Question

technician a says that the octane rating of gasoline is the measure of its antiknock properties. technician b says that normal combustion occurs smoothly and progresses across the combustion chamber from the point of ignition. who is correct? a) neither technician a nor b b) both technicians a and b c) technician a d) technician b question 15 (5 points) two technicians are discussing the waste - spark system. technician a says that it fires one cylinder while its piston is on the compression stroke and into paired or companion cylinders while its on the exhaust stroke. technician b says that waste - spark ignitions require a sensor (usually a crankshaft sensor) to trigger the coils at the correct time. who is correct? a) technician b b) both technicians a and b c) technician a d) neither technician a nor b

Explanation:

Question (First Technician Question)

• For Technician A: Octane rating indeed measures gasoline's antiknock properties (resistance to engine knocking).
• For Technician B: Normal combustion in an engine does occur smoothly, propagating from the ignition point across the combustion chamber. So both statements are correct.

• Technician A: In a waste - spark system, one cylinder is on the compression stroke (where the spark ignites the fuel - air mixture) and the paired cylinder is on the exhaust stroke (where the spark is “wasted” as there's no fuel - air mixture to ignite), so this description is correct.
• Technician B: Waste - spark ignitions need a sensor (like a crankshaft sensor) to determine the correct timing to trigger the ignition coils, so this statement is also correct. Thus, both technicians are correct.

Answer:

B) Both Technicians A and B

Question (Second Technician Question)