Marine Boiler Construction A8

What is the primary function of the furnace in a fire-tube boiler?

• To collect the steam produced.

• To preheat the feedwater.

• To burn fuel and generate hot combustion gases.

• To circulate water between drums.

In a fire-tube boiler, where is the water contained?

• In the fire tubes.

• In the steam drum.

• In the cylindrical outer shell.

• In the smoke box.

What is the primary feature of a water-tube boiler?

• Hot gases pass through tubes surrounded by water.

• It uses a single drum at the bottom.

• Water circulates through a network of tubes with hot gases flowing around them.

• It can only be used for low-pressure steam.

What is the purpose of a superheater in a water-tube boiler?

• To collect the steam produced.

• To preheat the feedwater.

• To remove solid impurities from the water.

• To further heat steam to increase its temperature before use.

What is the function of an economizer?

• To recover heat from exhaust gases to preheat feedwater.

• To increase the temperature of steam.

• To collect steam in the steam drum.

• To burn fuel for combustion.

In a fire-tube boiler, what passes through the fire tubes?

• Water

• Steam

• Hot combustion gases

• Feedwater

In a water-tube boiler, where is the steam collected?

• In the water drum.

• In the economizer.

• In the superheater.

• In the steam drum.

What is the key characteristic of an exhaust gas boiler?

• It uses a separate burner for fuel combustion.

• It generates steam from the heat of hot exhaust gases.

• It is designed to handle very high-pressure steam.

• It has a cylindrical outer shell with fire tubes.

What is a key characteristic of a composite boiler?

• It uses a single heating source.

• It can use both engine exhaust gases and separate burners.

• It only has water-tube elements.

• It is designed to only produce low-pressure steam.

What is the purpose of a bypass system in an exhaust gas boiler?

• To preheat feedwater.

• To circulate water between the drums.

• To allow exhaust gases to bypass the boiler when steam is not needed.

• To release excess pressure.