A shaft cycles such that each bearing undergoes the radial loads of 30% of the time at 20kN, 50% of the time at 25kN, and 20% of the time at 30kN. If the design life of a bearing is to be at least 5e6 revolutions, select the smallest 03 series cylindrical roller bearing that will accomplish this.

Explain in details the environmental impact of ballast water in ship operation and discuss the role of the International Convention for the Control and Management of Ships' Ballast Water and Sediments (Ballast Water Management Convention or BWM Convention). Your answer should not be more than 2 pages (typed).

3. Use oil-tempered 0.060” diameter wire to make a spring with squared and closed ends, a
spring index of 4, and solid length of 1.25”. Use a load factor of safety of 1.05 and make the free
length 1.75 inches.

e) What is the force to close to solid, Fs?
f) What is the critical frequency?
g) What is the factor of safety, solid, ns?

1. Activity network diagram is used to develop a work schedule for the facilities design effort. Activity A to K is descried as follows: A with a duration of 2 month; B has immediate predecessor of A with total duration of 4 month; C has immediate predecessor of (A) with total duration of 2 month; (D) has immediate predecessor of B with total duration of 2month; (E) has immediate predecessor of B and C with total duration of 4 month; (F) has immediate predecessor of A and E with total duration of 6 month; (G) has immediate predecessor of D with total duration of 4 month; (H) has immediate predecessor of D, E, F with total duration of 2 month; (I) has immediate predecessor of H, F with total duration of 6 month; (J ) has immediate predecessor of H and F with total duration of 6 month, (K) has immediate predecessor of H, I, J with total duration of 4 month. What is the project duration and the critical activities?

3. If you are required to build Wind Turbine for industrial application, which factors will you consider? Hint: Approach the question through creative thinking.

Food security is among one of the key priority areas for many nations worldwide. Significant climate change resulting from global warming such as erratic weather patterns, prolonged draught and flooding present tremendous challenges to traditional farming. While conventional farming methods have sustained mankind since eons ago, these methods increasingly struggle to feed the burgeoning world population. Many uncertain factors faced by conventional methods include unpredictable weather or climate, rising material and labour costs, pestilence and disease as well as competition of land and water resources with the current population. Overfishing, waste plastic contamination, water pollution and dense aquaculture have led to dwindling supply and potentially contaminated seafood. High demand for poultry also resulted in the rising cost of feed and dubious supplements to enhance animal growth. Among the negative consequences include unequal food distribution (hunger or malnourishment versus food spoilage or waste at different locations), air and water contamination, extinction of wildlife, increased consumption of resources (water, land) and potentially, rise in overall food prices with shortage of food supply.

Select and briefly analyze two (2) challenges for a nation to maintain food security. Subsequently, design a control system that can help to address these challenges of food security. You are recommended to accomplish this task by fulfilling the following: (a) Illustrate the control system via a sketch. (b) Justify the selection of the major components of the control system (c) Explain the working principle of the control system.

Question 2

2.1       A brass rod of 25 mm in diameter is enclosed in a steel tube. The tube is 10 mm thick with an outside diameter of 50 mm. The bar and the tube are initially 1 m long and are rigidly fastened together at each end. Calculate the stresses in the two materials when the temperature is raised by 80 ⁰C.                               

2.2       If the composite bar is then subjected to an axial tensile load of 60 kN, find the resulting stresses.                                                                                                           

2.3       Calculate the final length of the composite rod. (use brass rod)                     

            E_st = 200 GPa; α_st = 12 x 10^-6 / ⁰C

            E_br = 100 GPa; α_br = 19 x 10^-6 / ⁰C

Identify five situations in which rotating unbalances can occur ?

A diesel engine has an inlet at 100 kPa, 310 K and a compression ratio of 21:1. The combustion releases 1400 kJ/kg. Find the cycle efficiency and mean effective pressure.

Compare and contrast EDS and XPS techniques in terms of i) working principle and ii) limitations of practical use.

I need summery between (4-10) pages about((A list of twenty regular verbs with base form, past simple and past participle with examples as complete sentences)) with name of the refrences in end page

A CCGT uses natural gas of net calorific value 50.05 MJ/kg as the fuel is utilised in a gas turbine power plant fitted with a heat recovery steam generator (HRSG) in its exhaust. There is a single gas turbine, which has a net power output of 176 MW; the exhaust gas from that turbine is fed into the HRSG which in turn is used to supply steam to a steam turbine.

The operating details for the gas turbine are:

Compressor inlet pressure: 100 kPa Compressor pressure ratio: 15:1

Ambient/air inlet temperature: 300 K

Turbine entry temperature: 1400 K Turbine exhaust pressure: 120 kPa

Isentropic efficiency of the compression is 88%, and that of expansion is 92%.

The operating details for the steam side are:

Turbine entry steam pressure: 50 bar

Turbine entry steam temperature: 450 °C

Condenser pressure: 0.1 bar Pinch point temperature difference: 25 °C

Turbine isentropic efficiency is 90%; neglect the feed pump work.

a. Find mass flow rate of the natural gas to the combustion chamber,

b. mass flow rate of air in the compressor,

c. and the mass flow rate of gas in the turbine and thermal/cogeneration efficiency.