R4B04-02-05-01 On a boiler fuel system that has a double block and bleed arrangement:
Select one:
a. The main SSOVs and the vent valves open at the same
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b. The main SSOVs open before the pre-purge occurs
c. The main SSOVs energize when the bleed valve de-energizes.
d. The bleed valve is a normally open solenoid valve. - ✔✔ D
R4B04-03-03-07 Failure to _____ the furnace thoroughly before light-up can cause a furnace explosion.
Select one:
a. purge
b. soot-blow
c. cool
d. preheat - ✔✔ A
A power boiler in steam service has a safety valve set to 2000 kPa. What should the maximum operating pressure be for this boiler?
Select one:
a. 1990kPa.
b. 1950kPa.
c. 2000kPa.
d. 1800kPa. - ✔✔ D
Cutting steam boilers into a pressurized system is different for heating boilers and power boilers, because
Select one:
a. generally speaking, steam heating systems do not use condensate return systems.
b. power boilers do not generally have non-return valves.
c. steam heating systems are more complex than power boiler systems.
d. steam heating systems may not have all the valves and drains that power boiler systems have. - ✔✔ D
R4B04-02-01-02 When warming up a boiler, it should be:
Select one:
a. warmed up at 55 degrees Celsius per hour, to prevent thermal shock
b. warmed up at a rate of one degree every five minutes, to protect the refractory
c. warmed up quickly to prevent flue gas condensation
d. warmed up quickly so there is not enough time for differential thermal expansion to occur - ✔✔ A
Who can remove the supervisory lock from the lock box?
Select one:
a. The plant Workplace Safety and Health committee member.
b. The last contractor working on the boiler.
c. The chief engineer, shift engineer, or qualified person delegated by the chief engineer.
d. Only the qualified operator who initially performed the lockout. - ✔✔ C
Because natural gas is colourless and odourless, ___________ is added to the gas so that it is easier to detect a leak.
Select one:
a. mercaptan
b. an irritant
c. propane
d. fluorescent dye - ✔✔ A
For a wet layup, what is the recommended boiler water sodium sulfite residual?
Select one:
a. 200 ppm
b. 40 ppm
c. 50 to 80 ppm
d. 10 ppm - ✔✔ A
R4B04-02-01-01 Boilers should be warmed up
Select one:
a. using only the pilot burner.
b. slowly, to minimize differential expansion and thermal shock
c. rapidly, so the metal heats up faster
d. with maximum combustion air, to prevent smoking - ✔✔ B
Which of the following may cause water hammer in steam lines?
Select one:
a. having too many condensate drains open.
b. opening the steam trap bypass valves.
c. missing or damaged pipe insulation.
d. opening steam valves slowly. - ✔✔ C
Deaerators often have low-level alarms and low-low level trips
Select one:
a. in case the condensate transfer pumps trip.
b. in case the boiler feedwater pumps trip.
c. in case the boiler feedwater valve fails open.
d. in case the boiler trips. - ✔✔ A
R4B04-03-03-01 If a boiler sustains a low water condition
Select one:
a. open the safety valve or drum vent valve to release pressure.
b. use cool feedwater to quench any overheated heating surface.
c. shut down the burner, let the boiler cool slowly, then drain and inspect it for damage due to overheating.
d. immediately feed water into the boiler to raise the level. - ✔✔ C
Who should verify a steam boiler lockout?
Select one:
a. Each and every contractor or employee working on the boiler.
b. A representative of the plant Workplace Safety and Health committee.
c. A second qualified operator.
d. Nobody. - ✔✔ C
What is usually considered the first task when coming onto a shift:
Select one:
a. read the log book
b. perform a complete set of operator rounds
c. complete the water tests
d. Check water levels - ✔✔ A
R4B04-02-01-04 Slight smoking when first starting a cold oil-fired boiler
Select one:
a. occurs because the furnace is cold.
b. is abnormal, and requires immediate attention.
c. is caused by too little fuel pressure.
d. is caused by too much excess air. - ✔✔ A
Mechanical chart recorders
Select one:
a. are used so regular readings do not need to be taken.
b. require constant winding of their clock mechanisms.
c. need their charts replaced each month.
d. require regular replacement of paper and ink. - ✔✔ D
When closing up a boiler,
Select one:
a. handhole and manhole yokes must be torqued until the gaskets are compressed to less than 1 mm thick.
b. new handhole and manhole gaskets must be used, to prevent dangerous blowouts and costly unplanned boiler outages.
c. handhole and manhole gaskets should be reused, because they are expensive.
d. handhole and manhole gaskets must be coated with sealant, such as graphite paste or silicone. - ✔✔ B
In a multiple boiler high pressure steam plant, when starting an entire system from cold
Select one:
a. A small auxiliary heating boiler is used to warm the steam lines while the power boilers are warming.
b. The entire system warms and pressurizes as one boiler warms, except for the boilers being left off line.
c. Boilers remaining off-line must have their boiler and header stop valves open, and their non-return drain valves shut.
d. All the boilers are started and warmed at the same time. - ✔✔ B [Show Less]