Manitoba Heavy Duty Equipment Technician
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a torque converter in heavy
equipment?
A. To reduce engine speed
B. To multiply torque and allow slippage between engine and
transmission
C. To engage mechanical gears
D. To cool transmission fluid
The torque converter transfers and multiplies engine torque while
allowing smooth power delivery.
2. What condition is most likely if hydraulic oil appears milky?
A. Overheating
B. Oxidation
C. Water contamination
D. Excessive pressure
Milky oil indicates emulsified water in the hydraulic system.
3. Which component regulates maximum system pressure in a
hydraulic circuit?
A. Flow control valve
B. Directional control valve
C. Pressure relief valve
, D. Check valve
Relief valves protect the system by limiting maximum pressure.
4. Excessive exhaust black smoke usually indicates:
A. Lean fuel mixture
B. Coolant contamination
C. Over-fueling or restricted air intake
D. Incorrect injection timing (advanced)
Black smoke is caused by incomplete combustion from excess fuel
or lack of air.
5. What is the function of an aftercooler?
A. Reduce exhaust temperature
B. Lower intake air temperature to increase air density
C. Heat engine coolant
D. Filter intake air
Cooler intake air improves combustion efficiency and power.
6. Which tool is used to measure cylinder bore wear?
A. Feeler gauge
B. Micrometer
C. Dial bore gauge
D. Vernier caliper
Dial bore gauges accurately measure internal diameters.
7. What causes hydraulic cavitation?
A. Excessive oil temperature
B. High return pressure
C. Insufficient oil supply to the pump
D. Incorrect oil viscosity (too thick)
, Cavitation occurs when vapor bubbles form due to low inlet
pressure.
8. Which type of bearing supports radial loads only?
A. Thrust bearing
B. Journal (plain) bearing
C. Tapered roller bearing
D. Angular contact bearing
Journal bearings are designed mainly for radial loads.
9. A weak battery condition can be caused by:
A. High electrolyte level
B. Parasitic electrical draw
C. Clean terminals
D. Proper charging rate
Parasitic draws discharge batteries when equipment is off.
10. What is the primary purpose of differential lock?
A. Increase engine power
B. Reduce tire wear
C. Provide equal power to both drive wheels
D. Improve fuel economy
Differential locks improve traction in low-grip conditions.
11. Which sensor monitors exhaust emissions in modern diesel
engines?
A. MAP sensor
B. NOx sensor
C. Coolant temperature sensor
D. Oil pressure sensor
Certification Exam Questions And Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. What is the primary purpose of a torque converter in heavy
equipment?
A. To reduce engine speed
B. To multiply torque and allow slippage between engine and
transmission
C. To engage mechanical gears
D. To cool transmission fluid
The torque converter transfers and multiplies engine torque while
allowing smooth power delivery.
2. What condition is most likely if hydraulic oil appears milky?
A. Overheating
B. Oxidation
C. Water contamination
D. Excessive pressure
Milky oil indicates emulsified water in the hydraulic system.
3. Which component regulates maximum system pressure in a
hydraulic circuit?
A. Flow control valve
B. Directional control valve
C. Pressure relief valve
, D. Check valve
Relief valves protect the system by limiting maximum pressure.
4. Excessive exhaust black smoke usually indicates:
A. Lean fuel mixture
B. Coolant contamination
C. Over-fueling or restricted air intake
D. Incorrect injection timing (advanced)
Black smoke is caused by incomplete combustion from excess fuel
or lack of air.
5. What is the function of an aftercooler?
A. Reduce exhaust temperature
B. Lower intake air temperature to increase air density
C. Heat engine coolant
D. Filter intake air
Cooler intake air improves combustion efficiency and power.
6. Which tool is used to measure cylinder bore wear?
A. Feeler gauge
B. Micrometer
C. Dial bore gauge
D. Vernier caliper
Dial bore gauges accurately measure internal diameters.
7. What causes hydraulic cavitation?
A. Excessive oil temperature
B. High return pressure
C. Insufficient oil supply to the pump
D. Incorrect oil viscosity (too thick)
, Cavitation occurs when vapor bubbles form due to low inlet
pressure.
8. Which type of bearing supports radial loads only?
A. Thrust bearing
B. Journal (plain) bearing
C. Tapered roller bearing
D. Angular contact bearing
Journal bearings are designed mainly for radial loads.
9. A weak battery condition can be caused by:
A. High electrolyte level
B. Parasitic electrical draw
C. Clean terminals
D. Proper charging rate
Parasitic draws discharge batteries when equipment is off.
10. What is the primary purpose of differential lock?
A. Increase engine power
B. Reduce tire wear
C. Provide equal power to both drive wheels
D. Improve fuel economy
Differential locks improve traction in low-grip conditions.
11. Which sensor monitors exhaust emissions in modern diesel
engines?
A. MAP sensor
B. NOx sensor
C. Coolant temperature sensor
D. Oil pressure sensor
