Free Exhaust System MCQ Question and Answers

Question 1

In order to __________, engine exhaust pipes are coated with insulating material.

Accepted Answer

Reduce heat transfer

Answer

Increase engine efficiency

Answer

Conserve heat

Answer

Keep the exhaust pipe warm

Question 2

The use of a three-way catalytic converter

Accepted Answer

Reduce nitrogen oxide, hydrocarbon and carbon-di-oxide emission levels

Answer

Burn fuel vapour

Answer

Remove carbon di-oxide, hydrocarbon and nitrogen oxide from the exhaust gases passing through it

Answer

Re-circulate exhaust gases

Question 3

Recirculating exhaust gas has the disadvantage of

Accepted Answer

Increasing HC emission

Answer

Increasing aldehydes

Answer

None of the above

Question 4

When "back pressure" increases, fuel consumption will __________.

Accepted Answer

Increases

Answer

Decreases

Answer

Remain unaffected

Answer

Depend on the factor

Question 5

What kind of material is utilized to make exhaust manifolds?

Accepted Answer

Cast iron

Answer

Aluminum alloy

Answer

Steel

Answer

Copper

Question 6

The following emissions are not under control by the three-way catalytic converter.

Accepted Answer

PM session

Answer

HC emission

Answer

NOx emission

Answer

CO emission

Question 7

EGR is the best method for lowering emissions of

Accepted Answer

NOx

Answer

CO

Answer

CO and HC

Answer

HC