Maryland Diesel Technician Certification
Exam Practice Questions And Correct
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1. Which regulatory body primarily oversees diesel emissions-related
technician certification programs in Maryland?
A. Maryland Department of Transportation
B. Maryland Department of Labor
C. Maryland Department of the Environment (MDE)
D. Maryland Department of the Environment (MDE)
The Maryland Department of the Environment is responsible for
administering and enforcing diesel emissions control programs and
certifying personnel involved in emissions compliance activities.
2. What is the main purpose of Maryland’s diesel emissions certification
programs?
A. To increase fuel taxes
B. To train commercial drivers only
C. To regulate vehicle manufacturing standards
D. To ensure compliance with emissions and environmental
standards
, These programs exist to ensure diesel vehicles meet environmental
emissions requirements and to reduce pollution through certified
inspection and repair processes.
3. Which type of facility is typically required for diesel emissions retester
certification work?
A. Residential garage
B. Small retail shop
C. Enclosed testing area meeting state specifications
D. Enclosed diesel repair facility or authorized inspection station
Certification work must be conducted in properly equipped and
approved facilities capable of safely testing heavy-duty diesel
vehicles.
4. What is a key responsibility of a Certified Diesel Emissions Retester
(CDER)?
A. Selling diesel fuel
B. Issuing vehicle registration plates
C. Designing engine components
D. Certifying compliance after emissions-related repairs
CDERs verify that repaired diesel vehicles meet emissions standards
and properly document compliance after testing.
5. Which tool is commonly required for diesel emissions testing
procedures in Maryland?
A. Timing light
B. Compression tester
C. OBD-II scanner only
D. Smokemeter
A smokemeter is used to measure diesel exhaust opacity and
determine whether emissions meet regulatory limits.
, 6. What minimum working requirement is typically expected for CDER
applicants?
A. 10 hours per week
B. 20 hours per week
C. 25 hours per week
D. At least 30 hours per week in an eligible facility
Applicants must work a minimum number of hours in an approved
diesel repair or inspection environment to ensure sufficient practical
exposure.
7. Which document is commonly required for Maryland diesel emissions
testing procedures?
A. Vehicle title
B. Insurance certificate
C. ASE certification card only
D. SAE J1667 test procedure
The SAE J1667 procedure standardizes diesel opacity testing methods
used during emissions inspections.
8. What is typically required for an individual to obtain CDER
authorization?
A. A criminal background in mechanics
B. Ownership of a repair shop
C. A commercial driver’s license only
D. Employer authorization and approved workplace equipment
Certification is tied to employment and requires employer support
along with proper testing equipment and documentation.
9. What is the minimum passing score commonly required on Maryland
emissions certification exams?
A. 70%
B. 75%
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. Which regulatory body primarily oversees diesel emissions-related
technician certification programs in Maryland?
A. Maryland Department of Transportation
B. Maryland Department of Labor
C. Maryland Department of the Environment (MDE)
D. Maryland Department of the Environment (MDE)
The Maryland Department of the Environment is responsible for
administering and enforcing diesel emissions control programs and
certifying personnel involved in emissions compliance activities.
2. What is the main purpose of Maryland’s diesel emissions certification
programs?
A. To increase fuel taxes
B. To train commercial drivers only
C. To regulate vehicle manufacturing standards
D. To ensure compliance with emissions and environmental
standards
, These programs exist to ensure diesel vehicles meet environmental
emissions requirements and to reduce pollution through certified
inspection and repair processes.
3. Which type of facility is typically required for diesel emissions retester
certification work?
A. Residential garage
B. Small retail shop
C. Enclosed testing area meeting state specifications
D. Enclosed diesel repair facility or authorized inspection station
Certification work must be conducted in properly equipped and
approved facilities capable of safely testing heavy-duty diesel
vehicles.
4. What is a key responsibility of a Certified Diesel Emissions Retester
(CDER)?
A. Selling diesel fuel
B. Issuing vehicle registration plates
C. Designing engine components
D. Certifying compliance after emissions-related repairs
CDERs verify that repaired diesel vehicles meet emissions standards
and properly document compliance after testing.
5. Which tool is commonly required for diesel emissions testing
procedures in Maryland?
A. Timing light
B. Compression tester
C. OBD-II scanner only
D. Smokemeter
A smokemeter is used to measure diesel exhaust opacity and
determine whether emissions meet regulatory limits.
, 6. What minimum working requirement is typically expected for CDER
applicants?
A. 10 hours per week
B. 20 hours per week
C. 25 hours per week
D. At least 30 hours per week in an eligible facility
Applicants must work a minimum number of hours in an approved
diesel repair or inspection environment to ensure sufficient practical
exposure.
7. Which document is commonly required for Maryland diesel emissions
testing procedures?
A. Vehicle title
B. Insurance certificate
C. ASE certification card only
D. SAE J1667 test procedure
The SAE J1667 procedure standardizes diesel opacity testing methods
used during emissions inspections.
8. What is typically required for an individual to obtain CDER
authorization?
A. A criminal background in mechanics
B. Ownership of a repair shop
C. A commercial driver’s license only
D. Employer authorization and approved workplace equipment
Certification is tied to employment and requires employer support
along with proper testing equipment and documentation.
9. What is the minimum passing score commonly required on Maryland
emissions certification exams?
A. 70%
B. 75%
