Thermostats with bimetal sensing elements typically use a combination of copper or brass and _____.
a. Elinvar®
b. nickel
c. Invar®
d. aluminum
c. Invar®
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____________________ are mixtures of two or more metals.
Fill in the blank(s) with the appropriate word(s).
The substance that is used as the constant common material to measure specific gravity of solids is:
A) Air in a vacuum @ 29.9 in Hg. B) Ice @ standard conditions. C) Water @ standard conditions. D) Air at standard conditions.
Why are the EGR gases cooled before entering the engine on some engines?
A) Cool exhaust gas is more effective at controlling NOx emissions B) To prevent damage to the intake valves C) To prevent heating the air-fuel mixture in the cylinder D) To help prevent the exhaust from slowing down
Technician A says structural foam is used to reduce the NVH on the vehicle. Technician B says repair mapping may occur if plastic filler is overcatalyzed. Who is correct?
A. Technician A only B. Technician B only C. Both Technicians A and B D. Neither Technician A nor B