If the air inlet to a centrifugal fan is restricted:
A) The fan RPM will decrease. B) The fan operation will be unaffected.
C) The fan motor current draw will increase. D) The fan motor current draw will decrease.
[Ques. 2] What is the purpose of the door switch on a walk-in freezer?
A) To energize the interior heaters to make the case a more comfortable temperature
B) To turn on the system to offset the added heat from opening the door
C) To turn on the light in the case when the door is opened
D) To prevent warm air from entering the case by shutting off the fans when the door is opened
[Ques. 3] How does the standing-pilot system provide a safety check for the continually lit pilot?
A) The pilot runner impinges on the flame.
B) The pilot flame impinges on the thermocouple.
C) The pilot flame is located on a runner leading to the burners.
D) The pilot flame has no safety check.
[Ques. 4] The two broad types of fan designs are:
A) Forced draft and induced draft. B) Propeller and squirrel cage.
C) Forward-curved and backward-curved. D) Centrifugal and axial.
[Ques. 5] In all furnace cabinet configurations, the return air:
A) Enters as combustion air, travels through the heat exchanger, and exits the fan end of the furnace.
B) And combustion air enter the furnace through the same opening.
C) Enters at the fan housing end and exits the heat exchanger end of the furnace.
D) Enters at the heat exchanger end and exits the fan housing end of the furnace.
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