DC Third Class Stationary Boilers (323) Exam | 100 Q&A | Detailed Explanations
Subject/Course: Boiler Operation, Maintenance, Safety, Controls, ASME Codes, DC
Regulations
Tags: DC Stationary Boiler License, Third Class Boiler Operator, ASME Code, Boiler
Safety, Controls, Water Treatment, Maintenance
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EXAM QUESTIONS
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1. According to DC regulations, what is the minimum boiler operator license
required for boilers over 3,000,000 BTU?
A. First Class
B. Second Class
C. Third Class
D. Fourth Class
Answer: C
Explanation: DC requires Third Class or higher license for boilers over 3,000,000
BTU input.
2. What is the maximum allowable working pressure (MAWP) based on according
to ASME Code?
, A. Design pressure
B. Operating pressure
C. Relief valve setting
D. Test pressure
Answer: A
Explanation: MAWP is based on design pressure established during boiler
construction per ASME.
3. According to ASME Code, how often must safety valves be tested?
A. Daily
B. Weekly
C. Monthly
D. Annually
Answer: C
Explanation: ASME requires safety valves to be tested monthly under operating
conditions.
4. What is the primary purpose of a low-water cutoff?
A. Prevent overheating
B. Control water level
C. Both A and B
D. Neither A nor B
, Answer: A
Explanation: Low-water cutoff prevents boiler operation when water level is
dangerously low.
5. According to DC regulations, what is the minimum blowdown valve size?
A. 3/4 inch
B. 1 inch
C. 1-1/4 inch
D. 1-1/2 inch
Answer: B
Explanation: Minimum 1-inch blowdown valve required for proper sediment
removal.
6. What is the recommended pH range for boiler water?
A. 7.0-8.0
B. 8.5-9.5
C. 10.0-11.0
D. 11.5-12.5
Answer: C
Explanation: Boiler water should be maintained at pH 10.0-11.0 for corrosion
control.
7. According to ASME, what is the minimum safety valve capacity?
, A. Equal to boiler capacity
B. 125% of maximum evaporation
C. 150% of maximum evaporation
D. 200% of maximum evaporation
Answer: B
Explanation: Safety valves must have minimum capacity of 125% of maximum
evaporation.
8. What is the purpose of a feedwater regulator?
A. Maintain water level
B. Control feedwater temperature
C. Both A and B
D. Neither A nor B
Answer: A
Explanation: Feedwater regulators maintain proper water level in boiler.
9. According to DC regulations, what records must be maintained?
A. Operating log
B. Maintenance records
C. Both A and B
D. Neither A nor B
Answer: C
Subject/Course: Boiler Operation, Maintenance, Safety, Controls, ASME Codes, DC
Regulations
Tags: DC Stationary Boiler License, Third Class Boiler Operator, ASME Code, Boiler
Safety, Controls, Water Treatment, Maintenance
===================================================================
=================
EXAM QUESTIONS
===================================================================
=================
1. According to DC regulations, what is the minimum boiler operator license
required for boilers over 3,000,000 BTU?
A. First Class
B. Second Class
C. Third Class
D. Fourth Class
Answer: C
Explanation: DC requires Third Class or higher license for boilers over 3,000,000
BTU input.
2. What is the maximum allowable working pressure (MAWP) based on according
to ASME Code?
, A. Design pressure
B. Operating pressure
C. Relief valve setting
D. Test pressure
Answer: A
Explanation: MAWP is based on design pressure established during boiler
construction per ASME.
3. According to ASME Code, how often must safety valves be tested?
A. Daily
B. Weekly
C. Monthly
D. Annually
Answer: C
Explanation: ASME requires safety valves to be tested monthly under operating
conditions.
4. What is the primary purpose of a low-water cutoff?
A. Prevent overheating
B. Control water level
C. Both A and B
D. Neither A nor B
, Answer: A
Explanation: Low-water cutoff prevents boiler operation when water level is
dangerously low.
5. According to DC regulations, what is the minimum blowdown valve size?
A. 3/4 inch
B. 1 inch
C. 1-1/4 inch
D. 1-1/2 inch
Answer: B
Explanation: Minimum 1-inch blowdown valve required for proper sediment
removal.
6. What is the recommended pH range for boiler water?
A. 7.0-8.0
B. 8.5-9.5
C. 10.0-11.0
D. 11.5-12.5
Answer: C
Explanation: Boiler water should be maintained at pH 10.0-11.0 for corrosion
control.
7. According to ASME, what is the minimum safety valve capacity?
, A. Equal to boiler capacity
B. 125% of maximum evaporation
C. 150% of maximum evaporation
D. 200% of maximum evaporation
Answer: B
Explanation: Safety valves must have minimum capacity of 125% of maximum
evaporation.
8. What is the purpose of a feedwater regulator?
A. Maintain water level
B. Control feedwater temperature
C. Both A and B
D. Neither A nor B
Answer: A
Explanation: Feedwater regulators maintain proper water level in boiler.
9. According to DC regulations, what records must be maintained?
A. Operating log
B. Maintenance records
C. Both A and B
D. Neither A nor B
Answer: C
