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Iowa Steam Plant Operator EXAM QUESTIONS AND CORRECT
VERIFIED SOLUTIONS LATEST UPDATE THIS YEAR – JUST
RELEASED
Iowa Steam Plant Operator Exam
10-Line Exam Coverage in Points Form
1. Licensing Authority & Exam Logistics – Iowa Boiler and Pressure Vessel Board under
Iowa Division of Labor Services; 100 scored questions; 2-hour time limit; 70% passing
score; 4 license grades (1st through 4th Class)
2. License Classifications & Scope – 1st Class (highest, unlimited any size boiler); 2nd Class
(moderate restrictions); 3rd Class (more restrictions); 4th Class (entry-level, limited to
low-pressure boilers); experience requirements vary by grade
3. Boiler Operations & Combustion (25%) – Startup/shutdown procedures, combustion
efficiency, air-to-fuel ratio, draft systems, operating controls, gas-line pressure testing
(1.25 × design pressure held 30+ min)
4. Safety Devices & Emergency Procedures (25%) – Safety valves (ASME requirements),
low-water cutoff (LWCO) testing, flame safeguards, high-limit controls, emergency
procedures, pressure relief valve sizing
5. Water Treatment & Chemistry (20%) – Feedwater treatment, pH control, TDS
management, oxygen scavenging, scale prevention, blowdown procedures, chemical
feed systems
6. Maintenance & Inspections (15%) – Annual high-pressure boiler certificate renewal,
boiler maintenance, refractory repair, tube inspections, hydrostatic testing, lay-up
procedures, proper clearance in front of boiler for service access
7. Iowa Regulations & Licensing (15%) – Iowa license grades and limitations, experience
requirements, Boiler and Pressure Vessel Board rules, installation notice filing before
new boiler installation (prior to installation), contractor insurance requirements (liability
and workers’ compensation)
8. Piping & Fuel Gas Systems – Gas-line pressure testing sequence (pressurize to 1.25×
design pressure, hold 30+ min, then depressurize); sediment trap location (within 10 ft
of appliance); approved hydronic piping material (copper); prohibited gas piping joints
(soldered)
9. Electrical & Controls – Motor overcurrent protection sizing (NEC 430.52, 125% multiplier
for motor protection); Code-compliant air removal (automatic air separator); NFPA 85
pre-purge requirements for gas-fired boiler startup
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10. Documentation & Inspections – ASME-stamped pressure vessel and operating
certificate required; annual operating certificate renewal for high-pressure boilers; ASME
code compliance; proper boiler room access and fire-rated self-closing doors required
Sample MCQ Questions with Rationales
1. How many license grades for boiler operators are issued in Iowa?
A) Two (Low Pressure and High Pressure)
B) Three
C) Four
D) Five
Correct Answer: C
Rationale: Iowa issues four classes of boiler operator licenses: 1st Class, 2nd Class, 3rd Class,
and 4th Class. The 1st Class license is the highest grade, allowing the operator to operate any
size boiler. Each lower grade has increasing restrictions on the size and type of boiler that may
be operated .
2. What is the passing score for the Iowa boiler operator exam?
A) 60%
B) 70%
C) 75%
D) 80%
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Correct Answer: B
Rationale: A score of 70% is required to pass the Iowa boiler operator exam. The exam is
administered by the Iowa Boiler and Pressure Vessel Board under the Iowa Division of Labor
Services .
3. What is the time limit for completing the Iowa boiler operator exam?
A) 1 hour
B) 1.5 hours
C) 2 hours
D) 3 hours
Correct Answer: C
Rationale: The exam has a 2-hour time limit .
4. How many scored questions are on the Iowa boiler operator exam?
A) 50
B) 75
C) 100
D) 150
Correct Answer: C
Rationale: The exam consists of 100 scored questions covering boiler operations, safety devices,
water treatment, maintenance, and Iowa-specific regulations .
5. How often must power boilers be inspected in Iowa?
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A) Every 6 months
B) Annually
C) Every 2 years
D) Every 3 years
Correct Answer: B
Rationale: Power boilers in Iowa must receive a certificate inspection at least annually.
Inspections are performed by state-commissioned inspectors or authorized insurance company
inspectors holding National Board commissions. Operating with an expired certificate is a
violation of Iowa law .
6. Which license class is the highest and allows operation of any size boiler in Iowa?
A) 4th Class
B) 3rd Class
C) 2nd Class
D) 1st Class
Correct Answer: D
Rationale: The 1st Class license is the highest grade, authorizing operation of boilers of
unlimited size. Each lower grade has increasing restrictions on the size and type of boiler that
may be operated .
7. What agency oversees boiler safety and licensing in Iowa?
Iowa Steam Plant Operator EXAM QUESTIONS AND CORRECT
VERIFIED SOLUTIONS LATEST UPDATE THIS YEAR – JUST
RELEASED
Iowa Steam Plant Operator Exam
10-Line Exam Coverage in Points Form
1. Licensing Authority & Exam Logistics – Iowa Boiler and Pressure Vessel Board under
Iowa Division of Labor Services; 100 scored questions; 2-hour time limit; 70% passing
score; 4 license grades (1st through 4th Class)
2. License Classifications & Scope – 1st Class (highest, unlimited any size boiler); 2nd Class
(moderate restrictions); 3rd Class (more restrictions); 4th Class (entry-level, limited to
low-pressure boilers); experience requirements vary by grade
3. Boiler Operations & Combustion (25%) – Startup/shutdown procedures, combustion
efficiency, air-to-fuel ratio, draft systems, operating controls, gas-line pressure testing
(1.25 × design pressure held 30+ min)
4. Safety Devices & Emergency Procedures (25%) – Safety valves (ASME requirements),
low-water cutoff (LWCO) testing, flame safeguards, high-limit controls, emergency
procedures, pressure relief valve sizing
5. Water Treatment & Chemistry (20%) – Feedwater treatment, pH control, TDS
management, oxygen scavenging, scale prevention, blowdown procedures, chemical
feed systems
6. Maintenance & Inspections (15%) – Annual high-pressure boiler certificate renewal,
boiler maintenance, refractory repair, tube inspections, hydrostatic testing, lay-up
procedures, proper clearance in front of boiler for service access
7. Iowa Regulations & Licensing (15%) – Iowa license grades and limitations, experience
requirements, Boiler and Pressure Vessel Board rules, installation notice filing before
new boiler installation (prior to installation), contractor insurance requirements (liability
and workers’ compensation)
8. Piping & Fuel Gas Systems – Gas-line pressure testing sequence (pressurize to 1.25×
design pressure, hold 30+ min, then depressurize); sediment trap location (within 10 ft
of appliance); approved hydronic piping material (copper); prohibited gas piping joints
(soldered)
9. Electrical & Controls – Motor overcurrent protection sizing (NEC 430.52, 125% multiplier
for motor protection); Code-compliant air removal (automatic air separator); NFPA 85
pre-purge requirements for gas-fired boiler startup
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10. Documentation & Inspections – ASME-stamped pressure vessel and operating
certificate required; annual operating certificate renewal for high-pressure boilers; ASME
code compliance; proper boiler room access and fire-rated self-closing doors required
Sample MCQ Questions with Rationales
1. How many license grades for boiler operators are issued in Iowa?
A) Two (Low Pressure and High Pressure)
B) Three
C) Four
D) Five
Correct Answer: C
Rationale: Iowa issues four classes of boiler operator licenses: 1st Class, 2nd Class, 3rd Class,
and 4th Class. The 1st Class license is the highest grade, allowing the operator to operate any
size boiler. Each lower grade has increasing restrictions on the size and type of boiler that may
be operated .
2. What is the passing score for the Iowa boiler operator exam?
A) 60%
B) 70%
C) 75%
D) 80%
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Correct Answer: B
Rationale: A score of 70% is required to pass the Iowa boiler operator exam. The exam is
administered by the Iowa Boiler and Pressure Vessel Board under the Iowa Division of Labor
Services .
3. What is the time limit for completing the Iowa boiler operator exam?
A) 1 hour
B) 1.5 hours
C) 2 hours
D) 3 hours
Correct Answer: C
Rationale: The exam has a 2-hour time limit .
4. How many scored questions are on the Iowa boiler operator exam?
A) 50
B) 75
C) 100
D) 150
Correct Answer: C
Rationale: The exam consists of 100 scored questions covering boiler operations, safety devices,
water treatment, maintenance, and Iowa-specific regulations .
5. How often must power boilers be inspected in Iowa?
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A) Every 6 months
B) Annually
C) Every 2 years
D) Every 3 years
Correct Answer: B
Rationale: Power boilers in Iowa must receive a certificate inspection at least annually.
Inspections are performed by state-commissioned inspectors or authorized insurance company
inspectors holding National Board commissions. Operating with an expired certificate is a
violation of Iowa law .
6. Which license class is the highest and allows operation of any size boiler in Iowa?
A) 4th Class
B) 3rd Class
C) 2nd Class
D) 1st Class
Correct Answer: D
Rationale: The 1st Class license is the highest grade, authorizing operation of boilers of
unlimited size. Each lower grade has increasing restrictions on the size and type of boiler that
may be operated .
7. What agency oversees boiler safety and licensing in Iowa?
