Why do large ammonia chillers in large scale food processing plants often use a glycol secondary refrigerant?
A) To maintain a lower compression ratio
B) To maintain a higher compression ratio
C) To achieve low temperatures because ammonia will not reach sub-freezing temperatures alone
D) To avoid ammonia spills by limiting the ammonia charge to the chiller
D
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Answer the following statement true (T) or false (F)
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Indicate whether the statement is true or false
When fresh plant residues are added to soils, the "priming effect" may result in the decomposition of:
A) lignin and cellulose. B) proteins and other nitrogen-rich compounds. C) sugars and starch. D) waxes and fats. E) stable humus.
When the positive lead of a diode is connected to the positive side of a circuit, it is called ___________
A) Reverse bias B) Negative bias C) Forward bias D) None of these