According to NEMA definitions, which of the following is a type of open motor?
a. Nonventilated
b. Explosion-proof
c. Weather-protected
d. Water-to-air-cooled
c. Weather-protected
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Why are centrifugal compressors the most common in process industries?
A) They deliver lower flow rates B) They are more economical C) They take up more space D) They have a higher capacity
The common yellowthroat is _____
a. nonmigratory b. originally from Europe c. a ground nester d. secretive and is heard more often than seen
The parent materials for most coastal plain soils are residual in nature
Indicate whether the statement is true or false
Which of these statements about knock sensors is correct?
A. The sensor generates a voltage signal B. The sensor generates a frequency signal C. The sensor is located in the cylinder head D. On V-type engines, one sensor is used