solids in the product is 3.2 kJ/kg K and the initial temperature of the puree is 40oC. Assume the specific heat of the solids in puree is not influenced by the heating process. Given: specific heat of water Cp = 4.18 kJ/kg K a. Draw a flow chart for the process with clear labeling. b. Make all necessary assumptions. c. Determine the temperature of the product leaving the heater. d. Determine the total solids content of the product after heating.

One stage of a cascade impactor designed to operate at 1.0 ft/min at standard conditions has a cutoff diameter of 5 um. What will be the cutoff diameter for this stage if it is operated at 300°F, but flow is measured at 1.0 ft/min after the gas has cooled to standard conditions? 

A total of 10 rectangular aluminum fins (k = 203 W/m·K) are placed on the outside flat surface of an electronic device. Each fin is 100 mm wide, 20 mm high and 4 mm thick. The fins are located parallel to each other at a center-to-center distance of 8 mm. The temperature at the outside surface of the electronic device is 60°C. The air is at 20°C, and the heat transfer coefficient is 100 W/m2 ·K. Determine (a) the rate of heat loss from the electronic device to the surrounding air and (b) the fin effectiveness.

Can a full detailed description be given on how a aluminium frying pan is made through casting?

QUESTION 3 [ 17 Marks]

(a) Give the different types of loading and supports on a beam.

[7]

(b) State the assumptions made in the theory of pure bending.

[3]

(c) In a civil engineering construction site, a rectangular support beam 100 mm wide and

250 mm deep is exposed to a maximum shear force of 50kN. You are required to

calculate:

(i)

Average shear stress,

(ii)

Maximum shear stress,

(iii)

Shear stress at 25 mm above the neutral axis