How is a moisture sensor probe able to detect the amount of water present in a potting medium? Under what conditions might it give a false reading?
What will be an ideal response?
An electrical water sensor measures the electrical conductivity of the soil. The more water present, the more ions will be dissolved in the soil and the greater the electrical conductivity, indicating more water. It might give a false reading if the nutrients level is extremely high because the elevated level of nutrients would indicate the presence of more water than is actually in the soil.
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PROBLEM 2.22 For the steel truss and loading shown, determine the deformations of the members BD and DE, knowing that their cross-sectional areas are 2 in2 and 3 in2, respectively.
Which is normal flow in a cooling coil?
A) Crossflow, which is water in on the entering air side. B) Counterflow, which is water in on the leaving air side. C) Crossflow, which is water in on the leaving air side. D) Counterflow, which is water in on the entering air side.
The HVAC system is also referred to as the:
A. heating system B. mechanical system C. recovery system D. all of the above E. none of the above
During the setup of GTAW equipment, what must be connected to the workpiece?
a. The tungsten electrode lead b. The workpiece lead c. The shielding gas nozzle d. The primary disconnect