CDC 3E151 VOL 2 HVAC/R JOURNEYMAN |ACTUAL
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
What affect will dust on fan blades have on heat transfer?
CORRECT ANSWER
It will reduce heat transfer.
Question 2
Where do you view the rotation and discharge of a centrifugal fan?
CORRECT ANSWER
On the drive side.
Question 3
Why are vanes used in the vane axial fan?
CORRECT ANSWER
To straighten out the spiraling motion of the air.
Question 4
What will allow a sheave to be used on different diameter shafts?
CORRECT ANSWER
Bushings.
1
,Question 5
Where will the classic V-belts (A through E) be used?
CORRECT ANSWER
Medium horsepower applications.
Question 6
If you have four belts and one is bad, how many should you replace?
CORRECT ANSWER
4.
Question 7
In a single-duct unit, why is the manual damper left in its initial position?
CORRECT ANSWER
To maintain a constant airflow through the box.
Question 8
Which design(s) do multiple-path systems use?
CORRECT ANSWER
Separate cold and warm air duct distribution systems or separate supply ducts to each zone.
Question 9
Why are multi-path, multi-zone systems limited to smaller areas?
2
, CORRECT ANSWER
Because of the multiple runs of single zone ducts.
Question 10
If a cooling demand is reduced in a building, what will the supply dampers do?
CORRECT ANSWER
Begin to close.
Question 11
What is one reason for the use of terminal reheat?
CORRECT ANSWER
Allow zone or space control for areas of unequal loading
Question 12
What makes an independent variable air volume (VAV) system truly independent?
CORRECT ANSWER
They can control the maximum and minimum cfm that can be supplied from the box.
Question 13
How do you prevent carryover into the ductwork while using atomizing sprays?
CORRECT ANSWER
Using an eliminator or filter.
3
QUESTIONS AND VERIFIED ANSWERS|BRAND NEW
2026-2027 UPDATE|GRADED A+
Question 1
What affect will dust on fan blades have on heat transfer?
CORRECT ANSWER
It will reduce heat transfer.
Question 2
Where do you view the rotation and discharge of a centrifugal fan?
CORRECT ANSWER
On the drive side.
Question 3
Why are vanes used in the vane axial fan?
CORRECT ANSWER
To straighten out the spiraling motion of the air.
Question 4
What will allow a sheave to be used on different diameter shafts?
CORRECT ANSWER
Bushings.
1
,Question 5
Where will the classic V-belts (A through E) be used?
CORRECT ANSWER
Medium horsepower applications.
Question 6
If you have four belts and one is bad, how many should you replace?
CORRECT ANSWER
4.
Question 7
In a single-duct unit, why is the manual damper left in its initial position?
CORRECT ANSWER
To maintain a constant airflow through the box.
Question 8
Which design(s) do multiple-path systems use?
CORRECT ANSWER
Separate cold and warm air duct distribution systems or separate supply ducts to each zone.
Question 9
Why are multi-path, multi-zone systems limited to smaller areas?
2
, CORRECT ANSWER
Because of the multiple runs of single zone ducts.
Question 10
If a cooling demand is reduced in a building, what will the supply dampers do?
CORRECT ANSWER
Begin to close.
Question 11
What is one reason for the use of terminal reheat?
CORRECT ANSWER
Allow zone or space control for areas of unequal loading
Question 12
What makes an independent variable air volume (VAV) system truly independent?
CORRECT ANSWER
They can control the maximum and minimum cfm that can be supplied from the box.
Question 13
How do you prevent carryover into the ductwork while using atomizing sprays?
CORRECT ANSWER
Using an eliminator or filter.
3
