Answer the following with regard to the TTT diagram of a steel of eutectoid composition, shown in Fig. 18.13, and assumed that the specimens involved in the various cooling paths were cut from a thin sheet and austenitized at 750°C before cooling. Describe the microstructure resulting from being:

(a) Cooled to room temperature in less than 1 second.
(b) Cooled to 160°C in less than 1 second, and then maintained at this temperature for several years.
(c) Quenched to 650°C, and held at this temperature for 1 day, then quenched to room temperature.




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In certain cases, cutting and bending members to create joints for structural shapes may be more economical, even though more cutting and welding are required.

Answer the following statement true (T) or false (F)

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Which of the following methods are allowed to keep hot water available quickly at a remote plumbing fixture? Select all that apply.

A) Recirculating system using a pump. B) Recirculating system using gravity flow. C) Remote undercounter tank type heater.

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List three types of work possible in the electrical trade.

What will be an ideal response?

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_____ are a public health hazard and nuisance because they foul cars, statues, buildings, and sometimes people with their droppings

a. Sparrows b. Brown tree snakes c. Pigeons d. Hydrilla

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