The plastic or foil sleeve on the outside of a branch duct in a crawl space serves as _____
A) thermal insulation
B) a vapor barrier
C) a noise suppressor
D) a fire retardant
Answer: B
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In a pressure type of flame sensor, a ____-filled bulb is located in the pilot flame.
a. solvent b. mercury c. refrigerant d. solution
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Which of the following could result in abnormally high manifold boost on an engine with a VGT turbocharger?
A. sticking VGT vane ring B. retarded injection timing C. plugged charge air cooler D. restricted DPF
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According to Petersen’s Accident/Incident Theory, systems fail because