As an operational safety check, the equipment rooms for combustion appliances should be checked for high:
A) Carbon monoxide levels. B) Nitrogen levels.
C) Oxygen levels. D) Carbon dioxide levels.
A
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The component labeled 7 in Figure 1 is a(n) _____.
a. end seal b. power connection c. splice/tee connection d. thermostat
En la Figura 1, si R3 se retirara del circuito, una corriente de _____ amperios fluirÃa por el circuito.
a. 12
b. 4
c. 15
d. 5
What was the most commonly used refrigerant gas for geothermal pumps for almost one hundred years?
a. chlorofluorocarbons (CFCs) c. carbon dioxide (CO2) b. hydrogen sulfide (H2S) d. methane (CH4)
What is a redundant gas valve?
A) A gas valve that was once necessary on older furnaces but is no longer used B) A gas valve with two valves mechanically in series C) A gas valve that is used in case the main valve quits working D) A gas valve that has no real purpose