A lockout switch will energize after __ to __ seconds.

A lockout switch will energize after __ to __ seconds.

a. 5 to 10
b. 15 to 30
c. 10 to 15
d. 20 to 40
e. 15 to 25






Answer: B

On-off controls are common on?

On-off controls are common on?

a. firetube boilers
b. watertube boilers
c. small package boilers
d. large package boilers
e. all of the above

Answer: C

If the damper motor does not operate on a boiler which one would NOT be the possible cause?

If the damper motor does not operate on a boiler which one would NOT be the possible cause?

a. Damper positioning switch in wrong position.
b. Linkage loose or jammed.
c. The lock-out switch has tripped.
d. Motor does not drive to "open" or "close" during prepurge or close on burner shutdown.
e. Motor does not operate on demand.

Answer: C

If the burner stays on low fire on a boiler which one would NOT be the possible cause?

If the burner stays on low fire on a boiler which one would NOT be the possible cause?

a. Boiler pressure above high-low fire control setting.
b. Damper positioning switch in wrong
c. Inoperative damper motor.
d. Flame detector weak or defective.
e. Defective high-low fire or modulating control.





Answer: D

If shutdown occurs during firing a boiler which one would NOT be the possible cause?

If shutdown occurs during firing a boiler which one would NOT be the possible cause?

a. Loss or stoppage of fuel
b. Defective fuel valve, loose electrical connections
c. Flame detector weak or defective
d. Lens dirty or sight tube obstructed
e. Boiler pressure above high-low fire control setting.






Answer: E

If pilot or low-fire flame occurs in a boiler which one would NOT be the possible cause?

If pilot or low-fire flame occurs in a boiler which one would NOT be the possible cause?

a. Low fire switch open.
b. Insufficient pilot or low fire flame.
c. Supply to main nozzles restricted or cut off.
d. Inoperative programmer.




Answer: A

If no ignition occurs when starting a boiler which one would NOT be the possible cause?

If no ignition occurs when starting a boiler which one would NOT be the possible cause?

a. Lack of spark.
b. Insufficient pilot or low fire flame.
c. Spark but no flame.
d. Low fire switch open.
e. Timer switch in test position and timer stopped in prepurge.





Answer: B

If a blower does not start which one would NOT be the possible cause?

If a blower does not start which one would NOT be the possible cause?

a. Main disconnect switch open.
b. Blown fuses, tripped overloads, loose electrical connections.
c. Damper positioning switch in wrong
d. Combustion control safety lock-out switch tripped.
e. Limit control circuit not completed.





Answer: C

On a boiler with high-low fire control, if the damper positioning switch is in the wrong position

On a boiler with high-low fire control, if the damper positioning switch is in the wrong position

a) the damper motor may not operate
b) a pre-purge will not occur
c) a high fire main flame ignition could occur
d) nothing will happen when the manual start switch is closed
e) the pre-purge period will last indefinitely unless the problem is corrected





Answer: A

The second from last step in an automatic boiler programmed shutdown sequence is

The second from last step in an automatic boiler programmed shutdown sequence is

a) timer shutdown
b) main flame trial
c) post purge
d) operating control switch contacts closing
e) flame failure switch contacts opening





Answer: C

The operating pressure control will control the

The operating pressure control will control the

a) steam pressure in the boiler
b) gas pressure to the burner
c) water pressure to the boiler
d) boiler furnace pressure
e) steam pressure in the steam header






Answer: A

The function of a programming control is

The function of a programming control is

a) to supervise feedwater supply to the boiler
b) to regulate the fuel supply to the burner
c) to regulate combustion controls during start-up
d) control the boiler blowdown rate
e) to regulate fuel, air, and water supply to the boiler





Answer: C

Automatic boiler programming controls

Automatic boiler programming controls

a) must incorporate a modulating control system
b) do not require interlocking devices
c) require an ON-OFF or two-position control switch
d) cannot make use of high-low fire control
e) are not interconnected with the water level control system

Answer: C

When an automatic unattended boiler starts up, the program timer will first:

When an automatic unattended boiler starts up, the program timer will first:

a. Energize the ignition transformer and pilot gas solenoid valve
b. Start the post purge period
c. Start the forced draft fan
d. Energize the main gas valve
e. Energize the main feed water valve





Answer: C

The timer of a programmed combustion control consists of a motor and a:

The timer of a programmed combustion control consists of a motor and a:

a. Bellows
b. A nozzle and vane assembly
c. Number of cams and switches
d. Transmitter
e. Drive shaft






Answer: C

If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be:

If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be:

a. An interlock, such as the combustion air proving switch, has failed
b. Main flame trial failure
c. Pilot flame trial failure
d. Igniter transformer failure
e. High steam pressure limit switch tripped

Answer: A

On a gas fired automatic boiler a normal programmed start-up takes approximately:

On a gas fired automatic boiler a normal programmed start-up takes approximately:

a. 105 seconds
b. 55 seconds
c. 27 - 40 seconds
d. 120 seconds
e. 70 seconds





Answer: A

If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur

If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur

a. If the trial for ignition period has lasted approximately 15 to 30 seconds
b. Immediately
c. Within 4 or 5 seconds
d. After the flame relay de-energizes
e. After the main burner flame ignites






Answer: A

After extinguishing the main flame, the next step in a programmed burner shutdown is

After extinguishing the main flame, the next step in a programmed burner shutdown is

a. The timer motor stops
b. The main flame trial ends
c. A post-purge begins.
d. Operation control switch contacts close
e. Flame failure switch contacts open







Answer: C

An interrupted pilot of an automatic boiler:

An interrupted pilot of an automatic boiler:

a. Burns continuously, like that in a home furnace
b. Ignites before the main burner ignites, and is extinguished when the main burner is extinguished
c. Is one that has been extinguished by an inadequate flame signal
d. Ignites, is proven stable and extinguishes after the main flame is established
e. Must be manually ignited





Answer: D