Why don't variable-air-volume zone systems need any method of controlling excess air?
A) The fans used are not capable of producing excess air.
B) Any excess air is automatically diverted outside.
C) All the dampers pass a little air, even when they are closed.
D) They reduce the system airflow to match the number of zones calling.
D
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A cubic meter is equal to _____.
a. 1,000 dekaliters b. 142.6 gallons c. 750 quarts d. 1,000 liters
Many late model vehicles use a(an) ________ to help clean the air in the vehicle.
A) Cabin filter B) Condenser filter C) Drip system D) None of these
Which of the following is not a temperature sensor?
A) thermocouple B) triac C) thermistor D) resistance temperature detector
Why must condensate pumps used with condensing furnaces be approved for furnace condensate use?
A) The condensate from a furnace is mildly acidic and can damage the materials in some condensate pumps. B) The condensate from a furnace is flammable and only furnace-rated condensate pumps can pump flammable liquid. C) The condensate from a furnace is mildly alkaline and can damage the materials in some condensate pumps. D) The furnace manufacturer will void the warranty if the wrong condensate pump is used.