What visual clues on a system can indicate the presence of a refrigerant leak?
A) Oil stains around the area of the leak
B) A greenish stain around the area of the leak
C) A visible cloud of refrigerant in the area of the leak
D) Refrigerant bubbles forming around the leak
A
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What minimum rate of financial return do the authors consider necessary to justify most brush control projects?
A) 10% B) 5% C) 25% D) 13% E) 18%
When an inversion valve is activated, which of the following occurs?
A. some hold-off air is exhausted B. service air is dumped C. tractor protection valve closes D. park/emergency circuit brakes are fully applied
What is the place value of 2 in the number 123,456?
a. hundreds b. thousands c. ten thousands d. hundred thousands