CCT Pneumatic Principles & Air Flow Mechanics 3

Question 1

What is the primary cause of pressure loss in long Casper pneumatic tube runs?

Accepted Answer

Friction between the moving airstream and the interior tube wall surface

Answer

Friction between the moving air and the tube wall surface creates cumulative resistance (pressure loss) over long distances, requiring appropriately sized blowers.

Question 2

According to the continuity principle, how does increasing tube diameter affect air velocity when blower output (CFM) is constant?

Accepted Answer

Velocity decreases because the same air volume fills a larger cross-sectional area

Answer

The continuity equation (A × V = constant) shows that increasing cross-sectional area while keeping airflow volume constant must reduce velocity.

Question 3

In Casper pneumatic tube system airflow analysis, what does 'total pressure' equal?

Accepted Answer

Static pressure plus velocity (dynamic) pressure

Answer

Total pressure is the sum of static pressure (system resistance) and velocity pressure (kinetic energy of the moving air), representing the total energy of the airstream.

Question 4

Which two parameters are most critical when selecting a replacement blower for a Casper pneumatic tube system?

Accepted Answer

Required airflow volume (CFM) and static pressure capacity (in. WC or in. Hg)

Answer

Correct blower replacement requires matching both the required volumetric airflow (CFM) and the system's static pressure demands to ensure reliable carrier transport.

Question 5

What is the purpose of a check valve in a Casper pneumatic tube system?

Accepted Answer

To prevent reverse airflow and carrier backsliding when the blower shuts down

Answer

Check valves permit airflow in only one direction, preventing carriers from reversing or air from back-flowing when blowers cycle off between carrier transfers.

(CCT) Certified Casper Technician Practice Test

(CCT) Certified Casper Technician Practice Test

CCT Pneumatic Principles & Air Flow Mechanics 3