ASE SMS Questions and Explanations:


The correct answer is D. A leaking turbocharger impeller shaft seal will allow oil to be pulled into the engine intake manifold resulting in oil consumption. Options A, B, and C will not cause an oil consumption concern.



The correct answer is C. When the transmission is put in gear, the engine is loaded and the noise stops.  Low engine oil pressure could cause a noise at all times. Noise from worn valve lifters or a broken rocker arm/cam follower would not stop when the engine is loaded. A broken flywheel flexplate could be loose when there is no load on the engine resulting in a noise, but could then bind when the engine is loaded causing the noise to stop.



The correct answer is C. Trucks/ trailers are known by their hitch. The name is a contraction of 'semi-oscillating turntable hitch. It's a semi-oscillating hitch because it only allows oscillation in those two planes. It was the trailer that gave rise to the name semitruck. Since the trailer has no front wheels and can be used only when connected to the tractor part of the truck, it's called a semi-trailer.



The correct answer is A. Some systems also monitor the spare tire, so low pressure in the spare could cause the light to illuminate. Technician A's statement is true. It doesn't matter if regular air or nitrogen is used to fill the tire to the proper pressure. Technician B's statement is false.