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Questions in engineering

[Answered] Select the best answer for the question. 11. Leak detectors can be used with systems that are charged only with nitrogen. A. Corona discharge electronic B. Ultrasonic C. Heated diode electronic D. Infrared

[Answered] Select the best answer for the question. What's the minimum velocity in a horizontal suction line for most systems? A. 3,000-3,500 ft per minute B. 500-750 ft per minute C. 750-1,000 ft per minute D. 1,000–1,500 ft per minute

[Answered] Which of the following systems would be most likely to produce a power waveform that would require a true RMS meter to accurately measure? A. A shaded-pole motor controlled by a relay B. An electric strip heater controlled by a contactor C. A three-phase motor controlled by a variable-frequency drive D. An incandescent light controlled by a toggle switch

[Answered] Place the steps of flaring copper tubing in the correct order: A. Turn the handle until the tool completes the process and loosen the clamps. B. Center the flaring cone over the pipe and tighten. C. Cut the copper tube with a tube cutter. D. Smooth the cut-in. E. Stick the pipe into the correctly sized clamp and tighten.

[Answered] Area [tex]A=30 m \times 12 m=360 m^2[/tex] Depreciation Factor [tex]=1.3[/tex] Utilisation Factor [tex]=0.5[/tex] Assume mounting height [tex]=6 m[/tex] Gross lumens required [tex]\phi=\frac{A \times E}{U F \times M F}[/tex] [tex]\begin{array}{l}=\frac{A \times E \times D F}{U F} \\=\frac{360 \times 50 \times 13}{0.5}=46800 lcmen\end{array}[/tex] If 100 watts are used, # of lamps required [tex]=\frac{46800}{1615}[/tex] [tex]=29 lamps[/tex]

[Answered] Select the best answer for the question. 16. All AC equipment is designed to operate at voltages within A. 10 B. 15 C. 25 D. 20 percent of its rated power.

[Answered] If gear A has 50 teeth and runs at 40 rpm and is used in driving gear B with 25 teeth, at what speed will gear B be moving?

[Answered] Choose all options that apply. Which factors most directly affect the maximum allowable pressure drop within a system? a) Type of refrigerant b) Gas velocity c) Temperature of the refrigerant d) Pipe size

[Answered] Select the best answer for the question. 18. How is the minimum circuit ampacity for an air-conditioning condensing unit calculated? A. Compressor amps [tex]\times[/tex] fan amps B. ([tex]Compressor amps + fan amps) \times 1.25[/tex] C. Compressor amps + fan amps D. ([tex]Compressor amps \times 1.25[/tex])+ fan amps

[Answered] Which of the following is the best definition of a vehicle's axle group spread? A. The distance separating two axles or axle groups calculated from the centres of the two adjacent axles B. The distance between the centre of the front axle (or front axle group) to the centre of rear axle group on either your tractor or trailer C. The distance between the axles within an axle group and is measured from the centre of the first axle to the centre of the rear axle in the group