$1.$ In combustion, the necessary components include $\_\_\_\_\_,\_\_\_,$ and $\_\_\_\_\_$ to initiate and sustain the reaction.

A$)$ fuel, oxygen, heat

B$)$ water, oil, light

C$)$ wood, nitrogen, spark

$2.$ Pulverized coal burners are preferred over stokers because they provide better $\_\_\_\_\_,\_\_\_,$ and $\_\_\_\_\_$ control.

A$)$ heat distribution, fuel efficiency, emission

B$)$ color consistency, particle size, temperature

C$)$ vibration, noise, combustion rate

$3.$ The main environmental advantage of fluidized bed combustion is its ability to reduce $\_\_\_\_\_,\_\_\_,$ and $\_\_\_\_\_$ emissions.

A$)$ sulfur dioxide, nitrogen oxides, particulates

B$)$ carbon monoxide, hydrogen, methane

C$)$ oxygen, carbon dioxide, argon

$4.$ Stoichiometry in combustion is crucial for determining the correct ratio of $\_\_\_\_\_,\_\_\_,$ and $\_\_\_\_\_.$

A$)$ fuel, oxygen, inert gases

B$)$ carbon, hydrogen, nitrogen

C$)$ wood, paper, plastic