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Questions in engineering
📝 Answered - What items are normally found in a NEMA Standard? Select all that apply, then select Submit. Marking Terms Rating Warranty
📝 Answered - 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]
📝 Answered - 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
📝 Answered - True or False: As a standards organization, NEMA produces publications for installation groups only.
📝 Answered - 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
📝 Answered - The most common hazards associated with pneumatic tools are: a) electrocution b) struck-by-flying-object c) caught-in-machinery d) pinned-between hazards.
📝 Answered - 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
📝 Answered - 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
📝 Answered - Which of the following devices help prevent high-pressure nozzle release and protect pneumatic tool operators in the event of a high-velocity nozzle ejection? A. Appropriate head, eye, and face protection B. Safety clips C. Manual operating valves D. Diffuser nuts and tip guards
📝 Answered - A(n) __________ is a cutting tool consisting of a power-operated wheel with rough grains held together by organic or inorganic bonds. a) guillotine cutter b) electric drill c) power saw d) abrasive wheel
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