Explain how to properly set a heat anticipator.
What will be an ideal response?
The technician needs to measure the current flowing through the control circuit. This current is very low and needs to be measured using a 10 coil loop of wire from the control circuit. The current of this coil is measured and then divided by 10. The heat anticipator will have a moveable arrow or pointer which the technician has to move to the corresponding amperage.
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What PPE should be worn when handling sheet metal?
A) Gloves B) Self-contained breathing apparatus C) A respirator D) No PPE is necessary to handle sheet metal.
Give the ASTM classification of mortar types and their respective applications.
What will be an ideal response?
Match each item with a statement below.
A. Create light when electricity passes through a tungsten filament encased in glass, causing it to glow and create light. B. Use a filament inside a compact glass envelope filled with gas. C. Create light when electricity passes through gas inside a phosphorous-coated glass tube, causing it to glow. D. Semi-conductors that glow when electrical current passes through them. E. A variation on fluorescent technology that use an electromagnet to cause gas in the lamp to glow. F. A variation on incandescent lamps that are made with mercury vapor, metal halide, and high and low pressure sodium gases.
How are control devices wired in most HVACR circuits?
A) Controls may be wired either series or parallel to the load, depending upon the type of control that is needed B) Controls are typically wired in parallel with the power supply so that they receive full voltage for proper operation C) Controls are typically wired in series with the load they control D) Controls are typically wired in parallel to the load they control