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Questions in engineering

[Answered] Why does water gush out of a joint connecting the CPVC pipe for a water heater? A. The drain line was backed up. B. The wrong kind of solvent was used. C. The pipe got too hot. D. The wrong type of heater was used.

[Answered] The tires on Don's tridem axle trailer are 285 mm wide. What is the maximum weight his trailer tires can support (the trailer uses duals on each axle)? A. 17100 kg B. 34200 kg C. 51300 kg

[Answered] Use the Laplace transform to solve the given initial-value problem. [tex]y^{\prime \prime}-5 y^{\prime}=8 e^{4 t}-4 e^{-t}, \quad y(0)=1, y^{\prime}(0)=-1[/tex] [tex]y(t)=[/tex]

[Answered] Where do all the contaminants and moisture removed from a refrigeration system end up? A. Rotary pump B. Pressure gauge C. Vacuum pump D. U-tube manometer

[Answered] Which of the following is appropriate when using an electronic vacuum gauge? A. Ensuring a sustained vacuum of at least 500 microns while using the vacuum gauge B. Installing the sensor horizontally to ensure contact with the system oil C. Allowing the vacuum pump to draw a vacuum of 475 microns HG before opening the valve D. Connecting the system directly to the sensor

[Answered] Use the Laplace transform to solve the given initial-value problem. [tex]2 y^{\prime \prime}+3 y^{\prime \prime}-3 y^{\prime}-2 y=e^{-t}, \quad y(0)=0, \quad y^{\prime}(0)=0, \quad y^{\prime \prime}(0)=1[/tex] [tex]y(t)=[/tex]

[Answered] When metering in zeotropes, the refrigerant must be ______ before entering the compressor. A. evaporated B. a liquid C. a charging device D. a vapor

[Answered] Which of the following most closely affects pressure? a) Diameter b) Oil return c) Flow direction d) Length e) Installation

[Answered] WATER FLOWS FROM A TANK OF CONSTANT CROSS-SECTIONAL AREA 50 [tex]FT ^2[/tex] THROUGH AN ORIFICE OF CONSTANT CROSS-SECTIONAL AREA [tex]\frac{ 1 }{ 4 }[/tex] [tex]FT ^2[/tex] LOCATED AT THE BOTTOM OF THE TANK. INITIALLY, THE HEIGHT OF THE WATER IN THE TANK WAS 20 FT, AND [tex]T[/tex] SEC LATER IT WAS GIVEN BY THE EQUATION [tex]2 \sqrt{h}+\frac{1}{25} t-2 \sqrt{20}=0 \quad 0 \leq t \leq 50 \sqrt{20}[/tex] HOW FAST WAS THE HEIGHT OF THE WATER DECREASING WHEN ITS HEIGHT WAS 3 FT? A. [tex]100 \sqrt{5}+50 \sqrt{3}[/tex] FT/SEC B. [tex]\frac{\sqrt{3}}{25}[/tex] FT/SEC C. [tex]100 \sqrt{5}-50 \sqrt{3} FT / SEC[/tex] D. [tex]\frac{3}{25}[/tex] FT/SEC

[Answered] Match the refrigeration system problem with the solution. Trapped air in a system Dirty piping Pinhole leak in hoses 1. Replace the hose. 2. Ensure that system valves are open before starting an evacuation. 3. Sweep the system with dry nitrogen before evacuation.