NYC Health Hospitals Supervising HVAC
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
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1. In a large NYC Health + Hospitals facility, the Supervising HVAC
Technician receives reports that several patient rooms in a critical care
unit are maintaining temperatures within the required range, but
humidity levels are consistently above design specifications. After
confirming that room thermostats are functioning correctly, which of
the following should be investigated first because it is most directly
responsible for controlling humidity?
A. Supply fan motor horsepower
B. Building lighting circuits
C. Cooling coil performance and chilled water or refrigerant conditions
D. Return air grille finish
,Rationale: Humidity removal primarily occurs as air passes over a properly
functioning cooling coil. If the coil temperature is not sufficiently low due to
inadequate chilled water flow, refrigerant issues, fouling, or control
problems, moisture removal decreases even when room temperatures
appear acceptable.
2. A hospital air-handling unit experiences increasing differential pressure
across the filter bank. What is the most appropriate supervisory
action?
A. Increase supply fan speed indefinitely
B. Disable the filter differential pressure alarm
C. Schedule filter replacement while monitoring airflow and system
performance
D. Close all outside air dampers
Rationale: Rising pressure drop across filters indicates loading. Replacing
filters restores airflow, improves energy efficiency, and maintains indoor air
quality while avoiding unnecessary stress on the fan system.
3. A supervisory HVAC technician reviewing maintenance records notices
repeated failures of the same chilled water pump bearing. Which
action best reflects effective preventive maintenance management?
A. Continue replacing bearings only
B. Ignore the failures until pump replacement
C. Investigate root causes such as alignment, lubrication, vibration, and
,operating conditions
D. Increase pump operating speed
Rationale: Repeated failures indicate an underlying issue. Supervisors
should identify and eliminate the root cause rather than repeatedly
replacing failed components.
4. During an inspection of a VAV system, several terminal boxes fail to
respond to thermostat adjustments. Which component should be
checked first?
A. Chilled water expansion tank
B. Steam trap
C. Actuator and control signal
D. Cooling tower fill
Rationale: VAV box operation depends on a functioning actuator receiving
the proper control signal. Mechanical or electrical failures at this point
commonly prevent damper movement.
5. Which maintenance activity most effectively improves the efficiency of
an air-cooled condenser?
A. Painting the condenser housing
B. Tightening electrical conduit straps
C. Cleaning condenser coils to improve heat transfer
D. Increasing refrigerant pressure
, Rationale: Dirty condenser coils reduce heat rejection, increasing
compressor workload and energy consumption. Cleaning restores efficient
heat transfer.
6. A centrifugal fan begins producing excessive vibration after scheduled
maintenance. Which condition is the most likely cause?
A. Properly balanced wheel
B. Correct belt tension
C. Misalignment or an unbalanced rotating assembly
D. Closed access doors
Rationale: Excessive vibration following maintenance commonly results
from improper alignment, wheel imbalance, or incorrect installation
procedures.
7. Which HVAC system component prevents reverse refrigerant flow
when the compressor stops?
A. Receiver
B. Accumulator
C. Check valve
D. Sight glass
Rationale: Check valves permit refrigerant flow in one direction and
prevent reverse migration that could negatively affect system operation.
Technician Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. In a large NYC Health + Hospitals facility, the Supervising HVAC
Technician receives reports that several patient rooms in a critical care
unit are maintaining temperatures within the required range, but
humidity levels are consistently above design specifications. After
confirming that room thermostats are functioning correctly, which of
the following should be investigated first because it is most directly
responsible for controlling humidity?
A. Supply fan motor horsepower
B. Building lighting circuits
C. Cooling coil performance and chilled water or refrigerant conditions
D. Return air grille finish
,Rationale: Humidity removal primarily occurs as air passes over a properly
functioning cooling coil. If the coil temperature is not sufficiently low due to
inadequate chilled water flow, refrigerant issues, fouling, or control
problems, moisture removal decreases even when room temperatures
appear acceptable.
2. A hospital air-handling unit experiences increasing differential pressure
across the filter bank. What is the most appropriate supervisory
action?
A. Increase supply fan speed indefinitely
B. Disable the filter differential pressure alarm
C. Schedule filter replacement while monitoring airflow and system
performance
D. Close all outside air dampers
Rationale: Rising pressure drop across filters indicates loading. Replacing
filters restores airflow, improves energy efficiency, and maintains indoor air
quality while avoiding unnecessary stress on the fan system.
3. A supervisory HVAC technician reviewing maintenance records notices
repeated failures of the same chilled water pump bearing. Which
action best reflects effective preventive maintenance management?
A. Continue replacing bearings only
B. Ignore the failures until pump replacement
C. Investigate root causes such as alignment, lubrication, vibration, and
,operating conditions
D. Increase pump operating speed
Rationale: Repeated failures indicate an underlying issue. Supervisors
should identify and eliminate the root cause rather than repeatedly
replacing failed components.
4. During an inspection of a VAV system, several terminal boxes fail to
respond to thermostat adjustments. Which component should be
checked first?
A. Chilled water expansion tank
B. Steam trap
C. Actuator and control signal
D. Cooling tower fill
Rationale: VAV box operation depends on a functioning actuator receiving
the proper control signal. Mechanical or electrical failures at this point
commonly prevent damper movement.
5. Which maintenance activity most effectively improves the efficiency of
an air-cooled condenser?
A. Painting the condenser housing
B. Tightening electrical conduit straps
C. Cleaning condenser coils to improve heat transfer
D. Increasing refrigerant pressure
, Rationale: Dirty condenser coils reduce heat rejection, increasing
compressor workload and energy consumption. Cleaning restores efficient
heat transfer.
6. A centrifugal fan begins producing excessive vibration after scheduled
maintenance. Which condition is the most likely cause?
A. Properly balanced wheel
B. Correct belt tension
C. Misalignment or an unbalanced rotating assembly
D. Closed access doors
Rationale: Excessive vibration following maintenance commonly results
from improper alignment, wheel imbalance, or incorrect installation
procedures.
7. Which HVAC system component prevents reverse refrigerant flow
when the compressor stops?
A. Receiver
B. Accumulator
C. Check valve
D. Sight glass
Rationale: Check valves permit refrigerant flow in one direction and
prevent reverse migration that could negatively affect system operation.
