DC BOILER (FORMULAS AND CONSTANTUSED FOR
THE DC 3RD BOILR) QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
Q&A 2026 |INSTANT DOWNLOAD
1. What is the formula used to convert Fahrenheit to Celsius?
A. C = (F + 32) × 9/5
B. C = F × 5/9
C. C = (F − 32) × 5/9
D. C = (F + 32) × 5/9
Rationale:
Temperature conversion is common in boiler calculations when
comparing system measurements.
2. What is the boiling point of water at atmospheric pressure?
A. 100°F
B. 180°F
C. 200°F
D. 212°F
Rationale:
Water boils at 212°F at 14.7 psi atmospheric pressure, which is
a key constant in steam generation.
3. What is standard atmospheric pressure at sea level?
,A. 10.7 psi
B. 14.7 psi
C. 18 psi
D. 21 psi
Rationale:
Atmospheric pressure affects boiling points and pressure
calculations.
4. What is the formula for calculating heat transfer?
A. Q = m × Cp × ΔT
B. Q = m + Cp + T
C. Q = m / Cp
D. Q = Cp × T
Rationale:
Heat transfer equals mass × specific heat × temperature
change.
5. What is the specific heat of water?
A. 0.5 Btu/lb°F
B. 1 Btu/lb°F
C. 2 Btu/lb°F
D. 3 Btu/lb°F
Rationale:
Water requires 1 BTU to raise 1 lb by 1°F.
,6. How many BTUs are required to raise 1 pound of water
from 32°F to 212°F?
A. 100
B. 180
C. 212
D. 970
Rationale:
Temperature increase = 212 − 32 = 180°F, therefore 180 BTU
required.
7. What is the latent heat of vaporization of water at
atmospheric pressure?
A. 180 BTU/lb
B. 500 BTU/lb
C. 970 BTU/lb
D. 1200 BTU/lb
Rationale:
It takes 970 BTU to convert 1 lb of water at boiling point to
steam.
8. Total heat of steam at atmospheric pressure is
approximately:
, A. 970 BTU/lb
B. 1000 BTU/lb
C. 1150 BTU/lb
D. 1500 BTU/lb
Rationale:
Total heat = sensible heat + latent heat.
9. One horsepower equals how many BTUs per hour?
A. 25,000
B. 30,000
C. 33,475
D. 40,000
Rationale:
Used in calculating boiler horsepower capacity.
10. One boiler horsepower equals:
A. 30 lb steam/hr
B. 34.5 lb steam/hr
C. 40 lb steam/hr
D. 50 lb steam/hr
Rationale:
Boiler horsepower equals evaporating 34.5 lb of water/hr from
and at 212°F.
THE DC 3RD BOILR) QUESTIONS AND CORRECT
ANSWERS (VERIFIED ANSWERS) PLUS RATIONALES
Q&A 2026 |INSTANT DOWNLOAD
1. What is the formula used to convert Fahrenheit to Celsius?
A. C = (F + 32) × 9/5
B. C = F × 5/9
C. C = (F − 32) × 5/9
D. C = (F + 32) × 5/9
Rationale:
Temperature conversion is common in boiler calculations when
comparing system measurements.
2. What is the boiling point of water at atmospheric pressure?
A. 100°F
B. 180°F
C. 200°F
D. 212°F
Rationale:
Water boils at 212°F at 14.7 psi atmospheric pressure, which is
a key constant in steam generation.
3. What is standard atmospheric pressure at sea level?
,A. 10.7 psi
B. 14.7 psi
C. 18 psi
D. 21 psi
Rationale:
Atmospheric pressure affects boiling points and pressure
calculations.
4. What is the formula for calculating heat transfer?
A. Q = m × Cp × ΔT
B. Q = m + Cp + T
C. Q = m / Cp
D. Q = Cp × T
Rationale:
Heat transfer equals mass × specific heat × temperature
change.
5. What is the specific heat of water?
A. 0.5 Btu/lb°F
B. 1 Btu/lb°F
C. 2 Btu/lb°F
D. 3 Btu/lb°F
Rationale:
Water requires 1 BTU to raise 1 lb by 1°F.
,6. How many BTUs are required to raise 1 pound of water
from 32°F to 212°F?
A. 100
B. 180
C. 212
D. 970
Rationale:
Temperature increase = 212 − 32 = 180°F, therefore 180 BTU
required.
7. What is the latent heat of vaporization of water at
atmospheric pressure?
A. 180 BTU/lb
B. 500 BTU/lb
C. 970 BTU/lb
D. 1200 BTU/lb
Rationale:
It takes 970 BTU to convert 1 lb of water at boiling point to
steam.
8. Total heat of steam at atmospheric pressure is
approximately:
, A. 970 BTU/lb
B. 1000 BTU/lb
C. 1150 BTU/lb
D. 1500 BTU/lb
Rationale:
Total heat = sensible heat + latent heat.
9. One horsepower equals how many BTUs per hour?
A. 25,000
B. 30,000
C. 33,475
D. 40,000
Rationale:
Used in calculating boiler horsepower capacity.
10. One boiler horsepower equals:
A. 30 lb steam/hr
B. 34.5 lb steam/hr
C. 40 lb steam/hr
D. 50 lb steam/hr
Rationale:
Boiler horsepower equals evaporating 34.5 lb of water/hr from
and at 212°F.
