September 2 Boiler Foundation Questions **Term Explanations: (A certain score will be given to the top 30)**
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Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. （）
Error; the correct explanation should be as follows: Reverse flow in the water cycle: In tubes that are less heated, the effective head pressure is not sufficient to overcome the resistance in the downward-flowing tubes. As a result, the tubes that originally allowed the fluid to flow upward become tubes through which the fluid flows downward, a phenomenon known as reverse flow
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. (Mistake)
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. (Mistake)
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid originally flowed downward, becomes an upcomer through which the fluid flows upward (incorrect).
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. ( ) Answer: Incorrect
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. (x) Backflow in the water cycle: In tubes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the upcomer, where the fluid used to flow upward, becomes a downcomer through which the fluid flows downward
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. （） Error
Backflow in the water cycle: In pipes that are less heated, the effective head is not sufficient to overcome the resistance in the downcomer; as a result, the downcomer, through which the fluid used to flow downward, becomes an upcomer through which the fluid flows upward. (×)