Explain why leak testing a system is often one of the most difficult tasks a service technician can face.
What will be an ideal response?
The leak can be anywhere along the piping circuit. Often, the entire piping arrangement is not accessible, making the process difficult. Leaks can be present deep within the heat transfer coils, such as the evaporator or condenser, or they can be located behind sealed walls and ceilings.
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All of the following statements are true EXCEPT:
A. the release bearing is lubricated and then sealed at the factory. B. self-centering release bearings are used on front-wheel-drive cars because they do not use a pilot bearing in the crankshaft. C. curved release levers go against curved bearings, and flat release levers go against flat bearings. D. some release bearings are flat on their face and others are curved.
Repeat Problem 15-1 for an urban freeway in rolling terrain.
What will be an ideal response?
Identify the incorrect statement in regards to engine water pumps.
A. The water pump is a positive displacement centrifugal pump. B. The water pump is a non-positive centrifugal pump. C. Coolant leaving the water pump flows first through the engine block and cylinder head and then into the radiator and back to the pump. D. Water pumps are either belt or gear driven.
Technician A says that engines using quiescent combustion dynamics tend to use more aggressive Mexican hat cones. Technician B says that injected fuel droplets are directed into the crater (toroidal recess) in Mexican hat piston crowns. Who is correct?
A. Technician A only B. Technician B only C. Both A and B D. Neither A nor B