Free NYC-HPBOE Practice Questions

Question 1

A firing boiler shows no water in the gauge glass, and the pressure parts may already be overheated. The feed pump is available. Which response best limits the immediate hazard?

Accepted Answer

Trip the fuel, do not add water, and begin controlled isolation and cooling

Answer

Run the feed pump at maximum capacity until the normal level is restored

Answer

Lift the safety valve manually to reduce metal temperature more quickly

Answer

Bypass the low-water cutoff long enough to confirm whether its switch has failed

Question 2

A new 4-inch high-pressure steam branch has a design pressure of 125 psig. Unless the responsible engineer obtains the permitted written waiver, which fabrication and examination combination applies?

Accepted Answer

Butt-welded construction with 10% random radiography

Answer

Butt-welded construction with no routine weld radiography required at this pressure

Answer

Threaded construction with 10% random radiography

Answer

Socket-welded construction with 100% radiography

Question 3

Boiler 2 tripped on low water at 14:20, was repaired and function-tested, and returned to service at 16:05. The original entry, "LWCO reset; boiler normal," is rejected. Which replacement creates the most complete reconstructable record?

Accepted Answer

14:20 - Boiler 2 low-water trip; glass 3/8 inch above low point; fuel secured; S. Patel notified at 14:22; M. Chen repaired linkage; cutoff and fuel trip tested; restart authorized by S. Patel at 16:05 - J. Rivera

Answer

14:20 - Boiler 2 low-water trip; glass 3/8 inch above the low point; feed pump restored level; burner relit at 14:35; responsible engineer notified at 14:50; no defect found during the event - J. Rivera

Answer

14:20 - Boiler 2 low-water trip; responsible engineer notified; feed-control linkage repaired under work order FC-221; alarm and relay reset; restart authorized at 16:05 - J. Rivera

Answer

14:20 - Boiler 2 low-water trip; glass 3/8 inch above the low point; fuel secured; work order FC-221 opened; linkage repair completed; unit listed ready for the next shift - J. Rivera

Question 4

Two shell courses have TS = 55,000 psi, inside radius = 24 inches, and safety factor = 5. Course A has t = 0.50 inch and E = 0.90; Course B has t = 0.42 inch and E = 0.85. The operating certificate is limited to 160 psi. Using P = (TS × t × E) ÷ (R × FS), what is the maximum authorized operating pressure?

Accepted Answer

160 psi; the certificate is lower than Course B's approximately 164-psi result

Answer

206 psi, based on Course A

Answer

185 psi, based on the average of both courses

Answer

164 psi, because the weakest calculated course supersedes every lower certificate limit once the formula is applied

Question 5

At comparable steam load and excess oxygen, the operating log shows stack temperature rising from 430°F to 495°F over three weeks. Carbon monoxide remains normal and no alarm has occurred. Which investigation sequence is most appropriate?

Accepted Answer

Verify the instruments, then inspect fireside fouling, sootblowing, and combustion

Answer

Increase excess air until the stack temperature returns to its prior value

Answer

Raise the firing rate to compensate for the declining heat-transfer rate

Answer

Remove the boiler from service and request an emergency DOB inspection before checking the instruments or fireside condition

Question 6

Thickness readings on an air receiver are favorable, and the owner proposes raising its authorized MAWP from 150 to 175 psi without changing any metal. How is the proposal classified?

Accepted Answer

An alteration requiring design consideration and authorization

Answer

A repair because the receiver remains physically unchanged

Answer

A routine operating adjustment within the engineer's discretion

Answer

Maintenance if the safety valve is reset before pressure is increased

Question 7

During an outage, inspection reveals clusters of deep, sharply localized pits in economizer inlet tubes. Hard scale is absent, and the deaerator has been operating with inadequate venting. Which damage mechanism best fits the evidence?

Accepted Answer

Dissolved-oxygen corrosion caused by poor gas removal

Answer

Caustic gouging from concentrated alkalinity beneath waterside deposits

Answer

Flame impingement causing chronic overheating on the fireside tube surface

Answer

Erosion from excessive local velocity at a directional change

Question 8

A boiler safety valve is set at 200 psig. The steam-pressure gauge should read to approximately twice that setting and may not have a range below 1.5 times the setting. Select the most appropriate available gauge.

Accepted Answer

0 to 400 psig

Answer

0 to 250 psig

Answer

0 to 300 psig

Answer

0 to 600 psig

Question 9

A centrifugal feedwater pump develops gravel-like noise, vibration, and falling discharge head after deaerator level falls and water temperature rises. Which action addresses the underlying hydraulic condition rather than only the symptom?

Accepted Answer

Protect boiler level; restore deaerator level, reduce suction losses, and unload the pump

Answer

Throttle the suction valve further to increase velocity into the impeller

Answer

Increase pump speed until discharge pressure again exceeds boiler pressure

Answer

Continue at full load and schedule bearing replacement, treating the noise as a purely mechanical fault

Question 10

A defect cited during a high-pressure boiler inspection is corrected within the required 90-day period. Which filing action completes ordinary closeout?

Accepted Answer

File the subsequent report within 14 days after the correction

Answer

Record the repair in the operating log with no further filing

Answer

Wait and include the correction in the next annual inspection report

Answer

Submit another report only when the repair changes the authorized pressure

Free NYC-HPBOE Practice Questions

Domain 1: Administration

Question 1

Question 2

Question 3

Question 4

Domain 2: Inspection and Testing

Question 5

Question 6

Domain 3: Operation and Maintenance

Question 7

Question 8

Domain 4: Repairs and Alterations

Question 9

Question 10

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