Question 1
A process plant needs 250-psig steam and rapid response to large load swings. Which boiler construction is the best technical fit?
Show answer & explanation
Correct answer: B - A water-tube package boiler with low water inventory
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These 10 free CHI-SE questions are organized by exam domain, so you can see how each part of the City of Chicago Stationary Engineer License Written Exam blueprint is tested. Reveal the answer and explanation under each question.
A process plant needs 250-psig steam and rapid response to large load swings. Which boiler construction is the best technical fit?
Correct answer: B - A water-tube package boiler with low water inventory
A steam boiler's safety valve is set at 125 psig. The pressure-gauge rule requires a full-scale range of at least 1.5 times the safety-valve setting. Available gauges are 150, 180, 200, and 300 psig. What is the smallest acceptable range?
Correct answer: A - 200 psig
A boiler develops a surging water level and wet steam. Boiler-water conductivity is above the plant limit, dissolved oxygen is within target, and no hardness breakthrough is detected. Which corrective approach most directly addresses the indicated cause?
Correct answer: B - Reduce load and use approved surface blowdown to lower dissolved solids
On a No. 6 oil-fired boiler, oil-heater outlet temperature falls below its prescribed range. Soon afterward, stack O2 falls from 4.5% to 1.2%, CO rises sharply, and black smoke appears. Which explanation best accounts for the combined findings?
Correct answer: B - Cold, viscous oil is atomizing poorly and producing a fuel-rich flame
During firing, the gauge glass suddenly shows no water. The try cocks and remote level transmitter also fail to establish a reliable level. What should the stationary engineer do first?
Correct answer: C - Shut off heat input; do not add water
Steam demand rises abruptly, drum pressure falls, and the indicated water level climbs even though feedwater flow has not increased. Which response best reflects the likely transient?
Correct answer: D - Recognize swell and base feed response on steam and feed flows
During normal firing, the flame signal is lost. A trend log shows the fuel and ignition circuits remained energized for 5.7 seconds after loss of flame. How should this test result be classified?
Correct answer: C - Unacceptable; de-energization must occur within 4 seconds
After cleaning a nonmagnetic stainless-steel pressure component, visual inspection suggests a fine crack open to the surface. Which nondestructive examination method is best suited to confirm that indication?
Correct answer: A - Liquid penetrant testing
A centrifugal feed pump must deliver 400 gpm against 115 ft of total head. The liquid has specific gravity 1.00 and pump efficiency is 72%. Ignoring service factor and other design margins, which listed driver rating is the smallest that is not below the calculated pump brake horsepower?
Correct answer: D - 20 hp
A gas alarm occurs near an LPG-fired boiler. A ceiling-mounted detector reads normal, but a calibrated detector in a floor trench shows a hazardous concentration. Which property best explains the pattern?
Correct answer: B - Propane is heavier than air and can collect in low spaces
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