A __________ receptacle is one that has internal shutters that are closed behind the receptacle slots when there is no attachment plug inserted. The shutters open when a plug is inserted allowing the plug (and cord) to become energized.
a. duplex
b. single
c. tamper-resistant
d. GFCI
c. tamper-resistant
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It is possible to determine the extent of contamination of a weld with a visual inspection alone.
Answer the following statement true (T) or false (F)
Every year, animals produce more offspring than is necessary to continue the species, this is called the _____
a. hunting limit b. biological surplus c. overpopulation d. disease barrier
How do mixing valves save energy?
A) By mixing costly boiler water with inexpensive domestic hot water B) By maintaining a hot loop regardless of outdoor temperature C) By delivering only enough heat to the loop to meet the load D) By reusing loop water for domestic hot water
The most efficient operation is achieved with:
A) Thermostatic expansion valves. B) Orifice-type metering devices. C) Automatic expansion valves. D) Capillary tubes.