In 2004, what system became a requirement on highway compliant diesel engines to meet tough emissions standards?
A. Diesel particulate filters (DPFs).
B. Selective catalytic reduction (SCRs).
C. Positive crankcase ventilation (PCV).
D. Exhaust gas recirculation (EGR).
Answer: D
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What will be an ideal response?
All of the following statements are true EXCEPT:
A. catalytic converters can become plugged if they operate for a prolonged period when there is a misfire. B. as a general rule, exhaust backpressure should not exceed 3.75 psi at wide-open throttle (WOT) under full load. C. a rich air-fuel mixture can result in a plugged converter when it overheats and melts internally. D. exhaust backpressure can be tested by removing the oxygen (O2) sensor and connecting a pressure tester using a special fitting.
____ control valves are not used for high pressure application.
A. Single-seated B. Double-seated
____ amplifiers amplify AC signals in the frequency range of approximately 20 to 20,000 hertz.
A. Audio B. DC C. RF D. IF