A double insulated drill ____.
A. has two ground wires to insure proper grounding
B. generally has a plastic case with the electrical connections and motor insulated within the tool
C. is used with a three- to two-prong adapter
D. has rechargeable batteries
Answer: B
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Technician Parker began the day with a 
?ft. roll of cable. His first job required 
ft. of the cable. Parker used
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Both GMA and ____ can produce excessive spatter when the welding voltage and amperage are not set within the electrode manufacturer's specifications.
A. GFC B. FCA C. GTA D. FOW
Branch ducts using flexible duct should not be longer than _____.
a. 3' (0.9 m) b. 6' (1.9 m) c. 8' (2.4 m) d. 12' (3.7 m)
Answer the following statement(s) true (T) or false (F)
1. Relay contacts are designated as normally open, or normally closed. In this context, the word “normally” means when the coil of the relay is not energized. 2. There are hydronic heating applications where control action is required based on the difference between two temperatures rather than the value of either temperature. 3. A multizone relay center is designed to isolate the wiring and control operation of several independent zone circulators or zone valves. 4. One purpose of mixing is to protect conventional boilers from operating at conditions that allow sustained flue gas condensation. 5. Direct injection mixing, whether accomplished using a two-way valve or variable-speed pump as the injection control device, provides the highest temperature difference between the supply and return injection risers.