What is the purpose of the labyrinth seal (drum groove) used on a drum brake?
A) Keeps water out of the drum B) Reduces cooling
C) Reduces noise D) Allows the shoes to collect dust
C
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Oil fouled spark plugs are an indication that the _________ may be plugged up.
A. crankcase breather B. exhaust port C. purge control valve D. fuel injectors
Some insects live off of other animals in a relationship called ______________________
Fill in the blank(s) with correct word
The recovery level for Type III systems using a recovery device manufactured after November 15, 1993, is:
A) 25 in Hg vacuum. B) 4 in Hg vacuum. C) 25 mm absolute pressure. D) 0 psig.
A low-velocity fastening system that is used to drive steel pins or threaded studs into masonry and steel is a(n)
_____. a. pneumatic screw nailer b. powder-actuated tool c. air impact wrench d. mini hammer drill