How does air flow in a standing-pilot, natural-draft system?
A) It relies on heat to decrease the convection of the air to pull air into the combustion chamber and force flue-gases into the proper vent.
B) It relies on a fan to pull the air into the combustion chamber and blow flue-gases out.
C) It relies on heat to pull air into the combustion chamber and a fan to remove flue-gases.
D) It relies on heat to increase the buoyancy of the air to pull air into the combustion chamber and force flue-gases into the proper vent.
D
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Answer the following statement(s) true (T) or false (F)
1. It is true that time elapses during nearly every action taking place on a machine. This fact means that a timer is always the best means of control. 2. Time-delay relays have a normally open and a normally closed timing contact. 3. The manual-set timer requires manual operation of the timer to start and stop operation. 4. The main difference among temperature switches is the means by which the temperature information is transferred from the sensing element to the switching element. 5. The actual temperature in an on/off system will always fluctuate about some value.
Why is clipping of needle teeth performed on baby pigs?
What will be an ideal response?
____________________________ heat pumps utilize two coaxial heat exchangers, as compared to only one on the water-to-air configuration.
Fill in the blank(s) with the appropriate word(s).
Topographic features can be found on the _____
a. elevation drawings b. section drawings c. mechanical drawings d. civil drawings