NYC Health Hospitals Senior HVAC
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. During a scheduled preventive maintenance inspection at a large NYC
Health + Hospitals facility, a Senior HVAC Technician observes that a
supply air handling unit serving several patient care areas has
experienced a gradual decrease in airflow despite clean ductwork. The
differential pressure across the final filters has increased steadily over
several weeks, the supply fan amperage has decreased slightly, and
space temperatures are beginning to rise. What should be the
technician's first conclusion regarding these operating conditions?
A. The fan motor bearings are failing and drawing less current.
B. The air filters are becoming loaded with contaminants, increasing
,system resistance and reducing airflow.
C. The cooling coil has frozen because of low refrigerant charge.
D. The duct static pressure sensor has failed.
Rationale: As filters become loaded with dirt and particulate matter,
system resistance increases, reducing airflow through the air handler.
Lower airflow generally causes the fan to draw slightly less current while
differential pressure across the filters increases. Replacing the filters
restores airflow and system efficiency.
2. A centrifugal chilled-water pump begins producing excessive vibration
shortly after maintenance personnel replace a mechanical seal. The
pump was operating normally before maintenance. Which of the
following should the Senior HVAC Technician investigate first?
A. Improper refrigerant charge in the chiller
B. Pump and motor shaft misalignment after reassembly
C. Low condenser water temperature
D. Excess building cooling load
Rationale: Shaft misalignment commonly develops after maintenance
involving pump disassembly. Misalignment causes vibration, accelerates
bearing wear, damages seals, and reduces equipment life. Proper
alignment should always be verified following maintenance.
, 3. A hospital operating room requires precise environmental control to
minimize infection risk. Which ventilation characteristic is most critical
for maintaining a sterile surgical environment?
A. Negative room pressure
B. Maximum return air volume
C. Reduced outside air intake
D. Positive room pressure with HEPA-filtered supply air
Rationale: Operating rooms are maintained under positive pressure to
prevent contaminated air from entering adjacent spaces. HEPA-filtered
supply air removes airborne particles and microorganisms, supporting
infection prevention standards.
4. While troubleshooting a water-cooled centrifugal chiller, the Senior
HVAC Technician notices that condenser water entering temperature
has increased significantly above design conditions. Which effect will
most likely occur if the condition continues?
A. Lower compressor amperage
B. Reduced refrigerant head pressure
C. Higher compressor workload and reduced efficiency
D. Increased evaporator capacity
Rationale: Higher condenser water temperatures reduce the chiller's ability
to reject heat, increasing compressor head pressure and power
consumption while lowering overall efficiency and cooling capacity.
, 5. During a Building Automation System (BAS) trend review, discharge air
temperature fluctuates rapidly even though space temperature
remains relatively stable. Which control issue is the most likely cause?
A. Dirty evaporator coil
B. Refrigerant migration
C. Poorly tuned PID control loop causing hunting
D. Frozen chilled-water piping
Rationale: Improper PID tuning can cause control hunting, where dampers
or valves continually overcorrect, resulting in unstable discharge air
temperatures despite stable room conditions.
6. An isolation room intended for airborne infectious patients must be
verified before patient occupancy. Which condition confirms proper
operation?
A. Positive pressure relative to corridor
B. Equal pressure with adjacent hallway
C. Negative pressure continuously maintained relative to adjacent spaces
D. Supply airflow greater than exhaust airflow
Rationale: Airborne infection isolation rooms require continuous negative
pressure so that air flows into the room rather than out, preventing
contaminated air from escaping into surrounding areas.
7. A Senior HVAC Technician observes repeated nuisance trips of a VFD
supplying an air handler. Electrical testing reveals normal incoming
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. During a scheduled preventive maintenance inspection at a large NYC
Health + Hospitals facility, a Senior HVAC Technician observes that a
supply air handling unit serving several patient care areas has
experienced a gradual decrease in airflow despite clean ductwork. The
differential pressure across the final filters has increased steadily over
several weeks, the supply fan amperage has decreased slightly, and
space temperatures are beginning to rise. What should be the
technician's first conclusion regarding these operating conditions?
A. The fan motor bearings are failing and drawing less current.
B. The air filters are becoming loaded with contaminants, increasing
,system resistance and reducing airflow.
C. The cooling coil has frozen because of low refrigerant charge.
D. The duct static pressure sensor has failed.
Rationale: As filters become loaded with dirt and particulate matter,
system resistance increases, reducing airflow through the air handler.
Lower airflow generally causes the fan to draw slightly less current while
differential pressure across the filters increases. Replacing the filters
restores airflow and system efficiency.
2. A centrifugal chilled-water pump begins producing excessive vibration
shortly after maintenance personnel replace a mechanical seal. The
pump was operating normally before maintenance. Which of the
following should the Senior HVAC Technician investigate first?
A. Improper refrigerant charge in the chiller
B. Pump and motor shaft misalignment after reassembly
C. Low condenser water temperature
D. Excess building cooling load
Rationale: Shaft misalignment commonly develops after maintenance
involving pump disassembly. Misalignment causes vibration, accelerates
bearing wear, damages seals, and reduces equipment life. Proper
alignment should always be verified following maintenance.
, 3. A hospital operating room requires precise environmental control to
minimize infection risk. Which ventilation characteristic is most critical
for maintaining a sterile surgical environment?
A. Negative room pressure
B. Maximum return air volume
C. Reduced outside air intake
D. Positive room pressure with HEPA-filtered supply air
Rationale: Operating rooms are maintained under positive pressure to
prevent contaminated air from entering adjacent spaces. HEPA-filtered
supply air removes airborne particles and microorganisms, supporting
infection prevention standards.
4. While troubleshooting a water-cooled centrifugal chiller, the Senior
HVAC Technician notices that condenser water entering temperature
has increased significantly above design conditions. Which effect will
most likely occur if the condition continues?
A. Lower compressor amperage
B. Reduced refrigerant head pressure
C. Higher compressor workload and reduced efficiency
D. Increased evaporator capacity
Rationale: Higher condenser water temperatures reduce the chiller's ability
to reject heat, increasing compressor head pressure and power
consumption while lowering overall efficiency and cooling capacity.
, 5. During a Building Automation System (BAS) trend review, discharge air
temperature fluctuates rapidly even though space temperature
remains relatively stable. Which control issue is the most likely cause?
A. Dirty evaporator coil
B. Refrigerant migration
C. Poorly tuned PID control loop causing hunting
D. Frozen chilled-water piping
Rationale: Improper PID tuning can cause control hunting, where dampers
or valves continually overcorrect, resulting in unstable discharge air
temperatures despite stable room conditions.
6. An isolation room intended for airborne infectious patients must be
verified before patient occupancy. Which condition confirms proper
operation?
A. Positive pressure relative to corridor
B. Equal pressure with adjacent hallway
C. Negative pressure continuously maintained relative to adjacent spaces
D. Supply airflow greater than exhaust airflow
Rationale: Airborne infection isolation rooms require continuous negative
pressure so that air flows into the room rather than out, preventing
contaminated air from escaping into surrounding areas.
7. A Senior HVAC Technician observes repeated nuisance trips of a VFD
supplying an air handler. Electrical testing reveals normal incoming
