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310T Exam Prep – Questions With Fully Explained
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- What procedure should be followed before using a bench grinder? a) Dress stone and set rest with minimum clearance of 3 mm (1/8"). b) Dress stone and set rest with maximum clearance of 1.6 mm (1/16"). c) Set rest with minimum clearance of 3 mm (1/8") and dress stone. d) Set rest with maximum clearance of 1.6 mm (1/16") and dress stone.
b) Dress stone and set rest with maximum clearance of 1.6 mm (1/16").
- What should be inspected on a chain sling before the technician uses it? a) Length and size. b) Bends and color. c) Elongation and twist. d) Date of manufacture and expiry date.
c) Elongation and twist.
- Where would a technician obtain information on a recurring problem? a) Shop foreman. b) The service manual. c) The operators manual. d) Technical service bulletins.
d) Technical service bulletins
- What is the proper procedure to clean up a coolant spill? a) Cover with floor dry. b) Wash into floor drain. c) Contain with a floor dam. d) Refer to MSDS information.
d) Refer to MSDS information
- Where is the data link located on a highway tractor? a) Left side of glove box. b) In the fuse panel. c) Beside the Electronic Control Unit. d) Left lower dash panel.
d) Left lower dash panel.
- What steps should be followed when utilizing Torque-to-Yield fasteners? a) Lubricate threads and torque to specifications. b) Rotate to specified degrees and torque to specifications. c) Torque to specifications and rotate to specified degrees. d) Tighten a specified number of degrees with an impact.
c) Torque to specifications and rotate to specified degrees
- What type of hose or tubing should be used on the compressor air outlet? a) Nylon tubing. b) Stainless steel tubing. c) Reinforced rubber air brake hose. d) Braided stainless steel with a Teflon inner lining.
d) Braided stainless steel with a Teflon inner lining
- What type of seal would be considered as a static seal? a) Oil filter seal. b) Rear wheel seal. c) Rear crankshaft seal. d) Transmission output shaft seal.
a) Oil filter seal.
- What would indicate that the engine oil pump regulating valve is stuck open? a) Increased oil pressure. b) Decreased oil pressure. c) Increased oil consumption. d) Decreased oil consumption.
b) Decreased oil pressure
- What will cause a diesel engine to run rough and stall? a) Poor fuel quality. b) A plugged return line. c) Air in the fuel system. d) Low transfer pump pressure.
c) Air in the fuel system.
- What is the cause of low fuel transfer pump pressure? a) Plugged fuel filter. b) Return line restriction. c) Leaking fuel tank vent. d) Regulating valve stuck closed.
a) Plugged fuel filter
- Which will cause a diesel engine to have low power output? a) Cracked intercooler. b) Excessive turbocharger speed. c) Leaking turbocharger exhaust outlet. d) Turbocharger waste-gate valve stuck closed.
a) Cracked intercooler.
- What must be used on an engine equipped with a diesel particulate filter (DPF)? a) Fuel lubricity additive. b) Low sulphur Diesel fuel. c) 5% Bio-Diesel/Ethanol blend. d) Ultra low sulphur diesel fuel.
d) Ultra low sulphur diesel fuel
- What will happen when the soot loading on a diesel particulate filter (DPF) exceeds 80%? a) Reduced fuel economy. b) A forced manual regeneration. c) Engine de-rate and shutdown. d) The DPF will bypass automatically.
c) Engine de-rate and shutdown
- What exhaust smoke color would indicate a leaking "Dosing" valve? a) Blue. b) Black. c) White. d) Brown.
b) Black
- What does the second number in a SAE fault code (e.g. 100 - 4) indicate? a) Type of circuit failure. b) Type of sensor circuit. c) Message identification. d) Number of fault occurrences.
a) Type of circuit failure
- What would happen to the engine if the ECM does not receive a speed/timing signal? a) Exceed governed speed. b) Hunt at governed speed. c) Start and run at idle speed. d) Cranks but does not start.
d) Cranks but does not start
- What should be done before removing an injection nozzle for testing or repair? a) Check the injection pump timing. b) Change the primary fuel filter. c) Clean the area around the injector thoroughly. d) Bend the injection line slightly for clearance.
c) Clean the area around the injector thoroughly
- How is an intake manifold pressure test performed on a turbocharged engine? a) Install a gauge at the turbine housing outlet and load the engine. b) Install a gauge at the compressor housing outlet and load the engine. c) Install a gauge at the compressor housing inlet and load the engine. d) Install a gauge at the compressor housing outlet and run the engine at high idle.
b) Install a gauge at the compressor housing outlet and load the engine.
- What is the correct service procedure when the DPF warning light is flashing? a) Remove DPF for cleaning. b) Refill the Urea reservoir. c) Perform a manual regeneration. d) Run the engine at high idle.
c) Perform a manual regeneration
- When servicing the SCR system what is a necessary step? a) Wear PPE to avoid electrical shock. b) Wear PPE for protection from high temperatures. c) Prevent skin and eye contact with the DEF (Urea). d) Remove loose clothing to prevent contact with the DEF (Urea).
c) Prevent skin and eye contact with the DEF (Urea)
- What precaution must be taken before welding on a vehicle with electronic engine controls? a) Record all fault codes. b) Attach the welder's ground clamp to the ECM. c) Attach the welding connections using reverse polarity. d) Disconnect the ECM from the vehicles power supply.
d) Disconnect the ECM from the vehicles power supply.
- What is done before replacing a common rail fuel injector? a) Release residual pressure in the fuel pump supply circuit. b) Release the residual pressure in the accumulator (high pressure rail). c) Purge the accumulator (high pressure rail) to prevent fuel oil dilution. d) Replace the fuel filters to prevent contamination of the new injector.
a) Release residual pressure in the fuel pump supply circuit.
- What will cause air to leak out of the relay valve with the park brake released and the service brake not applied? a) Ruptured service brake diaphragm. b) Ruptured Park/Emergency brake diaphragm. c) Faulty secondary reservoir blow-off valve. d) Parking/Emergency brake chamber pushrod seal leak.
d) Parking/Emergency brake chamber pushrod seal leak
- What would be indicated if the ABS dash light goes out after 6 km/h? a) A faulty ECU. b) A faulty wheel speed sensor. c) No systems faults are present. d) Faulty brake modulator valve.
c) No systems faults are present.
- What will cause an air brake to "cam over" during application? a) Worn cam bushings. b) Worn drums and shoes. c) Slack adjuster set too tight. d) Excessive application pressure.
b) Worn drums and shoes.
- What will cause an engine braking system to operate only in the first and third stage? a) Faulty dash switch. b) Faulty brake switch. c) Faulty clutch switch. d) Faulty throttle switch.
a) Faulty dash switch.
- What would be indicated if one engine brake head continues to operate after the brake switch is turned off? a) Faulty clutch switch. b) Solenoid valve stuck closed. c) Broken master piston spring. d) Broken hydraulic control valve springs.
d) Broken hydraulic control valve springs
- What would happen if an exhaust brake failed to open after application? a) Engine would stall. b) Ruptured exhaust tubing. c) Turbocharger over-speed. d) Elevated exhaust temperature.
d) Elevated exhaust temperature
- What will cause poor engine braking power? a) Insufficient slave piston lash. b) Excessive master piston lash. c) Excessive engine oil pressure. d) Faulty throttle position sensor.
a) Insufficient slave piston lash
- What must be done daily with an air brake equipped unit? a) Drain air tanks. b) Adjust the brakes. c) Pressure test the compressor. d) Rotate the slack adjusters.
a) Drain air tanks.
- What is the procedure for checking governor operation? a) Check manufacture specifications then fan the brakes. b) Remove governor from compressor and check governor spring tension. c) Reduce air and record compressor cut in, build pressure and record cut out. d) Fan the brakes until cut in pressure is achieved then check compressor run time.
c) Reduce air and record compressor cut in, build pressure and record cut out.
- What is done when replacing the double check valve between the primary and secondary air tanks? a) Drain air system and replace valve. b) Apply park brake and replace valve. c) Clean around valve and replace valve. d) Remove primary tank and then replace valve.
a) Drain air system and replace valve.
- What must be done when replacing S-cams on an air brake equipped vehicle? a) Replace the automatic slack adjusters. b) Ensure that S-cams have the correct rotation designation. c) Inspect or replace the service brake chamber diaphragms. d) Turn the S-cam bushings 180º to promote even wear.
b) Ensure that S-cams have the correct rotation designation.
- Which of the following describes a function of an engine compression brake? a) Closes the intake valve on the power stroke. b) Closes the exhaust valve on the power stroke. c) Opens the intake valve on the compression stroke. d) Opens the exhaust valve on the compression stroke.
d) Opens the exhaust valve on the compression stroke
- What do you do prior to setting the slave valve clearance of an engine compression brake? a) Position the piston of the cylinder to be adjusted at TDC. b) Ensure that the intake valves are fully closed on the cylinder to be adjusted. c) Ensure that the exhaust valves are fully closed on the cylinder to be adjusted. d) Cycle the solenoid valve to purge all the oil out of the engine brake housing.
c) Ensure that the exhaust valves are fully closed on the cylinder to be adjusted.
- How should a clutch switch be adjusted? a) So that the switch is opened when the clutch brake is engaged. b) So that the switch is closed when the brake pedal is depressed. c) So that the switch is closed when the clutch pedal is depressed. d) So that the switch is opened when the clutch pedal is depressed.
d) So that the switch is opened when the clutch pedal is depressed
- What should be done after installing an exhaust brake? a) Adjust the intake and exhaust valves. b) Measure the exhaust system temperature. c) Measure exhaust backpressure before the brake housing. d) Measure exhaust backpressure after the brake housing.
c) Measure exhaust backpressure before the brake housing
- What would cause a battery to continuously show signs of moisture near the vent caps? a) Overfilling of the cells. b) Voltage regulator set too high. c) Open stator winding in the alternator. d) Dirty connections at the battery terminals.
b) Voltage regulator set too high
- What is indicated if the battery terminal voltage drops below 9.6 volts during cranking? a) Battery low state of charge. b) Starter has low internal resistance. c) The starter has a loose ground connection. d) Battery cables have excessive voltage drop.
a) Battery low state of charge.
- What would cause repeated cycling of a circuit breaker? a) Low current flow. b) High system voltage. c) Short circuit to ground. d) Corroded ground connection.
c) Short circuit to ground
- Using an ohmmeter, what test results would indicate an inoperable block heater? a) Continuity between both heater terminals. b) Infinite resistance between both heater terminals. c) No continuity between either heater terminal and ground. d) Infinite resistance between either heater terminal and ground.
b) Infinite resistance between both heater terminals
- What is indicated if system voltage is present across the terminals of a toggle switch in the "on position"? a) Circuit is open. b) Normal condition. c) Switch contacts are open. d) Switch contacts are shorted.
b) Normal condition
- What should be done before performing a battery load test? a) Charge the battery for 15 seconds. b) Discharge the battery for 30 seconds. c) Determine the batteries state of charge. d) Check the condition of the battery cables.
c) Determine the batteries state of charge.
- What is the procedure for checking charging system regulated voltage? a) Use a carbon pile to control alternator output. b) Measure system voltage with engine at 1000 rpm. c) Turn on all electrical loads and run engine at 1000 rpm. d) Measure system voltage while alternator output is below 1/3.
d) Measure system voltage while alternator output is below 1/
- What is done to test for voltage drops in the cranking motor circuit? a) Check and clean all connections. b) Measure starter cable resistance with an ohmmeter. c) Check voltage across the cables while the engine is running. d) Compare battery voltage to starter terminal voltage while cranking the engine.
d) Compare battery voltage to starter terminal voltage while cranking the engine
- What would cause an accidental deployment of the SRS system? a) Boosting batteries. b) Fast charging batteries. c) Electrostatic discharge. d) Load testing the batteries.
c) Electrostatic discharge
- What is indicated by a weak signal from a reluctance type speed sensor? a) Sensor coil is open. b) Sensor coil is shorted. c) Air gap is less than specified. d) Loose sensor ground connection.
b) Sensor coil is shorted
- What should be done to diagnose a system malfunction when no fault codes have been generated? a) Replace the batteries. b) Replace the ECU module. c) Reprogram the ECU module. d) Perform symptom based tests.
d) Perform symptom based tests
- What would be indicated when an ohmmeter connected across the J backbone reads higher than normal resistance? a) One terminating resistor is open. b) High resistance in the CAN stubs. c) One terminating resistor is shorted. d) A short in the backbone wiring harness.
a) One terminating resistor is open
- What would cause a network error message indicating one module is offline? a) Open network harness fuse. b) Open backbone wiring harness. c) Excessive network signal traffic. d) High resistance module power connection.
d) High resistance module power connection
- What should be done before installing spark plugs? a) Measure the reach. b) Check the heat range. c) Adjust the electrode gap. d) Torque to specifications.
c) Adjust the electrode gap.
- What must be connected when working with electronic circuits? a) A test harness. b) A surge protector. c) A static ground strap. d) A module housing ground.
c) A static ground strap
- What is the procedure for adjusting speed sensor air gap on the output shaft of a transmission? a) Bottom the sensor lightly on a tone ring tooth, back out 1/4 - 1/2 turn. b) Turn the sensor towards the tone ring teeth to achieve running clearance. c) Turn the sensor in until there is a light drag on a 0.4 mm (0.016") feeler gauge. d) Bottom out the sensor and back off 1/4 turn while rotating the driveshaft by hand.
a) Bottom the sensor lightly on a tone ring tooth, back out 1/4 - 1/2 turn.
