2Nd Class Fireman, High Pressure Boilers, Chapter 2, Exam Q&a

If the boiler is generating 20,000 lb/hr of steam, it must be supplied with ____ lb/hr of feedwater

From the deaerator, oxygen and other noncondensable gases are separated from the feedwater and directed to the atmosphere _____

A(n) _____ is a system of measuring instruments and controllers that work together to control a process

One pound of water is needed to produce ____ of steam

In a low-pressure gas system, the ____ valve is an electric valve that can’t be opened until the gas pilot is lit

_____ are used for loads that require dry steam, such as turbines

In a feedwater system, the ____ valve is located closest to the shell of the boiler on the feedwater line so that the check valve can be repaired without draining (dumping) the boiler

A steaming boiler can have the water in the gauge glass go from half full to empty in a matter of _____ if water is not added to the boiler

In a fuel oil system, the purpose of duplex strainers is to ____

Superheated steam has more ____ than saturated steam at the same pressure

The deaerator tank is located ____

A gas pilot line on a high-pressure gas system supplies gas through a _____ valve to the pilot gas pressure regulator

The purpose of any fuel oil system is to supply fuel oil to the burner at the proper ____

Number _____ fuel oil needs to be heated before it is pumped so that it can flow

Pulverizing coal allows ____

Draft is _____ caused by a difference in pressure between two points

Natural draft is the result of temperature difference between ____

In a low-pressure gas system, the air mixes with the gas in the _____

A measuring instrument can use a ____ to send a signal to a controller

Pulverized coal is ground into a fine powder and blown into the combustion chamber where it is burned in ____

A control system uses a ____ to execute a control strategy

Water weighs approximately ____ lb/gal

Induced draft is produced by pulling air through the boiler furnace with a fan located in the ____

A control loop uses a ____ as the control element

Codes may require that a(n) ____ be positioned before the firing-rate valve that controls the volume of gas to the burner

Feedwater is typically pumped into a(n) ____ where it is heated to a relatively high temperature by the gases of combustion discharged from the boiler.

_____ is produced by a fan supplying air to the furnace

Boiler instruments consists of devices used to measure ____, opacity, and other process conditions

A ____ contains a primary element, a control element, and a final element

____ is a clean, minimally polluting fuel that requires no storage and is readily available in most areas.

Which four separate systems must function in order for a steam boiler to operate? _____

_____ is the vapor that forms when water is heated to its boiling point.

In a steam system if the pressure controls fail, a _____ is a last resort to control the pressure.

A _____ is used when multiple boilers are in battery.

As steam gives up its heat, it ____

Any time there is a reduction in steam pressure through a pressure-reducing station there must be a _____

_____ is water supplied to a boiler.

A(n) _____ opens a feed valve located on a water line to a deaerator tank to add makeup water to compensate for the condensate lost.

A(n) _____ are needed so the heater can be taken out of service without a shutdown.

A control element, or feedwater regulator, is located at the _____

A feedwater regulator is equipped with a ____ valve to ensure that the water and steam lines are free of sludge and sediment

In a low-pressure gas system, there is a safety switch between the manual reset valve and zero gas governor called a _____

In a high-pressure gas system, a low-gas-pressure switch with a ____ causes the combustion controller to secure the safety shutoff valves if the gas pressure is too low.

No. 2 fuel oil generally _____

_____ isolate a tank when it is not in use.

A ____ is used to clean the fuel before it goes to the burner

Natural draft is produced without a _____

In a natural draft system, the amount of draft can be increased by _____

Forced draft systems produce a pressure in a furnace that is ____ atmospheric pressure

_____ draft is draft produced by pulling air through the boiler furnace with a fan

From the stack of a combination draft system, the gases of combustion discharge into the _____

A _____ can be used to convert the movement of the internal parts of a pressure gauge into an electrical or digital signal that can be sent to a control system.

A(n) _____ is the method a controller uses to manipulate the measured value into something that can be used to make changes to the process to keep it at the desired operating conditions.

The ____ are the final elements that control the flow of gas and air to a burner.

List all the steps in the feedwater system:

List all the steps in a steam system: