Louisiana Class D Chauffeur’s License Complete Practice Questions & Answers – 2026/2027 OMV Driver’s Manual Study Guide (Pass on First Try)

Louisiana Class D Chauffeur’s License – Complete
Practice Questions & Answers


This comprehensive guide is designed to help you pass the Louisiana Class
D Chauffeur’s License exam. The exam covers vehicle size and dimension
limits, load securement requirements, speed limits, and mandatory
equipment, all based on the Louisiana Driver’s Guide and the Louisiana
Administrative Code .

Question 1
What is the minimum age required to obtain a Class D Chauffeur's License in Louisiana?
A. 16 years old
B. 17 years old
C. 18 years old
D. 21 years old

*Correct Answer: B. 17 years old. *

Rationale: Louisiana law requires that a person be 17 years of age or above to obtain a
Class D Chauffeur’s License .




Question 2
Vehicles transporting passengers must be equipped with which type of fire
extinguisher?
A. 1-BC
B. 2-BC
C. 4-BC
D. 10-BC

*Correct Answer: B. 2-BC. *

Rationale: Passenger vehicles require a 2-BC fire extinguisher. Tow trucks require 4-BC,
and vehicles transporting explosives require 10-BC .

,Question 3
Vehicles transporting explosives must be equipped with which type of fire extinguisher?
A. 1-BC
B. 2-BC
C. 4-BC
D. 10-BC

*Correct Answer: D. 10-BC. *

Rationale: Vehicles transporting explosives require a 10-BC fire extinguisher, completely
filled and in working condition .




Question 4
The three braking systems that make up an air brake system are:
A. Service brake, parking brake, and emergency brake
B. Front brake, rear brake, and side brake
C. Hydraulic, pneumatic, and electric brake
D. Primary, secondary, and auxiliary brake

*Correct Answer: A. Service brake, parking brake, and emergency brake. *

Rationale: The three braking systems that make up an air brake system are the service
brake, parking brake, and emergency brake .




Question 5
The part of the air brake system which pumps air into the air storage tanks is the:
A. Air compressor governor
B. Air compressor
C. Safety valve
D. Manual air tank drain

*Correct Answer: B. Air compressor. *

,Rationale: The air compressor pumps air into the air storage tanks .




Question 6
The part of the air brake system which controls when the air compressor will pump air
into the air storage tanks is the:
A. Air compressor governor
B. Safety valve
C. Manual air tank drain
D. Automatic air tank drain

*Correct Answer: A. Air compressor governor. *

Rationale: The air compressor governor controls when the air compressor will pump air
into the air storage tanks .




Question 7
The part of the air brake system which must be drained manually at the end of the day
is the:
A. Automatic air tank drain
B. Air compressor governor
C. Manual air tank drain
D. Safety valve

*Correct Answer: C. Manual air tank drain. *

Rationale: The manual air tank drain is operated by turning a quarter turn or pulling a
cable and must be drained manually at the end of the day .




Question 8
The part of the air brake system in which water and oil are automatically expelled is the:
A. Manual air tank drain
B. Automatic air tank drain

, C. Safety valve
D. Air compressor governor

*Correct Answer: B. Automatic air tank drain. *

Rationale: The automatic air tank drain automatically expels water and oil .




Question 9
The safety valve of the air brake system protects the tanks and the rest of the system
from too much pressure. It is usually set at:
A. 100 psi
B. 125 psi
C. 150 psi
D. 200 psi

*Correct Answer: C. 150 psi. *

Rationale: The safety valve protects the tanks and the rest of the system from too much
pressure and is usually set at 150 psi. If it releases air, something is wrong .




Question 10
If the air pressure in the tanks falls below what level, will the low air pressure warning
come on?
A. 40 psi
B. 50 psi
C. 60 psi
D. 70 psi

*Correct Answer: C. 60 psi. *

Rationale: If the air pressure in the tanks falls below 60 psi, the low air pressure warning
will come on .