Page 1 of 111
Louisiana (New Orleans) Second Class Stationary Boilers
661-LA 661 Exam ACTUAL EXAM COMPLETE QUESTIONS
AND CORRECT ANSWERS LATEST UPDATE THIS YEAR
SUMMARIZED EXAM COVERAGE
The Second Class Stationary Boiler exam focuses on safe operation and maintenance of boiler systems,
including combustion control, water level regulation, and safety device management. Candidates must
understand boiler construction, heat transfer principles, fuel systems, and operational procedures.
Strong emphasis is placed on safety systems such as low-water cutoffs, pressure relief valves, and
emergency shutdown procedures. The exam also evaluates knowledge of water treatment,
troubleshooting mechanical issues, steam distribution, and regulatory compliance to ensure safe
industrial boiler operation.
1.
A boiler operator notices fluctuating steam pressure during normal operation under constant load. What
is the most likely cause?
A. Stable fuel supply
B. Inconsistent burner combustion or control malfunction
, Page 2 of 111
C. Excess insulation
D. Oversized steam piping
Answer: B
Rationale: Combustion instability or control failure causes pressure fluctuations.
2.
A boiler water level suddenly drops below safe operating range. What is the immediate action?
A. Increase fuel supply
B. Shut down boiler and verify low-water cutoff operation
C. Open steam outlet valve
D. Ignore if pressure is stable
Answer: B
Rationale: Low water condition can cause catastrophic failure.
3.
During startup, the burner fails to ignite despite fuel flow being present. What is the most likely issue?
, Page 3 of 111
A. Excess steam pressure
B. Ignition system failure or flame safeguard lockout
C. High water level
D. Clean combustion chamber
Answer: B
Rationale: Ignition or safety interlock failure prevents firing.
4.
A boiler is producing excessive black smoke from the stack. What is the most likely cause?
A. Excess air supply
B. Incomplete combustion due to insufficient air
C. Clean fuel system
D. Low steam demand
Answer: B
Rationale: Black smoke indicates incomplete combustion.
5.
, Page 4 of 111
A safety valve on a boiler lifts frequently during operation. What does this indicate?
A. Proper operation
B. Excessive pressure buildup
C. Low fuel supply
D. Normal fluctuation
Answer: B
Rationale: Frequent lifting indicates overpressure conditions.
6.
A boiler operator observes scale buildup inside tubes. What is the primary cause?
A. Clean feedwater
B. Hard water with mineral deposits
C. Excess air supply
D. Low pressure operation
Answer: B
Rationale: Hard water causes scaling in boiler tubes.
Louisiana (New Orleans) Second Class Stationary Boilers
661-LA 661 Exam ACTUAL EXAM COMPLETE QUESTIONS
AND CORRECT ANSWERS LATEST UPDATE THIS YEAR
SUMMARIZED EXAM COVERAGE
The Second Class Stationary Boiler exam focuses on safe operation and maintenance of boiler systems,
including combustion control, water level regulation, and safety device management. Candidates must
understand boiler construction, heat transfer principles, fuel systems, and operational procedures.
Strong emphasis is placed on safety systems such as low-water cutoffs, pressure relief valves, and
emergency shutdown procedures. The exam also evaluates knowledge of water treatment,
troubleshooting mechanical issues, steam distribution, and regulatory compliance to ensure safe
industrial boiler operation.
1.
A boiler operator notices fluctuating steam pressure during normal operation under constant load. What
is the most likely cause?
A. Stable fuel supply
B. Inconsistent burner combustion or control malfunction
, Page 2 of 111
C. Excess insulation
D. Oversized steam piping
Answer: B
Rationale: Combustion instability or control failure causes pressure fluctuations.
2.
A boiler water level suddenly drops below safe operating range. What is the immediate action?
A. Increase fuel supply
B. Shut down boiler and verify low-water cutoff operation
C. Open steam outlet valve
D. Ignore if pressure is stable
Answer: B
Rationale: Low water condition can cause catastrophic failure.
3.
During startup, the burner fails to ignite despite fuel flow being present. What is the most likely issue?
, Page 3 of 111
A. Excess steam pressure
B. Ignition system failure or flame safeguard lockout
C. High water level
D. Clean combustion chamber
Answer: B
Rationale: Ignition or safety interlock failure prevents firing.
4.
A boiler is producing excessive black smoke from the stack. What is the most likely cause?
A. Excess air supply
B. Incomplete combustion due to insufficient air
C. Clean fuel system
D. Low steam demand
Answer: B
Rationale: Black smoke indicates incomplete combustion.
5.
, Page 4 of 111
A safety valve on a boiler lifts frequently during operation. What does this indicate?
A. Proper operation
B. Excessive pressure buildup
C. Low fuel supply
D. Normal fluctuation
Answer: B
Rationale: Frequent lifting indicates overpressure conditions.
6.
A boiler operator observes scale buildup inside tubes. What is the primary cause?
A. Clean feedwater
B. Hard water with mineral deposits
C. Excess air supply
D. Low pressure operation
Answer: B
Rationale: Hard water causes scaling in boiler tubes.
