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Questions in engineering

[Free] Listen Which of these is least likely a step in replacing a failed compressor? A) Flushing the system B) Replacing the condenser C) Disconnecting and sealing the hoses D) Inspecting the muffler

[Free] Select the best answer for the question. What's needed to calculate the CFM required to provide a given number of air changes in a building? A. Floor area, ceiling height, and fan horsepower B. The floor area, ceiling height, and an enthalpy chart C. The floor area and ceiling height D. A psychrometric chart and an enthalpy chart

[Free] Which statement describes the purpose of tags when locking and tagging out? A. They communicate danger and warn workers not to start, energize, operate, or close that equipment. B. They identify that a piece of equipment will not operate due to repairs or maintenance. C. All of the above

[Free] Select the best answer for the question. 17. Which of the following is similar to a refrigeration-cycle dehumidifier? A. A gas-fired furnace with an integrated compressor B. An evaporative air conditioner C. A commercial freezer with an automatic defrost cycle D. A window unit with a single airflow over both the evaporator and condenser

[Free] In situations where excavation operations endanger the stability of nearby buildings, walls, or other structures, what must be included as part of your employer's excavation plan? A. Support systems B. Mineral analyses C. Structural blueprints D. Contingency plans

[Free] In a refrigeration unit, the mechanic must replace a fan with a faster one. The old fan delivers 5,200 cubic feet per minute (CFM) and runs at 450 revolutions per minute (RPM). The new fan must deliver 6,500 CFM. Calculate the required new RPM. Round to the nearest whole number. Use the formula: [tex]$\frac{C F M_{\text {new }}}{C F M_{\text {old }}}=\frac{R P M_{\text {new }}}{R P M_{\text {old }}}$[/tex] A. 562 RPM B. 563 PPM C. 751 RPM D. 320 RPM

[Free] How often should you check the engine oil level? A. twice each year B. once each month C. before each outing D. before each boating season

[Free] Heavy equipment operators excavate holes and load the material into dump trucks which take the soil away from the jobsite. The material removed from the hole increases in volume because air gets mixed in with it. This is called swell. Topsoil has a swell factor of $40 \%$. Calculate the total volume of topsoil excavated from the hole. $108 m^3$ $378 m^3$ $270 m^3$ $162 m^3

[Free] Heavy equipment operators excavate holes and load the material into dump trucks which take the soil away from the jobsite. The material removed from the hole increases in volume because air gets mixed in with it. This is called swell. Topsoil has a swell factor of $40 \%$. Calculate the total volume of topsoil excavated from the hole. $108 m^3$ $378 m^3$ $270 m^3$ $162 m^3$

[Free] Horizontal-axis wind turbines must face into the wind to produce power and, therefore, require some mechanism to constantly realign the rotor during changes in wind direction. A. Horizontal-axis wind turbines B. Vertical-axis wind turbines C. Multidirectional-axis wind turbines D. Diagonal-axis wind turbines