Examination Practice Questions And

Illinois Grader Operator Licensing Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a motor grader?

a) Excavating deep trenches

b) Leveling and grading surfaces

c) Lifting heavy loads

d) Compaction of soil

Rationale: A motor grader is designed primarily for creating flat

surfaces and fine grading.

• Before starting a grader, what is the first safety step?

a) Check the hydraulic fluid level

b) Start the engine immediately 1 / 4

c) Conduct a pre-operation inspection

d) Engage the blade

Rationale: Pre-operation inspection ensures the machine is safe to

operate and free from defects.

• Which blade position is best for cutting a slope?

a) Fully horizontal

b) Fully raised

c) Angled to match the slope

d) Fully lowered

Rationale: Angling the blade to the slope allows controlled cutting and

reduces strain on the grader.

• What is the main hazard when operating a grader on steep slopes?

a) Tire wear

b) Engine overheating

c) Risk of tipping over

d) Excessive fuel consumption

Rationale: Operating on slopes increases the risk of machine instability

and tipping.

• Which type of soil is easiest to grade with a motor grader?

a) Hard rock

b) Loose, granular soil

c) Wet clay

d) Frozen soil 2 / 4

Rationale: Loose soils are easier to manipulate and grade than dense

or cohesive soils.

• What does the articulation joint in a grader allow?

a) Engine cooling

b) Blade rotation

c) Steering flexibility

d) Hydraulic pressure regulation

Rationale: Articulation allows the front and rear sections to pivot for

tighter turns and better maneuverability.

• Which of the following increases grader efficiency?

a) Using full throttle at all times

b) Overloading the blade

c) Maintaining proper blade height and angle

d) Working in reverse constantly

Rationale: Correct blade height and angle reduce engine strain and

improve surface finish.

• How often should tire pressure be checked on a grader?

a) Once a month

b) Only when tires appear flat

c) Before each operation

d) Once a year

Rationale: Proper tire pressure is critical for safe operation, traction,

and even grading. 3 / 4

• What is a common sign of hydraulic system failure?

a) Engine noise

b) Tire vibration

c) Slow blade response or jerky movement

d) Steering wheel rotation

Rationale: The hydraulics control blade and articulation movement;

slow response indicates a hydraulic issue.

• When working near overhead power lines, what is the minimum

safe clearance for a grader?

• 5 feet
• 10 feet
• 10–20 feet depending on voltage
• 50 feet

Rationale: OSHA guidelines require maintaining safe distances to avoid

electrocution.

• What is the recommended method for shutting down a grader?

a) Stop suddenly and exit

b) Turn off the ignition while moving

c) Lower blade, set parking brake, then turn off engine

d) Leave blade up for next use

Rationale: Proper shutdown prevents accidental movement and

ensures safety.

• / 4