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Questions in engineering

[Jawaban] 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

[Jawaban] 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

[Jawaban] 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

[Jawaban] 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

[Jawaban] 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

[Jawaban] 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. $108 m^3$ $378 m^3$ $270 m^3$ $162 m^3$

[Jawaban] 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

[Jawaban] Common sill problems include all of the following except: A. sagging B. rot C. crushing D. poor anchoring E. gaps under sills

[Jawaban] Carolyn is charging a system that has a fixed-restriction metering device. She has decided to use the superheat method. Using the chart, she knows that the indoor wet-bulb temperature is 66 degrees Fahrenheit and that the outdoor ambient temperature is 90 degrees Fahrenheit. What's the required superheat? | Indoor WB | 55 | 60 | 65 | 70 | 75 | 80 | 85 | 90 | 95 | 100 | 105 | |---|---|---|---|---|---|---|---|---|---|---|---| | 50 | 9 | 7 | | | | | | | | | | | 52 | 12 | 10 | 6 | | | | | | | | | | 54 | 14 | 12 | 10 | 7 | | | | | | | | | 56 | 17 | 15 | 14 | 10 | 6 | | | | | | | | 58 | 20 | 18 | 16 | 13 | 9 | 5 | | | | | | | 60 | 23 | 21 | 19 | 16 | 12 | 8 | 6 | | | | | | 62 | 26 | 24 | 22 | 19 | 16 | 12 | 8 | 5 | | | |

[Jawaban] Floor structures may experience what kinds of loads? A. Live and dead loads B. Compression loads C. Live loads only D. Horizontal loads only E. Vertical loads only