What did the removal of the pilot light, improvement of the heat exchanger, and addition of an induced-draft blower do for the mid-efficiency furnace?
A) It lowered the cost of the unit. B) It increased the cost of the unit by 20 percent.
C) It improved unit efficiency to 80 percent. D) It improved the unit's ease of repairs.
[Ques. 2] Technicians should know that fan speed is directly related to the amount of air a fan can move; therefore, doubling the fan speed will ________ the amount of air flow.
A) increase by 10 percent B) double
C) triple D) increase by 25 percent
[Ques. 3] How can a technician determine a major component failure on a mid-efficiency furnace?
A) The technician can send the control box to the manufacturer.
B) The technician must examine each component to ensure it is operating properly.
C) The technician can use the self-testing feature on the control box.
D) The unit owner must accurately describe how the unit is operating to diagnose component failure.
[Ques. 4] The first step in selecting commercial refrigeration equipment for a new installation is:
A) Compile a list of components already in inventory so that you can see what you will have to choose from.
B) Perform a heat load calculation to determine the required BTU capacity of the system.
C) Compile a list of component prices in order to determine how large a system you can afford.
D) Select the compressor because all other components will be sized to match it.
[Ques. 5] Why are standard low-efficiency furnaces no longer manufactured?
A) The thermocouple flame safety devices they use have not been thoroughly field tested.
B) They cannot provide the minimum 80 percent AFUE required by DOT.
C) The standing pilot flame safety devices were deemed too hazardous after several technicians were electrocuted while changing a thermocouple.
D) Thermocouples proved to be an unreliable technology.
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