The advantage of the backward-curved centrifugal fan over the forward-curved centrifugal fan is that:
A) Backward-curved fans operate at lower RPM.
B) Backward-curved centrifugal fans are well suited for small airflow quantities.
C) Backward-curved fans are normally quieter in operation.
D) Backward-curved fans are non-overloading.
D
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Which of the following is an NEC® requirement for grounding and bonding cable tray installations?
a. Only single conductor cable may be used in cable trays used as equipment grounding conductors. b. Nonmetallic cable trays must be bonded with flexible bonding jumpers. c. Steel or aluminum trays may be used as equipment grounding conductors. d. Metal cable tray does not require bonding.
The most common type of assembly that is used in a set of working prints is:
a. working print assembly b. general assembly c. erection assembly d. layout assembly
Soil organic matter consists of ________
A) polymerized, non-identifiable molecules B) dead tissues and wastes C) identifiable biomolecules D) living organisms and cells E) all of the above
Independent service facilities often provide in-service training for their technicians
Indicate whether the statement is true or false