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
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Power Engineering Chapter 88
- A lockout switch will energize after __ to __ seconds.
- If the damper motor does not operate 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?
- If shutdown occurs during firing 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?
- If no ignition occurs when starting a boiler which one would NOT be the possible cause?
- If a blower does not start which one would NOT be the possible cause?
- On a boiler with high-low fire control, if the damper positioning switch is in the wrong position
- The second from last step in an automatic boiler programmed shutdown sequence is
- The operating pressure control will control the
- The function of a programming control is
- Automatic boiler programming controls
- When an automatic unattended boiler starts up, the program timer will first:
- The timer of a programmed combustion control consists of a motor and a:
- If a shutdown occurs during normal firing of a boiler and the steam pressure is below the normal cutout value, the problem could be:
- On a gas fired automatic boiler a normal programmed start-up takes approximately:
- If during the pilot trial for ignition period, the pilot does not ignite, a lockout will occur
- After extinguishing the main flame, the next step in a programmed burner shutdown is
- An interrupted pilot of an automatic boiler:
- During a programmed start-up if an igniter spark is visible but no flame appears the operator should suspect:
- Boiler furnaces are purged:
- If the pilot flame is adequate but the main burner fails to ignite, the programmer must:
- The manual fuel shut-off valves of an automatic oil-fired boiler must be opened
- The programmer will go through a post purge: