NYC DCAS Plant Maintainer (Hospitals) Exam
2026/2027 | ACTUAL-Style Practice Questions &
Answers, Exam No. 7070, NYC Health + Hospitals
Boiler Operations, Pumps, HVAC, Equipment
Maintenance, Safety, and Detailed Rationales
Question 1: In a hospital high-pressure boiler system, what is the
primary purpose of the low-water cutoff control?
A. To regulate the burner firing rate based on steam demand
B. To automatically shut off the burner when water level falls below a safe
minimum
C. To maintain the boiler drum pressure at a constant setpoint
D. To control the feedwater pump speed during normal operation
CORRECT ANSWER: B. To automatically shut off the burner when water
level falls below a safe minimum
Rationale: The low-water cutoff is a critical safety device designed to
prevent boiler overheating and catastrophic failure by stopping combustion
when the water level drops below the visible range in the gauge glass.
Options A and D describe normal operational controls, while option C
describes a pressure control function, not a low-water safety interlock.
Question 2: A plant maintainer observes that a centrifugal pump
serving the hospital heating loop is making a crackling, grinding noise
and has lost its prime. Which condition is the most likely cause?
A. The discharge valve is fully open
B. Cavitation due to low suction pressure or air ingress
C. The motor voltage is excessively high
D. The pump packing is too loose
CORRECT ANSWER: B. Cavitation due to low suction pressure or air
ingress
Rationale: Cavitation occurs when vapor bubbles form and collapse within
the pump, producing noise and loss of prime, typically caused by restricted
suction, low inlet pressure, or air entering the system. A fully open
discharge valve (A) is normal operation, high voltage (C) would not cause
these symptoms, and loose packing (D) would cause leakage, not
cavitation noise.
,Question 3: When performing preventive maintenance on a hospital's
emergency generator, which task is essential to verify the unit can
assume the facility's critical electrical load during an outage?
A. Painting the exterior enclosure to prevent corrosion
B. Replacing the starting battery on a fixed annual schedule regardless of
test results
C. Conducting load bank testing under simulated demand conditions
D. Adjusting the governor setting weekly without documentation
CORRECT ANSWER: C. Conducting load bank testing under simulated
demand conditions
Rationale: Load bank testing applies a controlled electrical load to the
generator, verifying that the engine, alternator, and cooling systems can
sustain the required capacity during an actual power failure. Cosmetic
painting (A) is unrelated to performance, battery replacement should be
condition-based or per manufacturer guidance rather than arbitrary (B),
and undocumented governor adjustments (D) can introduce reliability
risks.
Question 4: What is the primary function of a HEPA filter in a hospital
HVAC system?
A. To remove odors from recirculated air
B. To regulate space temperature and humidity
C. To capture airborne particles and pathogens at high efficiency
D. To control the speed of the supply fan
CORRECT ANSWER: C. To capture airborne particles and pathogens at
high efficiency
Rationale: HEPA filters are designed to trap at least 99.97% of particles at
0.3 microns, which is essential for infection control in patient-care areas.
Odor removal (A) is typically handled by carbon filters, temperature and
humidity (B) are controlled by the HVAC system's heating/cooling and
humidification components, and fan speed (D) is controlled by variable
frequency drives or motor controllers.
Question 5: During a routine inspection, a plant maintainer finds ice
buildup on the evaporator coil of a hospital air-conditioning unit. Which
condition most likely explains this finding?
,A. The refrigerant charge is low or airflow across the coil is restricted
B. The outdoor ambient temperature is below freezing
C. The thermostat setpoint is too high
D. The condenser fan is operating at maximum speed
CORRECT ANSWER: A. The refrigerant charge is low or airflow across
the coil is restricted
Rationale: Ice on the evaporator coil indicates that the coil temperature
has dropped below the freezing point of water, commonly caused by
insufficient refrigerant (reducing suction pressure) or restricted airflow from
clogged filters or blocked vents. Outdoor temperature (B) does not directly
cause indoor evaporator icing without an underlying fault, a high setpoint
(C) would reduce cooling demand, and maximum condenser fan speed (D)
would improve heat rejection and help prevent icing.
Question 6: When a hospital maintenance worker discovers an
electrical outlet in a patient room is not providing power and the circuit
breaker is in the "on" position, what is the appropriate first step?
A. Replace the circuit breaker immediately
B. Check whether a upstream GFCI device has tripped and reset it if
necessary
C. Rewire the outlet to a different circuit
D. Remove the outlet from service without further inspection
CORRECT ANSWER: B. Check whether a upstream GFCI device has
tripped and reset it if necessary
Rationale: Hospital patient-care areas frequently use GFCI protection, and
a tripped upstream GFCI will de-energize downstream receptacles even
when the panel breaker remains closed. Replacing the breaker (A) is
premature without diagnosis, rewiring (C) is unnecessary and potentially
hazardous, and removing the outlet (D) without inspection fails to identify
the actual cause.
Question 7: What is the purpose of the blowdown procedure on a
hospital boiler?
A. To increase steam pressure for sterilization equipment
B. To remove dissolved solids and sludge from the boiler water
, C. To add treatment chemicals to the feedwater
D. To rapidly cool the boiler after shutdown
CORRECT ANSWER: B. To remove dissolved solids and sludge from the
boiler water
Rationale: Blowdown removes concentrated impurities and sediment that
accumulate in the boiler drum, preventing scale formation, foaming, and
overheating of metal surfaces. It does not increase pressure (A), add
chemicals (C), or serve as a cooling method (D), all of which are incorrect
descriptions of the procedure's purpose.
Question 8: Which maintenance record document typically captures
the reported problem, work performed, materials used, labor, and
completion status for a hospital equipment repair?
A. Visitor log
B. Maintenance work order
C. Payroll register
D. Purchasing catalog
CORRECT ANSWER: B. Maintenance work order
Rationale: A work order is the standard administrative document used to
authorize, track, and close out maintenance activities, providing a
complete history of the task. Visitor logs (A) track individuals entering the
facility, payroll registers (C) record employee compensation, and
purchasing catalogs (D) list available supplies, none of which document
maintenance actions performed.
Question 9: In a hospital's medical gas system, which maintenance
task is most critical for safe operation?
A. Checking thermostat calibration in patient rooms
B. Verifying gas purity and delivery pressure at designated outlets
C. Replacing HVAC filters on a quarterly schedule
D. Adjusting the domestic hot water temperature
CORRECT ANSWER: B. Verifying gas purity and delivery pressure at
designated outlets
Rationale: Medical gas systems support patient respiration and life-critical
care, requiring strict verification of gas identity, purity, and pressure to
2026/2027 | ACTUAL-Style Practice Questions &
Answers, Exam No. 7070, NYC Health + Hospitals
Boiler Operations, Pumps, HVAC, Equipment
Maintenance, Safety, and Detailed Rationales
Question 1: In a hospital high-pressure boiler system, what is the
primary purpose of the low-water cutoff control?
A. To regulate the burner firing rate based on steam demand
B. To automatically shut off the burner when water level falls below a safe
minimum
C. To maintain the boiler drum pressure at a constant setpoint
D. To control the feedwater pump speed during normal operation
CORRECT ANSWER: B. To automatically shut off the burner when water
level falls below a safe minimum
Rationale: The low-water cutoff is a critical safety device designed to
prevent boiler overheating and catastrophic failure by stopping combustion
when the water level drops below the visible range in the gauge glass.
Options A and D describe normal operational controls, while option C
describes a pressure control function, not a low-water safety interlock.
Question 2: A plant maintainer observes that a centrifugal pump
serving the hospital heating loop is making a crackling, grinding noise
and has lost its prime. Which condition is the most likely cause?
A. The discharge valve is fully open
B. Cavitation due to low suction pressure or air ingress
C. The motor voltage is excessively high
D. The pump packing is too loose
CORRECT ANSWER: B. Cavitation due to low suction pressure or air
ingress
Rationale: Cavitation occurs when vapor bubbles form and collapse within
the pump, producing noise and loss of prime, typically caused by restricted
suction, low inlet pressure, or air entering the system. A fully open
discharge valve (A) is normal operation, high voltage (C) would not cause
these symptoms, and loose packing (D) would cause leakage, not
cavitation noise.
,Question 3: When performing preventive maintenance on a hospital's
emergency generator, which task is essential to verify the unit can
assume the facility's critical electrical load during an outage?
A. Painting the exterior enclosure to prevent corrosion
B. Replacing the starting battery on a fixed annual schedule regardless of
test results
C. Conducting load bank testing under simulated demand conditions
D. Adjusting the governor setting weekly without documentation
CORRECT ANSWER: C. Conducting load bank testing under simulated
demand conditions
Rationale: Load bank testing applies a controlled electrical load to the
generator, verifying that the engine, alternator, and cooling systems can
sustain the required capacity during an actual power failure. Cosmetic
painting (A) is unrelated to performance, battery replacement should be
condition-based or per manufacturer guidance rather than arbitrary (B),
and undocumented governor adjustments (D) can introduce reliability
risks.
Question 4: What is the primary function of a HEPA filter in a hospital
HVAC system?
A. To remove odors from recirculated air
B. To regulate space temperature and humidity
C. To capture airborne particles and pathogens at high efficiency
D. To control the speed of the supply fan
CORRECT ANSWER: C. To capture airborne particles and pathogens at
high efficiency
Rationale: HEPA filters are designed to trap at least 99.97% of particles at
0.3 microns, which is essential for infection control in patient-care areas.
Odor removal (A) is typically handled by carbon filters, temperature and
humidity (B) are controlled by the HVAC system's heating/cooling and
humidification components, and fan speed (D) is controlled by variable
frequency drives or motor controllers.
Question 5: During a routine inspection, a plant maintainer finds ice
buildup on the evaporator coil of a hospital air-conditioning unit. Which
condition most likely explains this finding?
,A. The refrigerant charge is low or airflow across the coil is restricted
B. The outdoor ambient temperature is below freezing
C. The thermostat setpoint is too high
D. The condenser fan is operating at maximum speed
CORRECT ANSWER: A. The refrigerant charge is low or airflow across
the coil is restricted
Rationale: Ice on the evaporator coil indicates that the coil temperature
has dropped below the freezing point of water, commonly caused by
insufficient refrigerant (reducing suction pressure) or restricted airflow from
clogged filters or blocked vents. Outdoor temperature (B) does not directly
cause indoor evaporator icing without an underlying fault, a high setpoint
(C) would reduce cooling demand, and maximum condenser fan speed (D)
would improve heat rejection and help prevent icing.
Question 6: When a hospital maintenance worker discovers an
electrical outlet in a patient room is not providing power and the circuit
breaker is in the "on" position, what is the appropriate first step?
A. Replace the circuit breaker immediately
B. Check whether a upstream GFCI device has tripped and reset it if
necessary
C. Rewire the outlet to a different circuit
D. Remove the outlet from service without further inspection
CORRECT ANSWER: B. Check whether a upstream GFCI device has
tripped and reset it if necessary
Rationale: Hospital patient-care areas frequently use GFCI protection, and
a tripped upstream GFCI will de-energize downstream receptacles even
when the panel breaker remains closed. Replacing the breaker (A) is
premature without diagnosis, rewiring (C) is unnecessary and potentially
hazardous, and removing the outlet (D) without inspection fails to identify
the actual cause.
Question 7: What is the purpose of the blowdown procedure on a
hospital boiler?
A. To increase steam pressure for sterilization equipment
B. To remove dissolved solids and sludge from the boiler water
, C. To add treatment chemicals to the feedwater
D. To rapidly cool the boiler after shutdown
CORRECT ANSWER: B. To remove dissolved solids and sludge from the
boiler water
Rationale: Blowdown removes concentrated impurities and sediment that
accumulate in the boiler drum, preventing scale formation, foaming, and
overheating of metal surfaces. It does not increase pressure (A), add
chemicals (C), or serve as a cooling method (D), all of which are incorrect
descriptions of the procedure's purpose.
Question 8: Which maintenance record document typically captures
the reported problem, work performed, materials used, labor, and
completion status for a hospital equipment repair?
A. Visitor log
B. Maintenance work order
C. Payroll register
D. Purchasing catalog
CORRECT ANSWER: B. Maintenance work order
Rationale: A work order is the standard administrative document used to
authorize, track, and close out maintenance activities, providing a
complete history of the task. Visitor logs (A) track individuals entering the
facility, payroll registers (C) record employee compensation, and
purchasing catalogs (D) list available supplies, none of which document
maintenance actions performed.
Question 9: In a hospital's medical gas system, which maintenance
task is most critical for safe operation?
A. Checking thermostat calibration in patient rooms
B. Verifying gas purity and delivery pressure at designated outlets
C. Replacing HVAC filters on a quarterly schedule
D. Adjusting the domestic hot water temperature
CORRECT ANSWER: B. Verifying gas purity and delivery pressure at
designated outlets
Rationale: Medical gas systems support patient respiration and life-critical
care, requiring strict verification of gas identity, purity, and pressure to
