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sustains a load of 70kN at its centre. The spring has 3 full length leaves and 15
graduated leaves with a central band of 100 mm width. All the leaves are to be
stressed to 400 MPa, when fully loaded. The ratio of the total spring depth to that
of width is 2. E=210 kN/mm2
. Determine
(i) The thickness and width of the leaves
(ii) The initial gap that should be provided between the full length and
graduated leaves before the band load is applied.
(iii)The load exerted on the band after the spring is assembled.
List four (4) main energy sources
The average annual electricity consumption by a household refrigerator has decreased from 1800 kWh in 1974 to 450 kWh today. Consider a country with 10 million households with a market penetration of 100 percent for modern refrigerators. If the refrigerators in this country were to continue to consume electric power at the 1974 levels, how much of additional installed power would be needed to meet this extra demand? Assume that the load factor (average fraction of installed power load that is actually produced) of the power plants is 0.8 and the power plants operate 90 percent of the time on an annual basis.
Which undesirable emissions are produced by the combustion of fossil fuels? What adverse effects are produced by these emissions?
waveguide is filled with air and the operating frequency is 50MHz. Find the
propagation constant, guide wavelength and cut off frequency for TE10,
TM11 and TE20 modes.
(9 Marks)
b) The following observations were taken with a separating and a throttling
calorimeter arranged in series
Water separated = 2 kg. steam discharged from the throttling calorimeter = 20.5
kg temperature of steam after thretting 110
2.1 Propose 2 to 5 suitable engineering materials (metals or non-metals) can be used to fabricate following components. You may survey more relevant resource online. a. Roller conveyer b. Conveyer leg mountings with the floor c. Heating oven d. Dipping tank e. Safety measures for workers
2.2 Estimate different degradation possible at the factory environment taking 4 components of the setup described above and propose precautions
2.3 Propose different destructive and non-destructive techniques can be used to identify quality (e.g. external cracks, internal cracks, colour variation, properties) of following components/ parts or products. Assume that you have provided a standard data sheet on theoretical values of each properties.
a. Final rubber product (assuming thinner tank shape, see cross section in Figure 10) b. Mould base c. Roller guides and stand welding joints
#339914 on Dec 2023