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Questions in engineering

📝 Answered - 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

📝 Answered - 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

📝 Answered - 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

📝 Answered - 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. $108 m^3$ $378 m^3$ $270 m^3$ $162 m^3$

📝 Answered - 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

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

📝 Answered - 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 | | | |

📝 Answered - 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

📝 Answered - To avoid crashing, you can use: a) Evasive steering b) Evasive braking c) Evasive acceleration d) All of the above

📝 Answered - Janice prefers to use a thermocouple temperature sensor to test equipment. How is this type of sensor different from others? A. It can be used to detect temperatures displayed on both analog and digital instruments. B. It's especially useful in measuring pipe temperatures. C. It's highly accurate. D. It's inexpensive and can be carried inside a shirt pocket.