Which of the following occurs when the flue gases are pushed back into the combustion chamber?
a. reverse draft
b. dilution air
c. natural draft
d. mechanical draft
ANSWER: a
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Indicate whether the statement is true or false.
The MPN is the result of which of the following laboratory tests?
a. membrane filter b. fermentation tube c. biochemical oxygen demand d. dissolved oxygen e. turbidity
What are some differences between a flake ice machine and a cube ice machine?
A) The flake ice machine does not have a bin control or a photo-electric eye like a cube ice machine. B) The flake ice machine has a vertical cylindrical evaporator and makes ice continuously, while the cube ice machine has a horizontal rectangular evaporator and makes ice in cycles. C) The flake ice machine has the same safety devices as the cube ice machine, as no additional safety devices are needed. D) The flake ice machine has a horizontal rectangular evaporator and makes ice in cycles, while the cube ice machine has a vertical cylindrical evaporator and makes ice continuously.
The disconnect switch for the unit:
A) Can be the breaker in the power distribution panel feeding the furnace circuit. B) Should be located within sight of the furnace. C) Should be attached to the furnace cabinet. D) Should be located in an easily accessible location, like a utility closet or garage.