To make sure that the demand for steam is properly met, the supply of fuel and air to the boiler must be adjusted to reflect changers in the boiler load.

• true

• false

What is the function of the burners in boilers?

• Burners inject a mixture of fuel and air into the combustion area of a boiler.

• Burners are needed to change the liquid oil to a mist.

• Burners transfer heat through electromagnetic waves

What is the function of the spuds in a typical gas burner?

• inject gas into the burner

• cause the air entering the burner to swirl, thus mixing thoroughly with the fuel

• regulate the amount of air that enters the burner

• start the burning process

What is a fire-tube boiler? 

• hot gases go into water, creating a mixture of exhaust and steam
• hot gases pass through a water pipe that provides heat to the surroundings
• hot gases pass through fire-tubes, which continue to the burner
• hot gases pass through steel tubes surrounded by water, and the water is thus heated by the hot gases

What is a water-tube boiler?

• water is passed through steel tubes surrounded by exhaust (gases), and the water is then heated by the hot gases
• hot gases pass through tubes surrounded by water, and the water is thus heated by the hot gases
• water runs through the boiler and out the safety valves
• water is outside the pipes and is heated up by the exhaust (gases)

What is the function of the impeller?

• inject gas into the burner

• cause the air entering the burner to swirl, thus mixing thoroughly with the fuel

• regulate the amount of air that enters the burner

• start the burning process

What is the function of dampers in a typical gas burner?

• inject gas into the burner

• cause the air entering the burner to swirl, thus mixing thoroughly with the fuel

• regulate the amount of air that enters the burner

• start the burning process

Heat flows

• HOT TO COLD
• COLD TO HOT
• COLD TO WARM TO HOT
• RISES

HOW IS HEAT ENERGY TRANSFERRED BY PHYSICAL CONTACT

• CONDUCTION

• CONVECTION

• RADIATION

• INDUCTION

What is it called when warm air rises and cool air falls?

• convection

• radiation

• conduction

• heat