Equipment-system depth
Keep study tied to large equipment systems and real diagnostic reasoning.
Heavy Duty Equipment 421A
Heavy duty prep for hydraulics, diesel systems, powertrain, and inspection.
Practice the systems heavy duty technicians actually work through: hydraulics, diesel engines, electrical, brakes, powertrain, inspections, and troubleshooting.
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CODESAFE ACADEMYPRODUCT DEMOPracticeMock examsAnswer review
Electrical fundamentalsSample question
A 24 V circuit has 6 Ω resistance. What current flows?
A2 A
B4 A
C6 A
Understand the answer.Ohm’s law: I = V ÷ R. Divide 24 by 6 to get 4 amperes.
Illustrative demo · no saved progressTrade-specific practice
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Hydraulic confidence
Reinforce pumps, valves, actuators, pressure, flow, and troubleshooting patterns.
Applied review
Turn missed questions into clearer system understanding before the next attempt.
Connect the dots
Build your understanding, topic by topic.
Use focused practice to revisit the systems, skills and concepts in your trade. Bring what you learn into your next mock exam.
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Hydraulics
Diesel Engines
Electrical
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Inspection
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