Free Practice Questions for MD Boiler Operator

General Knowledge and Problem Solving

Boiler fundamentals, calculations and troubleshooting; 20 items on Grades 5 and 4, 10 on Grade 3, 5 on Grades 2 and 1 (PSI bulletin, updated 9/1/2024)

Basic Electricity

DC and AC circuit basics per the listed Lessons in Electric Circuits chapters; 5 items on every grade

Boiler Types and Equipment

Firetube, watertube and heating boiler construction and fittings; 5 items on Grades 5, 4, 2 and 1, 10 on Grade 3

Burners and Fuel Train

Burner types, fuel trains, combustion controls and flame safeguards; 5 items on Grades 5 and 4, 10 on Grades 3, 2 and 1

Pumps and Valves

Feedwater pumps, safety and stop valves, non-return valves; 5 items on Grades 5 and 4, 10 on Grades 3, 2 and 1

Sequential Operations

Start-up, cutting a boiler in on a live header, shutdown and lay-up sequences; 10 items on Grades 3, 2 and 1 (not tested on Grades 5 and 4)

Inspections and Maintenance

Internal and external inspections, testing of safety devices, maintenance routines; 5 items on Grades 5, 4 and 3, 10 on Grades 2 and 1

Central Station and Chillers

Surface condensers, vacuum, chillers and refrigeration in central plants; 5 items on Grades 3, 2 and 1 (not tested on Grades 5 and 4)

Water Treatment

Feedwater chemistry, scale, corrosion, blowdown and treatment programs; 5 items on Grades 5, 4 and 3, 10 on Grades 2 and 1

Emergency Operations

Low water, tube rupture, flame failure and other emergency responses; 5 items on every grade

Auxiliary Equipment

Deaerators, economizers, feedwater heaters, compressors and plant auxiliaries; 5 items on every grade