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Contractor Licensing · 1.9

Louisiana Contractor Pneumatic Tubes and Conveyors Trade Examination Practice Test

Pneumatic tube and conveyor work involves moving carriers or bulk materials through systems powered by air pressure or vacuum. This practice material samples field decisions about receiver tanks, line drainage, carrier fit, station cushioning, fan operation, vibration isolation, and noise control, along with grounding and bonding where combustible dust may be present.

Exam overview

Exam providerLouisiana State Licensing Board for Contractors
Exam code1.9
CategoryContractor Licensing

About the Louisiana Contractor Pneumatic Tubes and Conveyors Trade Examination Exam

Questions address how system components support safe, reliable material movement and how installers or technicians verify their operation. Relevant tasks include matching replacement carriers to station dimensions, providing for condensate at low points, and understanding the receiver tank’s role in a conveying arrangement. Other scenarios involve isolating stored pneumatic or electrical energy before service, checking that a fan turns in the intended direction, and confirming a diverter’s commanded position. Installation decisions also include preventing vibration transfer through connected ductwork, reducing noise near occupied spaces, and grounding or bonding conductive parts when combustible dust creates an ignition concern. These subjects call for reading equipment conditions, identifying the purpose of components, and selecting practical checks or safeguards before startup and maintenance.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

What is the principal purpose of grounding and bonding conductive components used to handle combustible dust?

  1. ATo reduce the buildup of static charge that could produce an ignition spark
  2. BTo increase the material's moisture content
  3. CTo make the conveying air flow faster
  4. DTo prevent all mechanical wear at bends
Show answerCorrect answer: A

Grounding and bonding provide a path for dissipating static charge and reducing potential differences between conductive components. They are part of a broader combustible-dust hazard-control program, not a substitute for it.

Question 2

A pneumatic tube installation includes a station designed for a specific carrier size. What should be verified when ordering replacement carriers?

  1. AThat the carrier type and dimensions are compatible with the station and system manufacturer’s specifications
  2. BThat the carrier is heavier than the original so it travels more reliably
  3. CThat the carrier seals completely airtight against the tube wall
  4. DThat the carrier’s exterior is rough enough to grip the tube
Show answerCorrect answer: A

Compatible carrier dimensions and construction support reliable travel, sealing, and station operation. An oversized, excessively heavy, or poorly suited carrier can increase friction or damage components.

Question 3

A pneumatic conveying line has a low point where condensed liquid could collect. What is a sound installation measure?

  1. AProvide a suitable means to drain accumulated liquid and arrange the line to avoid unintended pockets where practical
  2. BPlace a blind cap at the low point so liquid cannot escape
  3. CIncrease the number of sharp elbows near the low point
  4. DUse a smaller pipe downstream to keep liquid suspended
Show answerCorrect answer: A

Liquid accumulation can contribute to corrosion, blockage, or delivery of moisture into equipment. Suitable drainage and sensible routing help manage condensate; any drain must be appropriate for the system’s pressure and service.

Question 4

What is the primary purpose of a receiver tank in a pneumatic conveying system?

  1. ATo store compressed air and help smooth pressure fluctuations
  2. BTo remove all particulate matter from the conveyed material
  3. CTo increase the pipe diameter at each branch
  4. DTo measure the mass flow rate of solids
Show answerCorrect answer: A

A receiver provides a reservoir of compressed air and helps reduce pressure fluctuations in the air supply. It does not replace material separation or flow-measurement equipment.

Question 5

Before servicing a pneumatic conveyor, what is the safest general approach to stored energy?

  1. AIsolate energy sources, lock and tag them, and verify zero energy before work
  2. BLeave the air supply on so controls remain responsive
  3. COpen a line fitting to release pressure while standing in front of it
  4. DDisable only the control-panel indicator lights
Show answerCorrect answer: A

Compressed air and moving equipment can retain hazardous energy. Proper isolation, lockout/tagout, and verification help prevent unexpected startup or release of pressure; site procedures and applicable rules must be followed.

Question 6

A pneumatic tube station repeatedly sends carriers that arrive with little impact cushioning. Which component should be inspected first for proper operation?

  1. AThe station’s deceleration or braking device
  2. BThe compressor intake silencer
  3. CThe line’s drain trap
  4. DThe carrier identification label
Show answerCorrect answer: A

A station braking or deceleration device reduces carrier speed near delivery, limiting impact and protecting the carrier and receiving equipment. The other components do not ordinarily control arrival speed.

Question 7

A pneumatic tube station is being installed in a room where its operating noise could affect nearby occupants. Which measure is most appropriate?

  1. AInstall acoustic treatment or an enclosure suited to the equipment, while preserving required ventilation and service access
  2. BSeal all ventilation openings around the station to contain sound
  3. CReduce the tube diameter to lower noise without checking system design
  4. DPlace sound-absorbing material inside the carrier path
Show answerCorrect answer: A

Acoustic treatment can reduce noise while the equipment still receives adequate cooling and remains accessible for maintenance. Changes to the tube path or blocking ventilation can impair operation or create hazards.

How to use this practice test

Access is free. Each practice session draws up to 20 random questions from the 50-question bank and displays results after you finish. Use the scenarios to check how you apply pneumatic-system concepts to installation, inspection, operation, and service decisions.

Preparation tips

  • Compare carrier dimensions with station specifications before selecting replacement carriers; consider fit through the complete route, not just at the station.
  • For conveying lines with low points, identify where condensate can collect and consider how the installation allows it to drain or be removed.
  • Trace the receiver tank’s connection to the conveying system and distinguish its role from that of the fan or blower.
  • Before service, identify stored pneumatic and electrical energy sources and determine how equipment can be safely isolated and verified de-energized.
  • Practice linking field symptoms to checks: fan rotation, diverter position, carrier cushioning, vibration at duct connections, and grounding or bonding continuity.
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