When troubleshooting an induced draft gas furnace, what should be checked if the induced draft fan comes on but the igniter is never energized?
A) Check the control transformer.
B) Check the microamp signal of the flame sensor.
C) Check the incoming gas pressure.
D) Check the draft pressure switch to see if it is closed.
D
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Which of the following equations is correct to calculate latent heat flow by air?
A) Q = 500 * GPM * ?T B) Q = 4.5 * CFM * ?H C) Q = 1.1 * CFM * ?T D) Q = 4840 * CFM * ?W
Which term best describes the system concept that a system that does not interact with its
external environment will die?
a. Entropy b. Synergy c. Subsystem interdependence d. Equifinality e. None of these
Metal bridging is placed at the center of spans over 10 feet and where the joists pass over the girder. Determine the number of pieces of metal bridging needed for the floor in Figure 14.61.
What will be an ideal response?
Technician A says that riveted disc brake pads are often quieter that bonded disc brake pads. Technician B says that integrally molded disc brake pads are molded into holes in the steel backing of the pads. Which technician is correct?
A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B