Answer:
1.Applications. Soldering guns are used where more heat is needed than from the lower-power soldering irons. ... Because the temperature of the tip is not automatically regulated, use of a soldering gun for joints on printed circuit boards can result in too much heat supplied to the joint, damaging the circuit board.
2.PPE is equipment that protects workers against health or safety risks on the job and reduces employee exposure to hazards. The dangers can be anything from slippery wet floors to loose falling debris.
3.Buildings, structures, and infrastructure pass through a number of stages during their lifetimes: planning, design, construction, operations and maintenance, renewal and revitalization, and disposal (Figure 2.1). The total cost of ownership of facilities is the total of all expenditures that an owner will make over all of those phases (NRC, 2008).
However, the amounts and distributions of those expenditures are not equal. Design and construction which require large capital expenditures but will typically last fewer than 5 years account for 5 to 10 percent of the total cost of ownership. In contrast, the operations and maintenance of facilities will require annual expenditures for 30 or more years and will account for as much as 80 percent of the total cost of ownership (NRC, 1998).
