Question

4) Which ONE of the following statements is TRUE about a rich fuel-air mixture?
A) Its equivalence ratio and excess air ratio are both greater than one.

B) Its equivalence ratio and excess air ratio are both lower than one.

C) Its equivalence ratio is lesser than one and its excess air ratio is greater than one

D) Its equivalence ratio is greater than one and its excess air ratio is lesser than one.​

Answer 1

Answer:

A

Explanation:

Answer 2

The true statement is (c) Its equivalence ratio is lesser than one and its excess air ratio is greater than one.

Explanation:

Air/fuel ratio: The ratio of air to  solid,liquid or gas fuel present in  combustion mixture  is known as Air/fuel ratio.

Stoichiometric Air /fuel ratio: It is the ratio of required theoretical  air consumption to fuel  consumption  for all available oxygen is used  to burn   the complete  fuel.

Equivalence ratio: The ratio of ratio stoichiometric Air /fuel ratio to

actual air/fuel ratio is known as Equivalence ratio.

• The equivalence ratio is that ratios greater than one always mean there is more fuel in the fuel–oxidizer mixture than required for complete combustion (stoichiometric reaction), irrespective of the fuel and oxidizer being used.

• The equivalence ratio less than one represent a deficiency of fuel or equivalently excess oxidizer in the mixture.

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