In most commercial air handlers:
A) The blower and coil are located in separate component parts of the system.
B) The blower forces the air across the coil.
C) The air passes through the unit twice: once for the blower and another time for the coil.
D) The blower draws the air across the coil.
[Ques. 2] The temperature difference between the temperature of the cold water leaving the cooling tower and the wet-bulb temperature of the air entering the tower is known as:
A) Approach. B) Wet-bulb depression.
C) Heat load. D) Cooling range.
[Ques. 3] The temperature difference between the hot water entering the tower and the cold water leaving the tower is known as:
A) Approach. B) Heat load.
C) Wet-bulb depression. D) Cooling range.
[Ques. 4] What is the difference between primary air and secondary air?
A) Primary air is used for the main burner and secondary air is used for the auxiliary burners.
B) Primary air is mixed with the gas before ignition and secondary air is drawn in after ignition.
C) Secondary air is only used if the primary air source is depleted.
D) Primary air is used with natural gas and secondary air is used for LP gas.
[Ques. 5] When an air handler has both a DX cooling coil and a hot water heating coil, which coil is located first in the airstream?
A) The two coils are in different airstreams.
B) The DX cooling coil
C) The hot water heating coil
D) The air does not travel over the hot water heating coil.
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