NYC CUSTODIAN ENGINEER EXAM PREP
SOLVED QUESTIONS ACCURATE ANSWERS
PREMIUM REVIEW
◉ What should an operator do if no water is visible in the gauge
glass of a steam boiler?
Answer: Shut the burner down and determine true water level
◉ What is the purpose of the low-water cutoff?
Answer: To shut off fuel when water falls below a safe level
◉ What can cause a float-type LWCO to fail?
Answer: Sludge or scale in the chamber
◉ What does the gauge glass show in a boiler?
Answer: Water level
◉ What does blowing down the water column help confirm?
Answer: That the level passages are open and accurate
◉ How is the operating pressure controlled on a steam boiler?
,Answer: By the pressure control
◉ What is the operating control for temperature on a hot-water
boiler?
Answer: Aquastat
◉ What does the safety valve protect the boiler from?
Answer: Overpressure
◉ What should never be done to a safety valve in service?
Answer: It should never be plugged or isolated
◉ What can scale buildup in an LWCO chamber cause?
Answer: False level sensing
◉ What is the purpose of bottom blowdown?
Answer: To remove sediment from low points
◉ What does the water column connect in a boiler?
Answer: The boiler to the gauge glass and low-water controls
◉ How is a pressure control used for normal cycling different?
,Answer: It is different from the safety high-limit device
◉ What does frequent lifting of a safety valve usually indicate?
Answer: Another problem such as control failure or overfiring
◉ Why can a clogged gauge glass connection be dangerous?
Answer: It may show a false normal water level
◉ What is the purpose of the feedwater system?
Answer: To maintain safe boiler water level
◉ How does a steam boiler differ from a hot-water boiler?
Answer: It produces steam for distribution
◉ What should NOT be done if a nuisance trip occurs on an LWCO?
Answer: The control should NOT be bypassed as a normal response
◉ What can poor heat transfer in a boiler result from?
Answer: Scale and sediment buildup
◉ What is the function of a fuse in a circuit?
Answer: To melt open during overcurrent
, ◉ What is the best action if a breaker keeps tripping?
Answer: Find and correct the cause
◉ What does grounding mainly help with?
Answer: Stabilizing the system and reducing shock hazards
◉ What is bonding in electrical systems?
Answer: Connecting metal parts together so that fault current can
clear safely
◉ What is the main purpose of a GFCI?
Answer: To protect people from ground-fault shock hazards
◉ How should a warm receptacle with scorch marks be treated?
Answer: As a likely overheating or arcing hazard
◉ What is emergency lighting considered?
Answer: Life-safety equipment
◉ What should exit signs do?
Answer: Remain illuminated and maintained
SOLVED QUESTIONS ACCURATE ANSWERS
PREMIUM REVIEW
◉ What should an operator do if no water is visible in the gauge
glass of a steam boiler?
Answer: Shut the burner down and determine true water level
◉ What is the purpose of the low-water cutoff?
Answer: To shut off fuel when water falls below a safe level
◉ What can cause a float-type LWCO to fail?
Answer: Sludge or scale in the chamber
◉ What does the gauge glass show in a boiler?
Answer: Water level
◉ What does blowing down the water column help confirm?
Answer: That the level passages are open and accurate
◉ How is the operating pressure controlled on a steam boiler?
,Answer: By the pressure control
◉ What is the operating control for temperature on a hot-water
boiler?
Answer: Aquastat
◉ What does the safety valve protect the boiler from?
Answer: Overpressure
◉ What should never be done to a safety valve in service?
Answer: It should never be plugged or isolated
◉ What can scale buildup in an LWCO chamber cause?
Answer: False level sensing
◉ What is the purpose of bottom blowdown?
Answer: To remove sediment from low points
◉ What does the water column connect in a boiler?
Answer: The boiler to the gauge glass and low-water controls
◉ How is a pressure control used for normal cycling different?
,Answer: It is different from the safety high-limit device
◉ What does frequent lifting of a safety valve usually indicate?
Answer: Another problem such as control failure or overfiring
◉ Why can a clogged gauge glass connection be dangerous?
Answer: It may show a false normal water level
◉ What is the purpose of the feedwater system?
Answer: To maintain safe boiler water level
◉ How does a steam boiler differ from a hot-water boiler?
Answer: It produces steam for distribution
◉ What should NOT be done if a nuisance trip occurs on an LWCO?
Answer: The control should NOT be bypassed as a normal response
◉ What can poor heat transfer in a boiler result from?
Answer: Scale and sediment buildup
◉ What is the function of a fuse in a circuit?
Answer: To melt open during overcurrent
, ◉ What is the best action if a breaker keeps tripping?
Answer: Find and correct the cause
◉ What does grounding mainly help with?
Answer: Stabilizing the system and reducing shock hazards
◉ What is bonding in electrical systems?
Answer: Connecting metal parts together so that fault current can
clear safely
◉ What is the main purpose of a GFCI?
Answer: To protect people from ground-fault shock hazards
◉ How should a warm receptacle with scorch marks be treated?
Answer: As a likely overheating or arcing hazard
◉ What is emergency lighting considered?
Answer: Life-safety equipment
◉ What should exit signs do?
Answer: Remain illuminated and maintained
