Why do air-source heat pumps usually require auxiliary heat?
A) Because air-source heat pumps break down a lot
B) Because the heating capacity of the unit drops as house heating requirements increase
C) The heat pump compressor will not start in cold weather unless it is first warmed up
D) The heat that a heat pump "pumps in" must first be provided by an auxiliary heat source
B
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Technician A says that a good engine brake can replace the air brakes on most trucks today. Technician B says that a disadvantage of the internal engine brake is that they consume a lot of fuel during braking cycles. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B
An ATC system has the ability to automatically ________.
A) Change the function door setting B) Move the temperature-blend door C) Adjust the blower speed D) All of these
The NRTL program specified in the Code of Federal Regulations ____.
A. regulates training standards B. regulates labor standards for electrical contractors C. accredits and regulates independent laboratories D. accredits electrical material manufacturing facilities
A semiconductor with a negative temperature coefficient
A) exhibits an increase in resistance as temperature increases. B) exhibits zero resistance at temperatures below 0°C. C) exhibits a negative resistance at temperatures below 0°C. D) exhibits a decrease in resistance as temperature increases.