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Questions in engineering

[Jawaban] Which rope cannot be reused for any reason? A. Throwline B. Escape ropes C. Broken rescue ropes D. Life safety ropes

[Jawaban] Select the best answer for the question. Why are systems with fixed-restriction metering devices critical to charge? A. The expansion device can't adjust to changing conditions. B. They can be charged only one time. C. The large liquid receivers hold so much refrigerant. D. You must weigh both the system and the refrigerant.

[Jawaban] What items are normally found in a NEMA Standard? Select all that apply, then select Submit. Marking Terms Rating Warranty

[Jawaban] Consider the following inverse forms: [tex]$L ^{-1}\left{\frac{s-a}{(s-a)^2+b^2}\right}=e^{a t} \cos (b t)$[/tex] and [tex]$L ^{-1}\left{\frac{b}{(s-a)^2+b^2}\right}=e^{a t} \sin (b t)$[/tex] Use the Laplace transform and these inverses to solve the given initial-value problem. [tex]$y^{\prime}+y=e^{-3 t} \cos (2 t), \quad y(0)=0$[/tex] [tex]$y(t)= \square$[/tex]

[Jawaban] Choose all options that apply. In a refrigeration system, moisture causes which of the following? a) Corrosion b) Valve failure c) Freeze-up of the expansion valve d) Motor insulation damage e) Solid contaminants

[Jawaban] True or False: As a standards organization, NEMA produces publications for installation groups only.

[Jawaban] How does a fluorescent dye leak detector work? A. It dyes the refrigerant so that escaping gas leaves a visible cloud. B. It's applied evenly to the outside of an area suspected of a leak. C. It dyes the refrigerant oil so that escaping oil leaves traces of dye. D. It's used in conjunction with ultrasonic detectors to improve the resolution of the mechanical ultrasou

[Jawaban] The most common hazards associated with pneumatic tools are: a) electrocution b) struck-by-flying-object c) caught-in-machinery d) pinned-between hazards.

[Jawaban] Why do some technicians recommend using a separate refrigerant tank when purging hoses? A. To maintain pressure levels B. To preserve coolant C. To continue refrigerant flow D. To preserve system charge

[Jawaban] Lisa is picking up a tridem-axle trailer. What is the semitrailer tridem axle's maximum axle spread? A. 1.85 m B. 2.8 m C. 3.7 m