A boiler with only an induced draft fan:

A boiler with only an induced draft fan:

a. Will have a negative furnace pressure
b. Is extremely inefficient
c. Needs a very tall stack
d. Will have a positive furnace pressure
e. Cannot maintain a stable fire



Answer: A

Boiler chimneys are commonly lined with:

Boiler chimneys are commonly lined with:

a. Concrete
b. Rubber
c. Fire brick
d. Mortar
e. Insulation




Answer: C

A characteristic of mechanical draft is that the draft:

A characteristic of mechanical draft is that the draft:

a. Varies with atmospheric pressure
b. Varies with chimney height
c. Varies with chimney temperature
d. Is properly regulated during all firing conditions
e. Varies with atmospheric temperature




Answer: D

Boiler combustion is regulated by:

Boiler combustion is regulated by:

a. Varying the speed of an ID fan
b. Controlling or regulating the fuel flow
c. Varying the speed of an FD fan
d. Controlling or regulating the air flow
e. Controlling the air and fuel flow




Answer: E

Natural draft is produced in a boiler furnace when:

Natural draft is produced in a boiler furnace when:

a. Hot flue gases contract so that each cubic meter has more mass
b. Gases in the stack have less mass than an equal column of outside air
c. Gases in the stack have more mass than an equal column of outside air
d. Hot flue gases condense
e. The dampers are fully closed


Answer: A

Induced draft may be accomplished by a:

Induced draft may be accomplished by a:

a. Steam jet
b. Barometric damper
c. Tall chimney
d. Wind box
e. Velocity stack


Answer: A

When an air heater is used in a boiler:

When an air heater is used in a boiler:

a. The forced draft fan supplies hot gases to the air heater
b. The induced draft fan supplies combustion air to the air heater
c. It increases the efficiency of the boiler
d. The boiler usually has only a forced draft fan
e. A balanced draft system cannot be used




Answer: C

The inclined tube manometer:

The inclined tube manometer:

a. Uses pressure to tilt a common "U" tube manometer, making it more accurate and easier to read
b. Can only measure positive pressure
c. Can only measure a vacuum
d. Operates on the same principle as the "U" tube manometer
e. Operates by displacing a compressed gas




Answer: D

In a forced draft system, the furnace pressure is:

In a forced draft system, the furnace pressure is:

a. Above atmospheric pressure
b. Below atmospheric pressure
c. At atmospheric pressure
d. Measured in psi
e. Not measurable




Answer: A

An induced draft fan:

An induced draft fan:

a. Is physically smaller than a forced draft fan
b. Has less expensive materials of construction than an FD fan
c. Operates at much higher temperatures than an FD fan
d. Discharges air to the wind box
e. Handles air only



Answer: C

A diaphragm type pressure gauge:

A diaphragm type pressure gauge:

a. Is used to measure high pressures
b. Operates on a mercury column
c. Cannot be used for pressures greater than atmospheric
d. Is only found on large steam generators
e. Is used to measure very small pressures



Answer: E

When draft is produced by natural means:

When draft is produced by natural means:

a. Hot air surrounding the boiler increases draft
b. Fans control the flue gas flow
c. A short stack is preferred over a tall one
d. The diameter of the stack will improve the draft
e. Cooler air surrounding the boiler increases draft

Answer: E

With an axial flow fan, the air flow:

With an axial flow fan, the air flow:

a. Is at right angles to the windbox
b. Is at right angles to the shaft
c. Does not come in contact with driving motor
d. Is the most efficient
e. Is parallel to the fan shaft




Answer: E

A more durable chimney for a power plant application is the _____ chimney.

A more durable chimney for a power plant application is the _____ chimney.

a. Brick
b. Reinforced concrete
c. Steel
d. Insulated
e. Guy wire supported



Answer: B

In a balanced draft system, the air heater is located:

In a balanced draft system, the air heater is located:

a. Between the economizer and the superheater
b. Between the forced draft fan and the superheater
c. Between ID fan and boiler
d. Between ID fan and stack
e. On inlet ducting to forced draft fan





Answer: C

Primary air:

Primary air:

a. Is supplied in the combustion zone
b. Is the same as excess air
c. Is supplied with all types of burners
d. Is premixed with fuel before being admitted to the furnace
e. Enters the furnace before the fuel




Answer: D

Inlet damper control on a fan:

Inlet damper control on a fan:

a. Requires more power to drive the fan when the vanes are closed.
b. Requires less power to drive the fan at reduced loads.
c. Is only used when the fan is driven by a steam turbine.
d. Is only used on forced draft fans.
e. Is far less complicated than outlet damper control.



Answer: B

The most efficient operation of a fan demands that:

The most efficient operation of a fan demands that:

a. The speed be only high enough to supply the required amount of air
b. Inlet damper controls are used
c. Outlet damper controls are used
d. Constant speed electric motors are used
e. Gaseous fuels are fired




Answer: A

With fan output damper control:

With fan output damper control:

a. The fan air pressure decreases with a decrease in air flow
b. The fan air pressure increases with a decrease in air flow
c. The damper is placed on the inlet side of the fan
d. Fan output is difficult to control
e. The furnace pressure remains constant



Answer: B

Which code specifies standards for the air openings required into a boiler room when the boiler is burning gas?

Which code specifies standards for the air openings required into a boiler room when the boiler is burning gas?

A. CSA B-52
B. ASME Section 1
C. CSA B-149.1
D. CSA B-139.1





Answer: C