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NYC Stationary Engineer (H+H) exam
Questions and Correct Answers with
EXPLANATIONS LATEST THIS YEAR
Summarized Exam Coverage
The NYC Stationary Engineer (H+H) exam tests: operation, maintenance, and repair of high-pressure
boilers, steam systems, pumps, heat exchangers, generators, chillers, and HVAC equipment; NYC DOB
High-Pressure Boiler Operating Engineer license requirements; FDNY refrigeration (Q-01/Q-99) and fire
safety codes; safety devices (safety valves, low water cutoffs, gauges); inspect low-pressure boilers per
DOB unified inspection; reading meters/gauges and logging data; taking responsible charge of a watch
and directing personnel; and emergency response for plant equipment failures in a 24/7 healthcare
facility .
1. You are the stationary engineer on watch at NYC H+H. The high-pressure boiler safety valve pops at
150 psig and closes at 135 psig. What is the blowdown percentage?
A) 15%
B) 10%
C) 5%
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D) 2%
Answer: B
*Blowdown is the difference between popping and reseating pressure divided by set pressure; (150-
135)/150 = 10%, the minimum required for a spring loaded safety valve .*
2. What is the minimum blowdown percentage for a spring loaded safety valve per NYC code?
A) 2%
B) 5%
C) 10%
D) 15%
Answer: C
NYC code requires a minimum blowdown of 10% for spring loaded safety valves to ensure proper
reseating and prevent simmering .
3. How is the main steam pressure gauge tested for accuracy?
A) With a deadweight tester
B) With an inspector's gauge
C) By comparing to another gauge
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D) By closing the siphon valve
Answer: B
An inspector's gauge, which is calibrated and traceable, is used to verify the accuracy of the main steam
pressure gauge .
4. When will anchorage or guides for high-pressure piping be inspected?
A) Monthly
B) Quarterly
C) Annually
D) Every 5 years
Answer: C
Anchorage and guides for high-pressure piping systems must be inspected annually to ensure proper
alignment and movement .
5. How many brass washout plugs does a miniature boiler have?
A) 1 plug, ½ inch
B) 2 plugs, ¾ inch
C) 3 plugs, 1 inch
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D) 4 plugs, 1½ inch
Answer: C
A miniature boiler is required to have 3 brass washout plugs, each 1 inch in size, for cleaning the
waterside .
6. How often should high-pressure piping expansion joints be inspected?
A) Daily
B) Weekly
C) Monthly
D) Annually
Answer: B
Expansion joints on high-pressure piping require weekly inspection to detect leaks, misalignment, or
fatigue .
7. How long must a hydronic system be pressure tested?
A) 30 minutes at 50 psig
B) 1 hour at 80 psig
C) 2 hours at no less than 100 psig
NYC Stationary Engineer (H+H) exam
Questions and Correct Answers with
EXPLANATIONS LATEST THIS YEAR
Summarized Exam Coverage
The NYC Stationary Engineer (H+H) exam tests: operation, maintenance, and repair of high-pressure
boilers, steam systems, pumps, heat exchangers, generators, chillers, and HVAC equipment; NYC DOB
High-Pressure Boiler Operating Engineer license requirements; FDNY refrigeration (Q-01/Q-99) and fire
safety codes; safety devices (safety valves, low water cutoffs, gauges); inspect low-pressure boilers per
DOB unified inspection; reading meters/gauges and logging data; taking responsible charge of a watch
and directing personnel; and emergency response for plant equipment failures in a 24/7 healthcare
facility .
1. You are the stationary engineer on watch at NYC H+H. The high-pressure boiler safety valve pops at
150 psig and closes at 135 psig. What is the blowdown percentage?
A) 15%
B) 10%
C) 5%
, Page 2 of 124
D) 2%
Answer: B
*Blowdown is the difference between popping and reseating pressure divided by set pressure; (150-
135)/150 = 10%, the minimum required for a spring loaded safety valve .*
2. What is the minimum blowdown percentage for a spring loaded safety valve per NYC code?
A) 2%
B) 5%
C) 10%
D) 15%
Answer: C
NYC code requires a minimum blowdown of 10% for spring loaded safety valves to ensure proper
reseating and prevent simmering .
3. How is the main steam pressure gauge tested for accuracy?
A) With a deadweight tester
B) With an inspector's gauge
C) By comparing to another gauge
, Page 3 of 124
D) By closing the siphon valve
Answer: B
An inspector's gauge, which is calibrated and traceable, is used to verify the accuracy of the main steam
pressure gauge .
4. When will anchorage or guides for high-pressure piping be inspected?
A) Monthly
B) Quarterly
C) Annually
D) Every 5 years
Answer: C
Anchorage and guides for high-pressure piping systems must be inspected annually to ensure proper
alignment and movement .
5. How many brass washout plugs does a miniature boiler have?
A) 1 plug, ½ inch
B) 2 plugs, ¾ inch
C) 3 plugs, 1 inch
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D) 4 plugs, 1½ inch
Answer: C
A miniature boiler is required to have 3 brass washout plugs, each 1 inch in size, for cleaning the
waterside .
6. How often should high-pressure piping expansion joints be inspected?
A) Daily
B) Weekly
C) Monthly
D) Annually
Answer: B
Expansion joints on high-pressure piping require weekly inspection to detect leaks, misalignment, or
fatigue .
7. How long must a hydronic system be pressure tested?
A) 30 minutes at 50 psig
B) 1 hour at 80 psig
C) 2 hours at no less than 100 psig
