HVAC/R EXAMPREP 2026 COMPLETE
QUESTIONS AND ANSWERS GRADED A+
●● (201) Where do you view the rotation and discharge of a centrifugal
fan? Answer: On the drive side
●● (201) Why are vanes used in the vane axial fan? Answer: To
straighten out the spiraling motion of the air
●● (201) What will allow a sheave to be used on different diameter
shafts? Answer: Bushings
●● (201) Where will the classic V-belts ( A through E ) be used?
Answer: Medium horsepower applications
●● (201) If you have four belts and one is bad, how many should you
replace? Answer: 4
●● (202) In a single-duct unit, why is the manual damper left in its
initial position? Answer: To maintain a constant airflow through the box
●● (202) Which design(s) do multiple-path systems use? Answer:
Separate cold- and warm-air duct distribution systems or separate supply
duct to each zone
, ●● (202) Why are multi-path, multi-zone systems limited to smaller
areas? Answer: Because of the multiple runs of single-zone ducts
●● (202) If a cooling demand is reduced in a building, what will the
supply dampers do? Answer: Begin to close
●● (202) What is one reason for the use of terminal reheat? Answer:
Allow zone or space control for areas of unequal loading
●● (202) What makes an independent variable air volume (VAV) system
truly independent? Answer: They can control the maximum and
minimum cfm that can be supplied from the box
●● (203) How do you prevent carryover into the ductwork while using
atomizing sprays? Answer: Using an eliminator or filter
●● (203) When is the use of a return air system generally essential?
Answer: On larger systems
●● (203) What is the result of a dirty or clogged filter? Answer:
Resistance to flow and reduced efficiency
QUESTIONS AND ANSWERS GRADED A+
●● (201) Where do you view the rotation and discharge of a centrifugal
fan? Answer: On the drive side
●● (201) Why are vanes used in the vane axial fan? Answer: To
straighten out the spiraling motion of the air
●● (201) What will allow a sheave to be used on different diameter
shafts? Answer: Bushings
●● (201) Where will the classic V-belts ( A through E ) be used?
Answer: Medium horsepower applications
●● (201) If you have four belts and one is bad, how many should you
replace? Answer: 4
●● (202) In a single-duct unit, why is the manual damper left in its
initial position? Answer: To maintain a constant airflow through the box
●● (202) Which design(s) do multiple-path systems use? Answer:
Separate cold- and warm-air duct distribution systems or separate supply
duct to each zone
, ●● (202) Why are multi-path, multi-zone systems limited to smaller
areas? Answer: Because of the multiple runs of single-zone ducts
●● (202) If a cooling demand is reduced in a building, what will the
supply dampers do? Answer: Begin to close
●● (202) What is one reason for the use of terminal reheat? Answer:
Allow zone or space control for areas of unequal loading
●● (202) What makes an independent variable air volume (VAV) system
truly independent? Answer: They can control the maximum and
minimum cfm that can be supplied from the box
●● (203) How do you prevent carryover into the ductwork while using
atomizing sprays? Answer: Using an eliminator or filter
●● (203) When is the use of a return air system generally essential?
Answer: On larger systems
●● (203) What is the result of a dirty or clogged filter? Answer:
Resistance to flow and reduced efficiency
