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You have been contracted to build a storage space for a company using hollow steel structures as the frame.10 m by 8 m by 5m (height) Design and analyze forces in all the members used
width = 50 mm, Number of pinion teeth = 30, Number of gear teeth = 60, Centre distance = 245 mm,
Normal pressure angle = 20⁰, Pinion speed = 1000 rpm, Permissible bending stress for pinion and gear
material = 150 N/mm2
, Surface hardness = 300 BHN, Factor of safety = 2.0, Service factor = 1.5, Grade
of machining =8. Determine: -
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?
(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
