1) Three way catalytic converters are most effective if the mixture is within (+

Question

1) Three way catalytic converters are most effective if the mixture is within (+/- 1%, +/- 5%, +/- 7%) of a stoichiometric mix.

2) A three way catalytic converter becomes (more efficient or less efficient) at converting CO when the mixture goes from lean to rich.

3) A catalytic converter based on platinum with a rhodium promoter has a light off temperature that is (higher, about the same as, or lower) compared to platinum by itself.

4) In the Lean NOx trap type of catalytic converter, rich operation after a period of lean operation, converts barium nitrate to barium carbonate. (true or false)

Explanation / Answer

1. +7%
2. more efficient
3. Lower

4. True

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