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Questions in engineering

[Jawaban] When would a reductant system tamper warning service bay test need to be performed after a service procedure on the system? A. To ensure that the service procedure was successful B. To test the efficiency of the DOC C. To clear the message on the instrument panel D. To recalibrate the ECM with the emission system

[Jawaban] Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature- and pressure-limiting devices? A. Because freezing must be prevented and antifreeze may not be added B. Because water expands and contracts as its temperature changes C. Because building codes require certain controls on every system D. Because the copper piping used in the system requires these measures

[Jawaban] What is the significance of effective communication in steel erection? A. The team can discover shortcuts for the project B. The team can enhance the structural design C. The team can ensure worker safety D. The team can improve material quality

[Jawaban] R-123 at 14.7 PSIA will boil at approximately: A. $90^{\circ} F$ B. $82^{\circ} F$ C. $78^{\circ} F$ D. $74^{\circ} F

[Jawaban] Which of the following is a major advantage of battery-powered tools? A. Torque reaction B. Accuracy C. Power-to-weight ratio D. Portability

[Jawaban] When designing the jumps of a BMX racetrack, the jumps involve a launch ramp and a landing ramp. What are some facts about the placement of these features? Check all that apply. A. There must be at least ten launch ramps in every course. B. The slope of a launch ramp cannot be too high or too low. C. The length of a landing ramp must be long enough for riders to recover from the jump, but short enough so they do not lose speed for the next jump. D. There can only be one landing ramp in every course. E. The slope of a ramp is found by dividing the height of the ramp by the length of the ramp.

[Jawaban] Which of the following is a misuse hazard that could cause injury when using hand and power tools? A. Using a tool beyond its limits B. Using a tool that should be removed from service C. Using a tool with improper body positioning D. Using a tool when others are in harm's way E. All of the above

[Jawaban] Any overhead power line should be considered energized unless the entity owning or operating the electrical utility supplying the line certifies that it is: A. Not energized B. Visibly grounded C. Tested for zero energy D. All the above

[Jawaban] Where does refrigerant go after it leaves the purge unit of a low-pressure centrifugal system? A. The evaporator B. The condenser C. The compressor intercooler D. The recovery service vessel

[Jawaban] According to NFPA 70E, in the process for verifying an electrical safe work condition, what step is identified as "After properly interrupting the load current, open the disconnecting device(s) for each source"? A. Step 1 B. Step 2 C. Step 3 D. Step 4 E. Step 5