Question

QUESTION 2

After two technicians examine a broken and disintegrated DPF, Technician A says that the filter damage was caused by water
contamination of an ash-loaded filter. Technician B says that the filter was damaged by back-to-back regenerations that occurred
too frequently. Who is correct?
O a. Technician A
O b. Technician B
O c. Both Technician A and Technician B.
O d. Neither Technician A nor Technician B
QUESTION 3
Technician A says that the diesel exhaust oxidation catalysts used by diesel engines are like the ones that have been used in
automobiles for the last 2 decades. Technician B says that diesel exhaust oxidation catalysts store noxious emissions in the substr
when the exhaust temperatures are low. Who is correct?
O a. Technician A
O b. Technician B
O c. Both Technician A and Technician B
O d. Neither Technician A nor Technician B

Answer 1

2:C 3:B

Step-by-step explanation:

2. It is difficult to determine who is correct without additional information or context about the situation. Both Technician A and Technician B offer plausible explanations for the cause of the filter damage, and it is possible that both factors contributed to the problem. Therefore, the correct answer is (c) Both Technician A and Technician B.

3. Technician B is correct. Diesel exhaust oxidation catalysts do store noxious emissions in the substrate when the exhaust temperatures are low. This is known as "cold start emissions," and the stored emissions are later released when the catalyst reaches its operating temperature. Technician A is incorrect in stating that diesel exhaust oxidation catalysts are like the ones used in automobiles for the last 2 decades, as diesel engines have different emissions profiles and require different types of catalysts. Therefore, the correct answer is (b) Technician B.