Utah S350 HVAC Contractor
Examination Most Tested Questions
Collection & Verified Detailed Answers
With Rationales| Tutor Verified Success
Exam) Graded A+
Part I — HVAC Fundamentals
1. What is the primary purpose of an HVAC system?
A. To increase electrical consumption
B. To control indoor environmental conditions
C. To eliminate all humidity
D. To eliminate outdoor air
Answer: B. To control indoor environmental conditions
HVAC systems provide heating, cooling, ventilation, humidity control,
and air movement to maintain acceptable indoor conditions.
2. Which unit is commonly used to express cooling capacity?
A. Watt-hour
B. BTU per hour
C. Ohm
D. Cubic foot
Answer: B. BTU per hour
A BTU/h expresses the rate of heat removal or addition. One
refrigeration ton is conventionally equal to 12,000 BTU/h.
,3. One refrigeration ton is approximately equal to:
A. 1,200 BTU/h
B. 6,000 BTU/h
C. 12,000 BTU/h
D. 24,000 BTU/h
Answer: C. 12,000 BTU/h
One ton of refrigeration represents approximately 12,000 BTU/h of
cooling capacity.
4. Sensible heat is heat that:
A. Changes moisture content only
B. Changes temperature without changing phase
C. Always causes boiling
D. Cannot be measured
Answer: B. Changes temperature without changing phase
Sensible heat changes temperature while latent heat is associated
with a change in moisture or phase.
5. Latent heat is primarily associated with:
A. Temperature change only
B. Electrical resistance
C. Moisture or phase change
D. Air velocity
Answer: C. Moisture or phase change
,Latent heat is involved when water changes between solid, liquid,
and vapor states without a corresponding sensible-temperature
change.
6. What instrument is commonly used to measure air temperature?
A. Manometer
B. Thermometer
C. Megohmmeter
D. Micrometer
Answer: B. Thermometer
A thermometer measures temperature, while a manometer measures
pressure.
7. Static pressure in an HVAC duct system is commonly measured
with a:
A. Manometer
B. Tachometer
C. Hygrometer
D. Thermocouple
Answer: A. Manometer
A manometer can measure small pressure differences commonly
encountered in HVAC systems.
8. Relative humidity is the:
A. Weight of air in a room
B. Ratio of actual moisture to the maximum moisture air can hold at
a given temperature
, C. Temperature of saturated air only
D. Velocity of water vapor
Answer: B. Ratio of actual moisture to the maximum moisture air
can hold at a given temperature
Relative humidity compares the moisture present with the moisture-
holding capacity of air at that temperature.
9. As air temperature increases, its ability to hold water vapor
generally:
A. Decreases
B. Remains exactly constant
C. Increases
D. Becomes zero
Answer: C. Increases
Warmer air can hold more water vapor before reaching saturation.
10. The process by which water vapor becomes liquid water is:
A. Evaporation
B. Sublimation
C. Condensation
D. Fusion
Answer: C. Condensation
Condensation occurs when water vapor changes into liquid water.
11. The primary purpose of an evaporator in an air-conditioning
system is to:
Examination Most Tested Questions
Collection & Verified Detailed Answers
With Rationales| Tutor Verified Success
Exam) Graded A+
Part I — HVAC Fundamentals
1. What is the primary purpose of an HVAC system?
A. To increase electrical consumption
B. To control indoor environmental conditions
C. To eliminate all humidity
D. To eliminate outdoor air
Answer: B. To control indoor environmental conditions
HVAC systems provide heating, cooling, ventilation, humidity control,
and air movement to maintain acceptable indoor conditions.
2. Which unit is commonly used to express cooling capacity?
A. Watt-hour
B. BTU per hour
C. Ohm
D. Cubic foot
Answer: B. BTU per hour
A BTU/h expresses the rate of heat removal or addition. One
refrigeration ton is conventionally equal to 12,000 BTU/h.
,3. One refrigeration ton is approximately equal to:
A. 1,200 BTU/h
B. 6,000 BTU/h
C. 12,000 BTU/h
D. 24,000 BTU/h
Answer: C. 12,000 BTU/h
One ton of refrigeration represents approximately 12,000 BTU/h of
cooling capacity.
4. Sensible heat is heat that:
A. Changes moisture content only
B. Changes temperature without changing phase
C. Always causes boiling
D. Cannot be measured
Answer: B. Changes temperature without changing phase
Sensible heat changes temperature while latent heat is associated
with a change in moisture or phase.
5. Latent heat is primarily associated with:
A. Temperature change only
B. Electrical resistance
C. Moisture or phase change
D. Air velocity
Answer: C. Moisture or phase change
,Latent heat is involved when water changes between solid, liquid,
and vapor states without a corresponding sensible-temperature
change.
6. What instrument is commonly used to measure air temperature?
A. Manometer
B. Thermometer
C. Megohmmeter
D. Micrometer
Answer: B. Thermometer
A thermometer measures temperature, while a manometer measures
pressure.
7. Static pressure in an HVAC duct system is commonly measured
with a:
A. Manometer
B. Tachometer
C. Hygrometer
D. Thermocouple
Answer: A. Manometer
A manometer can measure small pressure differences commonly
encountered in HVAC systems.
8. Relative humidity is the:
A. Weight of air in a room
B. Ratio of actual moisture to the maximum moisture air can hold at
a given temperature
, C. Temperature of saturated air only
D. Velocity of water vapor
Answer: B. Ratio of actual moisture to the maximum moisture air
can hold at a given temperature
Relative humidity compares the moisture present with the moisture-
holding capacity of air at that temperature.
9. As air temperature increases, its ability to hold water vapor
generally:
A. Decreases
B. Remains exactly constant
C. Increases
D. Becomes zero
Answer: C. Increases
Warmer air can hold more water vapor before reaching saturation.
10. The process by which water vapor becomes liquid water is:
A. Evaporation
B. Sublimation
C. Condensation
D. Fusion
Answer: C. Condensation
Condensation occurs when water vapor changes into liquid water.
11. The primary purpose of an evaporator in an air-conditioning
system is to:
