Free Red Seal Heavy Duty Equipment Technician Examination Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Red Seal Heavy Duty Equipment Technician Examination practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1A technician is lifting a heavy transmission with a properly rated, fully seated non-shoulder eye bolt. At what angle from vertical should the sling load this bolt?

   1. A.0 degreesCorrect answer: A
   2. B.30 degrees
   3. C.45 degrees
   4. D.60 degrees

   Explanation: CCOHS states: "Use plain or regular eye bolts (non-shoulder) or ring bolts for vertical loading only." A vertical pull is 0 degrees from vertical; the other angles apply a side load.

   Reference: Materials Handling - Lifting With Eye Bolts — What should be considered when selecting the right bolt?

2. 2While diagnosing a running four-stroke diesel engine, a technician considers a cylinder whose piston is moving upward with both intake and exhaust valves closed before the main fuel injection. Which stroke is occurring?

   1. A.Induction stroke
   2. B.Expansion stroke
   3. C.Compression strokeCorrect answer: C
   4. D.Exhaust stroke

   Explanation: The diesel engine description states: "The intake and exhaust valves are closed, and the piston moves from the bottom to the top, compressing air to create heat." During the exhaust stroke the exhaust valve is open; intake and power normally move the piston downward.

   Reference: How do diesel engines work? — How does a diesel engine work step-by-step? Compression stroke

3. 3During wheel-hub bearing inspection, a technician finds wear marks at rolling-element spacing on a raceway. The equipment had been stored for a long period while vibration caused small oscillations at the bearing contacts. Which damage mode best matches this history?

   1. A.Electrical erosion
   2. B.Particle indentation
   3. C.False brinellingCorrect answer: C
   4. D.Abrasive wear

   Explanation: SKF states that "False brinelling (ISO 5.3.3.3) (fig. 11) occurs in the contact area between the rolling elements and raceway subject to small oscillatory motion or vibration." It also reports that wear occurs at rolling-element spacing. Electrical erosion is associated with current passage, while particle indentation and abrasive wear involve contaminant-related mechanisms.

   Reference: Bearing damage analysis: ISO 15243 is here to help you — Corrosion, false brinelling

4. 4A connection in a machine's DC accessory circuit has 0.20 Ω of resistance, measured with power safely isolated. During a subsequent powered test, it carries 6.0 A. What voltage drop does Ohm's law predict across the connection at this current?

   1. A.0.12 V
   2. B.1.20 VCorrect answer: B
   3. C.12.0 V
   4. D.120 V

   Explanation: The electrical diagnostic guide gives "V = I × R". Thus 6.0 A × 0.20 Ω = 1.20 V. The alternatives arise by reading the current as 0.60 A (0.12 V), reading the resistance as 2.0 Ω (12.0 V), or reading the resistance as 20 Ω (120 V).

   Reference: Diagnosing Voltage Drops: Electrical Automotive Troubleshooting — Calculating Voltage Drop

5. 5A technician counts 41 teeth on a drive axle's ring gear and 10 teeth on its mating drive pinion. What is the ring-and-pinion reduction ratio, expressed to two decimal places?

   1. A.0.24:1
   2. B.3.73:1
   3. C.4.10:1Correct answer: C
   4. D.4.56:1

   Explanation: American Axle & Manufacturing instructs, "Divide the ring gear teeth number by the number of teeth on the pinion." The ratio is 41 ÷ 10 = 4.10:1. Reversing the operands gives 0.24:1; miscounting the pinion as 11 or 9 teeth gives 3.73:1 or 4.56:1, respectively, after rounding.

   Reference: To Determine Gear Ratio — Count the number of teeth

6. 6A technician explains the vapor-compression air-conditioning circuit of an equipment cab. In which component does refrigerant evaporate while absorbing heat from the air being cooled?

   1. A.Condenser
   2. B.EvaporatorCorrect answer: B
   3. C.Compressor
   4. D.Expansion valve

   Explanation: The refrigeration-cycle description says that refrigerant goes through the evaporator where it "evaporates, and results in absorbing heat from the inside of the refrigerator." The same vapor-compression principle applies to heat absorbed from air passing through a cab evaporator. The condenser rejects heat, the compressor raises pressure, and the expansion valve meters refrigerant.

   Reference: Analysis of Refrigeration Units in Off Grid PV/Wind Hybrid Systems on Tribal Land — PDF page 8, vapor compression refrigeration

7. 7In a closed-circuit hydrostatic drive, a technician is tracing the component that supplies make-up fluid to replace fluid lost through normal internal leakage. Which component performs that primary function?

   1. A.Drive motor
   2. B.Charge pumpCorrect answer: B
   3. C.Shuttle valve
   4. D.Drive pump

   Explanation: The hydrostatic transmission application manual states, "The primary function of the charge pump is to replenish fluid lost through leakage." It explains that the make-up fluid enters the low-pressure side of the closed circuit, keeping the loop full and helping prevent pump cavitation.

   Reference: Applications Manual: Selection of Driveline Components — Page 33, Charge Pump Sizing, Introduction

8. 8A technician identifies an operator-cab protective structure designed for the hazard of objects falling onto mobile equipment. Which abbreviation names that type of structure?

   1. A.ROPS
   2. B.FOPSCorrect answer: B
   3. C.TOPS
   4. D.OPS

   Explanation: The Canadian mobile-equipment reference identifies "falling object protective structures (FOPS)". ROPS and TOPS refer to rollover and tip-over protection, while OPS is the broader operator-protective-structure designation.

   Reference: Occupational Health and Safety Regulation, Part 16: Mobile Equipment — Section 16.33(2)(b)(i)(A)

9. 9A technician checks a hybrid machine equipped with electrical regenerative braking. During the energy-recovery portion of deceleration, which energy transfer is performed by the traction motor-generator?

   1. A.Wheel mechanical energy to battery electrical energyCorrect answer: A
   2. B.Battery electrical energy to wheel mechanical energy
   3. C.Engine mechanical energy to battery electrical energy
   4. D.Battery electrical energy to engine mechanical energy

   Explanation: The Department of Energy describes the generator as "Generates electricity from the rotating wheels while braking, transferring that energy back to the traction battery pack." The reverse wheel transfer propels the machine, while the engine transfers describe other operating modes.

   Reference: How Do Hybrid Electric Cars Work? — Key Components of a Hybrid Electric Car, Electric generator

10. 10A technician is comparing sling ratings while planning a lift. In the CCOHS eye-bolt guidance, what is the sling strength at a 45-degree horizontal angle as a percentage of its vertical sling capacity?

    1. A.30 percent
    2. B.71 percentCorrect answer: B
    3. C.75 percent
    4. D.100 percent

    Explanation: The guidance states: "Sling strength at 45° is 71% of vertical sling capacity." The 30% figure on the same page applies to the eye bolt, not the sling. The other percentages concern different configurations or ratings.

    Reference: Materials Handling - Lifting With Eye Bolts — How should you use eye bolts safely?