Which is mixed with fuel in the burner prior to combustion?
A) propane B) oxygen C) primary air D) superheated air
C
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Answer the following statement(s) true (T) or false (F)
1. A very common and reliable method for sensing temperature is by the evaporation of metal. 2. One very common device that operates on the principle of expansion and contraction of metal is the line voltage thermostat. 3. The shorter the bimetal strip is, the more movement that will be produced by a change of temperature. 4. The amount of voltage produced by a thermocouple is small. 5. Thermistors are thermally sensitive semiconductor devices.
A feeder circuit with no motor load has a continuous load of 10A and a noncontinuous load of 10A. The feeder overcurrent protective device should be sized at _____.
a. 12.5A b. 20A c. 22.5A d. 27.25A
La herramienta que se muestra en la figura provista se utiliza para:
a. roscar tubos.
b. doblar tubos.
c. soldar uniones de tubos.
d. biselar tubos.
Which of these is NOT a reproductive or sexual characteristic of a female?
a. presence of secondary characteristics, such as snood in turkeys and antlers in deer b. maternal behavior c. libido d. production of ova