CDL Hazmat Vehicle Inspection and Safety
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Questions and Answers

How often should dual tires be inspected while transporting hazardous materials?

  • 3 hours or 150 miles
  • 2 hours or 100 miles (correct)
  • 4 hours or 200 miles
  • 1 hour or 50 miles

    • Which sensor is used to assess engine temperature?

  • Air Temperature sensor
  • Throttle position sensor
  • Coolant sensor (correct)
  • Manifold absolute pressure sensor

    • What is the most effective and secure technique for descending a steep slope?

  • Changing to a lower gear (correct)
  • Changing to neutral and coasting down hill
  • Changing to a higher gear
  • Remaining in the same gear

    • What is the electrolyte of a battery a combination of?

    <p>Water and Sulfuric acid</p> Signup and view all the answers

    How would delayed valve timing due to a stretched timing belt affect a single overhead camshaft engine?

    <p>Low RPM power will be reduced</p> Signup and view all the answers

    How should the integrity of an electrical connection be tested?

    <p>For tightness, then a voltage drop should be performed across the connector</p> Signup and view all the answers

    When measuring an unknown voltage or current, what range selection should be set?

    <p>The point midway between the lowest and the highest range</p> Signup and view all the answers

    Which spring suspension system is used above the main leaf spring assembly and only under severe loads?

    <p>Auxiliary spring suspension</p> Signup and view all the answers

    What is the correct procedure when changing the coil assembly in a Supplemental Inflatable Restraint steering column?

    <p>Lock the steering column, and disable the airbag</p> Signup and view all the answers

    Which tool is used to measure coolant freeze protection?

    <p>Hydrometer</p> Signup and view all the answers

    What does a specific gravity of 1.225 at 80°F indicate about a battery's state of charge?

    <p>The battery is approximately 75% charged</p> Signup and view all the answers

    Can a hydrometer be used to check battery state of charge on a maintenance-free battery?

    <p>No, it is not possible</p> Signup and view all the answers

    What is the purpose of an auxiliary spring suspension?

    <p>To provide additional support under heavy loads</p> Signup and view all the answers

    What is the most likely cause of a tire vibrating at 40 to 60 kilometres per hour?

    <p>Weak shock absorbers</p> Signup and view all the answers

    What would happen to the reading on a pressure gauge if a gas is cooled?

    <p>It would decrease</p> Signup and view all the answers

    When towing multiple trailers, which trailer should be closest to the tractor?

    <p>Heaviest trailer</p> Signup and view all the answers

    What is the most likely cause of a compressor clutch that will not engage despite having good power and ground at the clutch coil?

    <p>Incorrect air gap</p> Signup and view all the answers

    What test should be performed if the charging system's output is below the rated output?

    <p>Alternator output (full-field test)</p> Signup and view all the answers

    How many seconds of gap should be maintained while driving a 100-foot tandem trailer combo at 50 miles per hour on a dry road with adequate visibility?

    <p>11</p> Signup and view all the answers

    What is the most likely cause of blue exhaust smoke?

    <p>Worn valve guides</p> Signup and view all the answers

    How is a shuddering situation repaired during torque converter lock up?

    <p>By replacing the torque converter</p> Signup and view all the answers

    What is evaluated during a road test to certify that a diesel engine has low power?

    <p>Boost and fuel pressures</p> Signup and view all the answers

    What would result in a low amperage draw and a sluggish cranking speed?

    <p>High starter cable resistance</p> Signup and view all the answers

    What is likely to cause the failure of the conveyer bearings on a paver?

    <p>Lack of grease</p> Signup and view all the answers

    What is the most likely cause of an engine noise that sounds like a knock at the side of the engine, louder when cold and reduced when the engine reaches operating temperature?

    <p>Piston slap</p> Signup and view all the answers

    What is the protocol for evaluating or fixing seat belt systems after a collision?

    <p>Inspect belt and buckle operation, then inspect the stitching at the energy management loops</p> Signup and view all the answers

    What is the likely cause of white smoke emitting from the exhaust when the engine is under stress?

    <p>Coolant loss</p> Signup and view all the answers

    What power is required to keep 250 pounds of block and tackle with five rope falls and little friction?

    <p>50 lbs</p> Signup and view all the answers

    Why is it necessary to remove the ring ridge before removing the piston/rod assembly?

    <p>To prevent damage to the piston ring lands</p> Signup and view all the answers

    What is the correct procedure when changing a clutch?

    <p>Check bell housing alignment before installing clutch assembly</p> Signup and view all the answers

    What is the likely cause if a warning bulb does not illuminate, but does when the cable connecting the lamp to the transmitting device is grounded?

    <p>Sending unit is defective</p> Signup and view all the answers

    What is the most likely cause if the starting armature spins, but the engine does not start?

    <p>Starter drive overrunning clutch slippage</p> Signup and view all the answers

    At what pressure does a warning provide before air pressure in the air tank falls?

    <p>60psi</p> Signup and view all the answers

    What is the primary purpose of idling the engine prior to shutting it off?

    <p>Cool the engine oil</p> Signup and view all the answers

    What is the benefit of checking bell housing alignment before installing a new clutch?

    <p>To prevent damage to the clutch assembly</p> Signup and view all the answers

    What is evaluated during a road test to certify that a diesel engine has low power?

    <p>Fuel temperature and exhaust back pressure</p> Signup and view all the answers

    What would result in a low amperage draw and a sluggish cranking speed?

    <p>High starter cable resistance</p> Signup and view all the answers

    What is likely to cause the failure of the conveyer bearings on a paver?

    <p>Lack of grease</p> Signup and view all the answers

    What is the most likely cause of an engine noise that sounds like a knock at the side of the engine, louder when cold and reduced when the engine reaches operating temperature?

    <p>Piston slap</p> Signup and view all the answers

    What is the protocol for evaluating or fixing seat belt systems after a collision?

    <p>Inspect belt and buckle operation, then inspect the stitching at the energy management loops</p> Signup and view all the answers

    What is the likely cause of white smoke emitting from the exhaust when the engine is under stress?

    <p>Coolant loss</p> Signup and view all the answers

    Why is it important to check the refrigerant oil level?

    <p>To ensure proper lubrication</p> Signup and view all the answers

    What is the suggested cause if vacuum falls to 8 inches Hg and then recovers to 18 inches Hg during a snap throttle test?

    <p>Restricted exhaust system</p> Signup and view all the answers

    What is correct when fixing automatic transmissions?

    <p>Clutch packs may be pressure tested using low pressure air.</p> Signup and view all the answers

    What must be done prior to disassembling a parking brake with a spring?

    <p>cage the spring</p> Signup and view all the answers

    What is likely to cause a vehicle equipped with a short arm long arm suspension to wander?

    <p>Both a and b</p> Signup and view all the answers

    What must be connected before backing beneath a tractor-trailer?

    <p>The air brake system</p> Signup and view all the answers

    What is the suggested cause if vacuum falls to 8 inches Hg and then recovers to 18 inches Hg during a snap throttle test?

    <p>Restricted exhaust system</p> Signup and view all the answers

    What is the most likely cause of a bent connecting rod?

    <p>Hydrostatic lock</p> Signup and view all the answers

    Which operating circumstance would cause the housing of a gear pump to break or the pump shaft to detach?

    <p>Over pressure operation</p> Signup and view all the answers

    How can you perform an emergency stop using the stab braking technique with air brakes?

    <p>d) Brake as hard as you can, get off the brakes when the wheels lock, get back on the brakes when the wheels start rolling again</p> Signup and view all the answers

    What is the purpose of twin parking control valves if your vehicle is equipped with them?

    <p>To stay parked without using up service air pressure</p> Signup and view all the answers

    How should you check the slack adjuster?

    <p>Park on level ground, turn off parking brakes, pull hard on each slack adjuster</p> Signup and view all the answers

    What is the most likely cause of a gear pump failure?

    <p>Operation with a high pump inlet restriction</p> Signup and view all the answers

    How can you prevent a gear pump from breaking or the pump shaft from detaching?

    <p>Ensure the pump inlet restriction is within acceptable limits</p> Signup and view all the answers

    What is the correct procedure for checking the parking brake system?

    <p>Park on level ground, turn off parking brakes, pull hard on each slack adjuster</p> Signup and view all the answers

    What action should be taken to prevent deployment of the air bag?

    <p>Disconnect the multi-function switch</p> Signup and view all the answers

    What should be done if the yellow check engine light is illuminated?

    <p>Test all circuits related to the fault</p> Signup and view all the answers

    What will happen if the spark plug wires are not installed in the correct order?

    <p>Engine will misfire upon starting</p> Signup and view all the answers

    What is the abbreviation for RAM?

    <p>Random access memory</p> Signup and view all the answers

    In an acetylene cylinder, what is acetylene stabilised by?

    <p>Acetone</p> Signup and view all the answers

    What is the basis for closed loop functioning in a fuel injection system?

    <p>Oxygen content of exhaust gases</p> Signup and view all the answers

    What is the correct cost of fuel needed to travel 620km to the nearest dollar?

    <p>$106</p> Signup and view all the answers

    What is a huge single panel, frame, or assemblage of panels on which switches, over current and other protection devices, buses, and often instruments are placed?

    <p>Control panel</p> Signup and view all the answers

    Which component must be driven by a battery box to increase pressure?

    <p>Servo valve</p> Signup and view all the answers

    What is the correct procedure when replacing seat anchor bolts?

    <p>Remove thread sealer from threads and install new bolts with an impact wrench</p> Signup and view all the answers

    Which component links to the engine's exhaust manifold to be activated?

    <p>Turbocharger</p> Signup and view all the answers

    What is the concluding step when installing a torque converter on a transmission?

    <p>Torque the drive/flex plate retaining bolts</p> Signup and view all the answers

    What customer concern could be caused by a defective ECT return spring malfunction?

    <p>Rough idle</p> Signup and view all the answers

    What type of truck spring suspension system is installed above the primary leaf spring assembly?

    <p>Air spring suspension</p> Signup and view all the answers

    What is the purpose of the Temposonic transducer?

    <p>To increase pressure drive the servo valve</p> Signup and view all the answers

    What is the correct procedure when testing the Electronic Controlled Throttle circuit?

    <p>Use a lap-top computer and manufacturer software</p> Signup and view all the answers

    What is evaluated during a road test to certify that a diesel engine has low power?

    <p>Fuel temperature and exhaust back pressure</p> Signup and view all the answers

    What would result in a low amperage draw and a sluggish cranking speed?

    <p>Overcharged battery</p> Signup and view all the answers

    What is likely to cause the failure of the conveyer bearings on a paver?

    <p>Lack of tension</p> Signup and view all the answers

    What is the most likely cause of an engine noise that sounds like a knock at the side of the engine, louder when cold and reduced when the engine reaches operating temperature?

    <p>Piston slap</p> Signup and view all the answers

    What is the protocol for evaluating or fixing seat belt systems after a collision?

    <p>Inspect belt and buckle operation, then inspect the stitching at the energy management loops</p> Signup and view all the answers

    What is the likely cause of white smoke emitting from the exhaust when the engine is under stress?

    <p>Coolant leak</p> Signup and view all the answers

    Why is it important to check the refrigerant oil level?

    <p>To ensure proper lubrication</p> Signup and view all the answers

    What would cause a coolant loss?

    <p>Recently, coolant was supplied to a heated engine</p> Signup and view all the answers

    What is the correct sequence of oil circulation in an engine?

    <p>sump to oil pump to bearings to filter</p> Signup and view all the answers

    What is the correct procedure when inflating a wheel and tire assembly?

    <p>Cage or confine the wheel and tire assembly and use a remote fill / deflate device</p> Signup and view all the answers

    Before opening a connection in the sensor harness of an electronic control system, what must be done?

    <p>Ensure the key switch is turned off</p> Signup and view all the answers

    What would cause a HEUI fuel system to be difficult or impossible to start?

    <p>Leaking injector oil return</p> Signup and view all the answers

    What would cause a hydrostatic drive system to function in backward but not forward?

    <p>Servo pistons are scored</p> Signup and view all the answers

    What is the first step to take when a linear positioner circuit malfunctions?

    <p>Consult the repair manual</p> Signup and view all the answers

    What measures must be followed when inflating a wheel and tire assembly comprised of many components?

    <p>Cage or confine the wheel and tire assembly and use a remote fill / deflate device</p> Signup and view all the answers

    What would cause a hydrostatic drive system to function in reverse but not forward?

    <p>Servo pistons are scored</p> Signup and view all the answers

    What should be done if the lubricant level in the differential, steering reservoir, or gearbox is very low?

    <p>Fill to proper level with specified lubricant.</p> Signup and view all the answers

    What is the correct approach for measuring main bearing clearance using plastigaged?

    <p>Install plastigage, lubricate journal, torque bearing cap, read clearance.</p> Signup and view all the answers

    Which of the following is the ratio of the primary winding to the secondary of an electric transformer that has 240 turns, and the secondary winding has 15 turns?

    <p>240/15</p> Signup and view all the answers

    Which of the following is the maximum allowable temperature for a sealed bearing?

    <p>180ºF</p> Signup and view all the answers

    Which object should never be transported with passengers on a bus?

    <p>Tear gas</p> Signup and view all the answers

    Which technician is correct?

    <p>Technician 2</p> Signup and view all the answers

    What should be done if the lubricant level in the differential, steering reservoir, or gearbox is very low and cannot be corrected?

    <p>Recommend the owner return it later for service.</p> Signup and view all the answers

    What is the primary concern when transporting certain objects?

    <p>Safety of the passengers</p> Signup and view all the answers

    If all warning gauges in the instrument cluster read high, what is the likely cause?

    <p>A shorted ground</p> Signup and view all the answers

    What should be installed next when rebuilding a dual countershaft transmission?

    <p>The high/low range synchronizer</p> Signup and view all the answers

    What is the correct adjustment sequence for a power steering box?

    <p>Adjust poppets, sector shaft endplay, and input shaft preload</p> Signup and view all the answers

    What is the typical voltage range of a quality oxygen sensor?

    <p>0.450 volts to 1.000 volts</p> Signup and view all the answers

    What is the configuration of a 12-volt car battery?

    <p>Six cells connected in series</p> Signup and view all the answers

    During an air conditioning performance test, what does a hot compressor outlet indicate?

    <p>This is a normal condition</p> Signup and view all the answers

    What is the effect of a shorted ground on the instrument cluster?

    <p>All warning gauges read high</p> Signup and view all the answers

    What is the significance of low resistance in a balancing coil gauge?

    <p>The sending unit has low resistance</p> Signup and view all the answers

    What should be done to prevent deployment of the air bag?

    <p>Disconnect the multi-function switch</p> Signup and view all the answers

    What will occur if the spark plug wires are not installed in the correct order?

    <p>Engine will misfire upon starting</p> Signup and view all the answers

    What is the abbreviation for RAM?

    <p>Random access memory</p> Signup and view all the answers

    In an acetylene cylinder, acetylene is stabilised by which of the following?

    <p>Ferond acetone water</p> Signup and view all the answers

    What is the basis for closed loop functioning in a fuel injection system?

    <p>All of the above</p> Signup and view all the answers

    What will be the cost of fuel needed to travel 620km to the nearest dollar?

    <p>$106</p> Signup and view all the answers

    What is a huge single panel, frame, or assemblage of panels on which switches, over current and other protection devices, buses, and often instruments are placed on the face, back, or both?

    <p>Panelboard</p> Signup and view all the answers

    If the yellow check engine light is illuminated, what should be done?

    <p>Test all circuits related to the fault</p> Signup and view all the answers

    What would happen to the power of a single overhead camshaft engine if the valve timing is delayed due to a stretched timing belt?

    <p>High RPM power will be reduced</p> Signup and view all the answers

    How should an electrical connection be tested for integrity?

    <p>For tightness, then a voltage drop should be performed</p> Signup and view all the answers

    What is the composition of a battery's electrolyte?

    <p>Sulfuric acid and water</p> Signup and view all the answers

    What is the best technique for descending a steep slope?

    <p>Changing to a lower gear</p> Signup and view all the answers

    What would happen if the refrigerant oil level is not checked regularly?

    <p>The system will experience reduced performance</p> Signup and view all the answers

    What is the primary concern when transporting hazardous materials?

    <p>Public safety</p> Signup and view all the answers

    What is the purpose of a coolant sensor in a vehicle?

    <p>To monitor engine temperature</p> Signup and view all the answers

    What is the most likely cause of a tire vibrating at 40 to 60 kilometres per hour?

    <p>Unbalanced tires</p> Signup and view all the answers

    What is the consequence of a tractor protection valve closing when the trailer breaks away from a combination vehicle?

    <p>The trailer brakes will activate and the air lines will separate.</p> Signup and view all the answers

    What is the correct procedure to check the continuity of wires that carry digital signals?

    <p>Use a logic probe.</p> Signup and view all the answers

    What type of fuel systems are used for engines with spark ignition?

    <p>Carburetor and fuel injection.</p> Signup and view all the answers

    What is the primary source of power for most electrical gauges?

    <p>Battery regulated voltage.</p> Signup and view all the answers

    What is the first step in removing refrigerant from an air conditioning system?

    <p>Identify the type of refrigerant.</p> Signup and view all the answers

    How much torque is transmitted to the driving pinion of the front axle of a four-wheel-drive car in low range?

    <p>162 pounds.</p> Signup and view all the answers

    What is the most fuel-efficient braking method?

    <p>Engine braking.</p> Signup and view all the answers

    What should be checked before backing behind a trailer?

    <p>All of the above.</p> Signup and view all the answers

    What should you do when driving a double trailer and need to prevent a collision?

    <p>Use controlled or stab braking</p> Signup and view all the answers

    What is a common lubricant for cylinder head bolts?

    <p>No seize compound</p> Signup and view all the answers

    What is a benefit of endurance braking systems?

    <p>Reduced brake wear on long hills</p> Signup and view all the answers

    What is a likely cause if a fuel gauge reads full?

    <p>Wire to sending unit grounded</p> Signup and view all the answers

    What can cause a hydrostatic axial piston drive motor to fail?

    <p>Restricted inlet line or filters</p> Signup and view all the answers

    What is a method to reduce fuel consumption?

    <p>Using lower gears</p> Signup and view all the answers

    What are slack adjusters?

    <p>An adjusting nut on the backside of the brake drum</p> Signup and view all the answers

    What can produce vibration in the driveline?

    <p>All of the above</p> Signup and view all the answers

    During a road test, what is evaluated to certify that a diesel engine has low power?

    <p>Fuel temperature and exhaust back pressure</p> Signup and view all the answers

    What would result in a low amperage draw and a sluggish cranking speed?

    <p>High starter cable resistance</p> Signup and view all the answers

    What is likely to cause the failure of the conveyer bearings on a paver?

    <p>Lack of tension</p> Signup and view all the answers

    What is the most likely cause of an engine noise that sounds like a knock at the side of the engine?

    <p>Piston slap</p> Signup and view all the answers

    What is the protocol for evaluating or fixing seat belt systems after a collision?

    <p>Inspect belt and buckle operation, then inspect the stitching at the energy management loops</p> Signup and view all the answers

    What is the likely cause of white smoke emitting from the exhaust when the engine is under stress?

    <p>Coolant loss</p> Signup and view all the answers

    What would cause a coolant loss?

    <p>Coolant leak</p> Signup and view all the answers

    Why is it important to check the refrigerant oil level?

    <p>To ensure proper lubrication of the compressor</p> Signup and view all the answers

    What determines the PO135 code's value?

    <p>A short at the power feed terminal at the oxygen sensor heater circuit.</p> Signup and view all the answers

    What causes faded or failing brakes?

    <p>Over heating, low air pressure, and not relying on the engine braking effect.</p> Signup and view all the answers

    What is the right procedure for adjusting excessive valve stem height?

    <p>Grinding material from valve tip.</p> Signup and view all the answers

    What causes a primary pump failure in a hydrostatic system shortly after installation?

    <p>Contamination.</p> Signup and view all the answers

    What is the likely cause of an indicator lamp malfunction?

    <p>A faulty oxygen sensor.</p> Signup and view all the answers

    What is the correct diagnosis for a PO135 code?

    <p>Oxygen sensor heater circuit problem, bank 1, sensor 1.</p> Signup and view all the answers

    What is the likely cause of a car's drivability not being affected by an indicator lamp malfunction?

    <p>The car's engine is not affected by the malfunction.</p> Signup and view all the answers

    What is the relation between the indicator lamp malfunction and the PO135 code?

    <p>The indicator lamp malfunction is a symptom of the PO135 code.</p> Signup and view all the answers

    Which type of sensor delivers positional information?

    <p>Potentiometer</p> Signup and view all the answers

    Which component is commonly found in a battery?

    <p>Sulphuric acid</p> Signup and view all the answers

    What type of wire rope is flexible and suitable for overhead cranes?

    <p>6-37</p> Signup and view all the answers

    What happens when you constantly use the brakes on a lengthy descent?

    <p>Brake fade</p> Signup and view all the answers

    In an engine with reverse cooling, where does the coolant flow from?

    <p>Engine block into the radiator outlet</p> Signup and view all the answers

    How many crankshafts are found in a V-type engine?

    <p>2</p> Signup and view all the answers

    What should be examined before replacing a control module?

    <p>All module powers and grounds</p> Signup and view all the answers

    What happens to the majority of unused energy in a hydraulic system?

    <p>It is converted into heat</p> Signup and view all the answers

    What is the torque transmitted to the driving pinion of the front axle of a four-wheel-drive car in low range (ratio of 1.8:1)?

    <p>162 pounds</p> Signup and view all the answers

    Which of the following braking methods consumes the least amount of fuel?

    <p>engine brake</p> Signup and view all the answers

    Before backing behind a trailer, you must ensure that:

    <p>Tractor protection valve is normal</p> Signup and view all the answers

    What tool can be used to check the continuity of wires that carry digital signals?

    <p>logic probe</p> Signup and view all the answers

    What are the two types of fuel systems for engines with spark ignition?

    <p>carburetor and fuel injection</p> Signup and view all the answers

    What do the majority of electrical gauges rely on?

    <p>battery regulated voltage</p> Signup and view all the answers

    What is the first stage in removing refrigerant from an air conditioning system?

    <p>Identify the type of refrigerant</p> Signup and view all the answers

    What happens when the trailer breaks away from a combination vehicle, separating both air lines?

    <p>Tractor protection valve closes and tractor loses all air pressure</p> Signup and view all the answers

    During a cooling system pressure test, the pressure decreases gradually, but there are no visible exterior leaks. What is the difficulty?

    <p>Transmission cooler is leaking coolant into the transmission.</p> Signup and view all the answers

    How can you tell if your brakes are deteriorating?

    <p>You have to push harder on the brake pedal to control your speed on a downgrade.</p> Signup and view all the answers

    Which of the following may be used to test the functioning of brake warning systems and low air warnings?

    <p>turning on the ignition</p> Signup and view all the answers

    Which of the following conditions is the most likely to cause a vehicle to overheat?

    <p>clogged radiator</p> Signup and view all the answers

    How should an oversize piston of 0.020 be installed?

    <p>Bore the cylinder to 0.022 in (0.56 mm) to provide clearance, then hone to a suitable finish.</p> Signup and view all the answers

    What is the most likely cause of a brake pedal that feels spongy when pressure is applied?

    <p>Air in the brake system</p> Signup and view all the answers

    What should you do if the pressure on the brake pedal is released and speed increases?

    <p>Check the brake system for air leaks</p> Signup and view all the answers

    What is the most likely cause of a transmission cooler that is leaking coolant into the transmission?

    <p>Leaking transmission seals</p> Signup and view all the answers

    What determines the code PO135's value?

    <p>A short at the power feed terminal at the oxygen sensor heater circuit</p> Signup and view all the answers

    What causes faded or failing brakes?

    <p>Over heating, low air pressure, and not relying on the engine braking effect</p> Signup and view all the answers

    What is the right procedure for adjusting excessive valve stem height?

    <p>Grinding material from valve tip</p> Signup and view all the answers

    Shortly after installation, if the primary pump of a hydrostatic system breaks, the failure was caused by which of the following?

    <p>Contamination</p> Signup and view all the answers

    What is the likely cause of an Indicator Lamp Malfunction complaint?

    <p>A short at the power feed terminal at the oxygen sensor heater circuit</p> Signup and view all the answers

    What is the likely cause of a code PO135?

    <p>A short at the power feed terminal at the oxygen sensor heater circuit</p> Signup and view all the answers

    What is the correct procedure for fixing a car with an Indicator Lamp Malfunction complaint?

    <p>Fixing the oxygen sensor heater circuit issue</p> Signup and view all the answers

    What is the likely cause of a car's drivability not being affected by an Indicator Lamp Malfunction complaint?

    <p>The issue is not severe enough to affect drivability</p> Signup and view all the answers

    What determines the frequency of an alternating current signal?

    <p>number of cycles per unit of time</p> Signup and view all the answers

    Which statement about automatic transmission maintenance is true?

    <p>Clutch pack clearances must be measured before replacement</p> Signup and view all the answers

    Why does the camshaft position sensor provide information to the PCM (Engine Computer)?

    <p>determine the crankshaft position information for injector and spark timing</p> Signup and view all the answers

    How is a decrease in front gear accomplished from a basic planetary gear set?

    <p>Carrier assembly must be the input member</p> Signup and view all the answers

    The magnetic field inside an alternator is produced by?

    <p>Rotor armature</p> Signup and view all the answers

    How do you do a service check on the coolant?

    <p>Coolant should be checked for concentration using a hydrometer</p> Signup and view all the answers

    What should be done before replacement in automatic transmission maintenance?

    <p>Clutch pack clearances must be measured</p> Signup and view all the answers

    What is the purpose of the camshaft position sensor?

    <p>to determine crankshaft position for injector and spark timing</p> Signup and view all the answers

    Study Notes

    Hazardous Materials Transportation

    • Dual tires should be inspected every 1 hour or 50 miles while transporting hazardous materials.

    Engine Temperature

    • The Coolant sensor is used to assess engine temperature.

    Descending Steep Slopes

    • The most effective and secure technique for descending a steep slope is to change to a lower gear.

    Battery Composition

    • The electrolyte of a battery is a combination of water and sulfuric acid.

    Valve Timing

    • If the valve timing is delayed due to a stretched timing belt in a single overhead camshaft engine, high RPM power will be reduced.

    Electrical Connection

    • The integrity of an electrical connection should be tested by checking for tightness, then performing a voltage drop test across the connector.

    Measuring Unknown Voltage

    • When measuring an unknown voltage or current, set the range selection to a point midway between the lowest and the highest range, and work upward and downward until the proper range is determined.

    Suspension Systems

    • The auxiliary spring suspension system is positioned above the main leaf spring assembly and is only used under severe loads.

    Supplemental Inflatable Restraints

    • When changing the coil assembly in the steering column of a Supplemental Inflatable Restraint, lock the steering column, and disable the airbag.

    Coolant Freeze Protection

    • A hydrometer is used to measure the proper coolant freeze protection.

    Battery State of Charge

    • A specific gravity of 1.225 at 80°F indicates that a battery's state of charge is approximately 75%.

    Suspension Testing

    • If a tire vibrates at 40 to 60 kilometers per hour, the suspension is tested by bouncing the vehicle five or six times before coming to rest, indicating a weak or broken spring.

    Gas Container Pressure

    • The pressure gauge on a container carrying a gas would indicate a lower reading if the gas is cooled.

    Towing Multiple Trailers

    • The heaviest trailer should follow the tractor while towing several trailers.

    Compressor Clutch Engagement

    • If a compressor clutch will not engage and the power and ground at the clutch coil are good, the most likely cause is an incorrect air gap.

    Charging System Output

    • If the charging system's output is below the rated output, the test that should be performed is an alternator output (full-field test).

    Trailer Towing Distance

    • When driving a 100-foot tandem trailer combo at 50 miles per hour on a dry road with adequate visibility, a 13-second gap should be maintained.

    Exhaust Smoke

    • Blue exhaust smoke is likely caused by a leaking injector cup.

    Torque Converter Lockup

    • A shuddering situation during torque converter lockup is repaired by checking the refrigerant oil level.

    Diesel Engine Power

    • During a road test, fuel temperature and exhaust back pressure are evaluated to certify that a diesel engine has low power.

    Starter Motor Issues

    • A low amperage draw and sluggish cranking speed are likely caused by high starter cable resistance.

    Paver Conveyer Bearings

    • Failure of the conveyer bearings on a paver is often caused by a lack of lubricant on the chains.

    Engine Noise

    • An engine noise that sounds like a knock at the side of the engine that is louder when the engine is cold and goes away or is reduced when the engine reaches operating temperature is likely caused by piston slap.

    Seat Belt Systems

    • After a collision, the protocol for evaluating or fixing seat belt systems is to inspect belt and buckle operation, then inspect the stitching at the energy management loops.

    Engine Coolant Loss

    • If coolant was recently supplied to a heated engine and the exhaust emits white smoke, there is a coolant loss.

    Block and Tackle

    • 250 pounds of block and tackle with five rope falls and little friction require 125 pounds of power to keep.

    Piston and Ring Assembly

    • Removing the ring ridge before removing the piston/rod assembly is done to prevent damage to the piston ring lands.

    Clutch Replacement

    • When changing a clutch, the transmission should be installed, then the bore alignment should be checked.

    Warning Lamp Diagnosis

    • If a warning bulb does not illuminate, but does when the cable connecting the lamp to the transmitting device is grounded, it suggests that the sending unit is defective.

    Starter Motor Issues

    • If the starting armature spins, but the engine does not start, the most likely cause is that the engine is seized.

    Air Tank Pressure

    • A warning is provided before air pressure in the air tank falls below 60psi.

    Engine Idling

    • The primary purpose of idling the engine prior to shutting it off is to give the engine oil time to properly lubricate the turbo-compressor.

    Snap Throttle Test

    • During a snap throttle test, vacuum falls to 8 inches Hg (27 kPa) and then recovers to 18 inches Hg (61 kPa), suggesting a restricted exhaust system.

    Alternator Troubleshooting

    • A faulty field circuit may cause an alternator to have zero output, as suggested by Technician 1.
    • A blown fusible link from the battery to the alternator could also be the cause, as suggested by Technician 2.

    Automatic Transmission Repair

    • Clutch packs can be pressure tested using low pressure air, not high pressure air.
    • Metal contaminated coolers can be flushed and re-used, but not torque converters.

    Parking Brake Maintenance

    • Before disassembling a parking brake with a spring, the spring should be caged.

    Suspension and Steering

    • A worn relay rod ball socket can cause a vehicle to wander, as suggested by Technician 1.
    • The adjustment limit for the tie rod may be out of spec, as suggested by Technician 2.

    Tractor-Trailer Safety

    • Before backing beneath a tractor-trailer, the electrical service cable must be connected.

    Diesel Engine Diagnosis

    • During a road test, fuel temperature and exhaust back pressure are evaluated to certify that a diesel engine has low power.

    Starter Motor Troubleshooting

    • A high mechanical resistance or shorted armature can cause a low amperage draw and sluggish cranking speed.

    Paver Maintenance

    • Lack of lubricant on the chains of a paver can lead to the failure of the conveyor bearings.

    Engine Noise Diagnosis

    • A knocking sound that is louder when the engine is cold and goes away or is reduced when the engine reaches operating temperature suggests a piston slap.

    Seat Belt Systems

    • After a collision, seat belt systems should be evaluated by inspecting belt and buckle operation, then inspecting the stitching at the energy management loops.

    Coolant Leaks

    • White smoke from the exhaust suggests a coolant loss, possibly due to a recent coolant supply to a heated engine.

    Gear Pump Operation

    • Operation with a high pump inlet restriction can cause the housing of a gear pump to break or the pump shaft to detach.

    Brake Adjustment

    • The slack adjuster should be checked by parking on level ground, turning off the parking brake, and pressing the brake pedal.

    Connecting Rod Damage

    • A bent connecting rod can be caused by leaking liner O-rings, hydrostatic lock, piston to valve contact, or excessive bearing clearance.

    Air Brake System

    • Twin parking control valves can be used to balance the service brake system or apply more brake pressure if the main tank is getting low.

    Emergency Stopping

    • The stab braking technique with air brakes involves pressing hard on the brake pedal and applying full hand valve until stopped.

    Seat Anchor Bolt Replacement

    • When replacing seat anchor bolts, the thread sealer should be removed from the threads, and new bolts should be installed with an impact wrench.

    Turbocharger Operation

    • The turbocharger of a diesel engine is linked to the engine's exhaust manifold to be activated.

    Torque Converter Installation

    • When installing a torque converter on a transmission, the converter run-out should be checked.

    Electronic Throttle Control

    • A defective ECT return spring malfunction can cause a rough idle, low power, detonation, or high idle.

    Suspension Systems

    • An air spring suspension system can be installed above the primary leaf spring assembly and would only be used while carrying big loads.

    Air Bag Systems

    • When working with air bag systems, the multi-function switch should be disconnected to prevent deployment.

    Electronic Control Modules

    • When diagnosing a stored DTC P1121 Electric Throttle Control Actuator, the Electronic Controlled Throttle circuit should be tested using a lap-top computer and manufacturer software.

    Engine Spark Plug Wires

    • Spark plug wires should be installed in the correct order to prevent engine misfire, stalling, backfiring, or other issues.

    RAM

    • RAM stands for Random Access Memory.

    Acetylene Cylinders

    • Acetylene is stabilized by acetone in an acetylene cylinder.

    Fuel Injection Systems

    • In a fuel injection system, closed loop functioning is based on the oxygen content of exhaust gases, fuel pressure, and volume of intake air.

    Fuel Consumption

    • The cost of fuel needed to travel a certain distance can be calculated by multiplying the fuel consumption per 100km by the cost of fuel per litre.

    Truck and Transport Mechanic Exam Questions

    Low Lubricant Levels

    • If the lubricant level in the differential, steering reservoir, or gearbox is very low, fill to the proper level with the specified lubricant.

    Measuring Main Bearing Clearance

    • To measure main bearing clearance using plastigage, install plastigage, lubricate the journal, torque the bearing cap, and read the clearance.

    Electric Transformer

    • The ratio of the primary winding to the secondary of an electric transformer with 240 turns in the primary winding and 15 turns in the secondary winding is 240/15.

    Sealed Bearing Temperature

    • The maximum allowable temperature for a sealed bearing is 160ºF.

    Hazardous Materials on a Bus

    • Emergency drug shipments, tear gas, and emergency hospital supplies should never be transported with passengers on a bus.

    Engine, Suspension, and Driveline Problems

    • Technician 2 is correct: start with simple inspections first to ensure that you have not overlooked something, and use the scan tool for further clarification.

    Road Test for Diesel Engine Low Power

    • During a road test, fuel temperature and exhaust back pressure are evaluated to certify that a diesel engine has low power.

    Low Amperage Draw and Sluggish Cranking Speed

    • A low amperage draw and a sluggish cranking speed can be caused by high mechanical resistance, a shorted armature, or high starter cable resistance.

    Failure of Conveyer Bearings on a Paver

    • Lack of grease can lead to the failure of the conveyer bearings on a paver.

    Engine Noise

    • An engine noise that sounds like a knock at the side of the engine, is louder when the engine is cold, and goes away or is reduced when the engine reaches operating temperature, is likely caused by a wrist pin or piston slap.

    Seat Belt System Evaluation

    • The protocol for evaluating or fixing seat belt systems after a collision is to inspect the belt and buckle operation, then inspect the stitching at the energy management loops.

    Coolant Loss

    • A coolant loss, recently supplied to a heated engine, with white smoke emitted from the exhaust when the engine is under stress, indicates a problem.

    Instrument Cluster Warning Gauges

    • If all warning gauges in the instrument cluster read high, the cause is not a shorted ground.

    Balancing Coil Gauge

    • When a balancing coil gauge indicates a high reading, the sending unit will have low resistance.

    Rebuilding Dual Countershaft Transmission

    • The next step after rebuilding the auxiliary part of a dual countershaft transmission is to install the high/low range synchronizer.

    Power Steering Box Adjustment

    • The proper adjustment sequence for a power steering box is to adjust poppets, sector shaft endplay, and input shaft preload.

    Oxygen Sensor Testing

    • A quality O2 sensor will have a voltage range of 0.200 volts to 0.800 volts during oxygen sensor testing.

    Car Battery

    • A 12-volt car battery has six cells connected in series.

    Air Conditioning Performance Test

    • If the compressor outlet is hot during an air conditioning performance test, it may indicate an overcharged system.

    Engine Oil Circulation

    • The engine's oil circulates from the sump to the oil pump to the bearings to the filter.

    Inflating a Wheel and Tire Assembly

    • When inflating a wheel and tire assembly, cage or confine the wheel and tire assembly and use a remote fill/deflate device.

    Electronic Control System

    • Before opening a connection in the sensor harness of an electronic control system, ensure the key switch is turned off.

    HEUI Fuel System

    • A HEUI fuel system can be difficult or impossible to start if the engine oil pressure is high, the engine oil level is high, or there is a leaking injector oil return.

    Hydrostatic Drive System

    • If a hydrostatic drive system functions in backward but not forward, it may be caused by servo pistons being scored, the drive motor being overloaded, or low charge pump pressure.

    Linear Positioner Circuit

    • The first step to take when a linear positioner circuit malfunctions is to remove the air bag module first and set it aside for safety.

    Check Engine Light

    • If the yellow check engine light is illuminated, repair the system for active fault codes.

    Spark Plug Wires

    • If the spark plug wires are not installed in the correct order, the engine will misfire upon starting.

    RAM

    • RAM stands for Random Access Memory.

    Acetylene Cylinder

    • Acetylene in a cylinder is stabilized by acetone.

    Closed Loop Functioning in Fuel Injection

    • The basis for closed-loop functioning in a fuel injection system is the oxygen content of exhaust gases.

    Fuel Cost

    • The cost of fuel needed to travel 620km, using premium unleaded fuel at 1.50perlitre,withafuelconsumptionof12litresper100km,is1.50 per litre, with a fuel consumption of 12 litres per 100km, is 1.50perlitre,withafuelconsumptionof12litresper100km,is112.

    Electrical Panel

    • A huge single panel, frame, or assemblage of panels on which switches, overcurrent and other protection devices, buses, and often instruments are placed on the face, back, or both is called a panelboard.

    Hazardous Materials Transportation

    • Dual tires should be inspected every 50 miles or 3 hours when transporting hazardous materials.

    Engine Sensors

    • The Coolant sensor is used to assess engine temperature.

    Descending a Steep Slope

    • The most effective and secure technique for descending a steep slope is to change to a lower gear.

    Battery Electrolyte

    • The electrolyte of a battery is a combination of water and sulfuric acid.

    Engine Performance

    • If the valve timing is delayed due to a stretched timing belt in a single overhead camshaft engine, low RPM power will be reduced.

    Electrical Connection Testing

    • The integrity of an electrical connection should be tested for tightness, then a voltage drop should be performed across the connector.

    Cylinder Head Bolts

    • Cylinder head bolts are usually lubricated with silicone spray.

    Emergency Braking

    • To prevent a collision when driving a double trailer, use controlled or stab braking.

    Endurance Braking Systems

    • Endurance braking systems are beneficial for descent of long hills.

    Fuel Gauge

    • If a fuel gauge reads full, the most likely cause is a wire to the sending unit being grounded or a float stuck in the up position.

    Hydrostatic Axial Piston Drive Motor

    • A restricted inlet line or filters can cause the hydrostatic axial piston drive motor to fail completely.

    Fuel Consumption

    • Implementing engine braking is a method to reduce fuel consumption.

    Slack Adjusters

    • Slack adjusters are an adjusting nut on the backside of the brake drum used for adjusting the brakes.

    Driveline Vibration

    • Loose connection on the oil inlet side of the pump can produce vibration in the driveline.

    Torque Transmission

    • If 180 foot-pounds of torque are input at the input shaft of the transfer case, 162 pounds of torque are transmitted to the driving pinion of the front axle of a four-wheel-drive car in low range (ratio of 1.8:1).

    Braking Methods

    • Engine braking consumes the least amount of fuel.

    Backing Behind a Trailer

    • Before backing behind a trailer, the air brakes must be off, and the tractor protection valve must be normal.

    Trailer Breakaway

    • If the trailer breaks away from a combination vehicle, separating both air lines, the trailer brakes will activate and the air lines will separate.

    Wire Continuity

    • A logic probe can be used to check the continuity of wires that carry digital signals.

    Fuel Systems

    • The two types of fuel systems for engines with spark ignition are carburetor and fuel injection.

    Electrical Gauges

    • The majority of electrical gauges rely on battery-regulated voltage.

    Refrigerant Removal

    • The first stage in removing refrigerant from an air conditioning system is to identify the type of refrigerant.

    Diesel Engine Performance

    • During a road test, fuel temperature and exhaust back pressure are evaluated to certify that a diesel engine has low power.

    Battery Condition

    • A low amperage draw and sluggish cranking speed can be caused by a shorted armature.

    Conveyor Bearing Failure

    • Lack of lubricant on the chains can lead to the failure of the conveyor bearings on a paver.

    Engine Noise

    • A knock at the side of the engine that is louder when the engine is cold and goes away or is reduced when the engine reaches operating temperature is likely caused by piston slap.

    Seat Belt Inspection

    • The protocol for evaluating or fixing seat belt systems after a collision involves inspecting belt and buckle operation, then inspecting the stitching at the energy management loops.

    Coolant Loss

    • A recent coolant supply to a heated engine can cause coolant loss.

    Indicator Lamp Malfunction

    • The code PO135 is determined by a bad connection at the ground terminal of the oxygen sensor heater circuit.

    Faded or Failing Brakes

    • Faded or failing brakes can be caused by overheating, low air pressure, and not relying on the engine braking effect.

    Valve Stem Height Adjustment

    • The right procedure for adjusting excessive valve stem height is grinding material from the valve tip.

    Hydrostatic System Failure

    • Contamination can cause the primary pump of a hydrostatic system to break shortly after installation.

    Universal Joints and Engine Mounts

    • Over-lubricated universal joints can lead to crossed plug wires and bad engine mounts.

    Sensors and Battery Components

    • A potentiometer is a sensor that delivers positional information, like a power seat sensor.
    • Sulphuric acid and water are common components of a battery.
    • Adhesion promoter is also a component of a battery.

    Brake Systems

    • Constantly using the brakes on a lengthy descent may lead to brake fade or wheel lockup.
    • The mechanism that applies and releases the brakes when the brake pedal is depressed is the emergency parking service.

    Engine Cooling Systems

    • Engines that use reverse cooling pump the coolant from the engine block into the radiator outlet.
    • A V-type engine has two crankshafts.
    • In a hydraulic system, the majority of the unused energy is converted into heat.

    Air Conditioning Systems

    • The first stage in removing refrigerant from an air conditioning system is to identify the type of refrigerant.

    Fuel Systems

    • The two types of fuel systems for engines with spark ignition are carburetor and fuel injection.

    Electrical Systems

    • The majority of electrical gauges rely on regulated voltage from the battery and alternator.
    • A logic probe is a tool that can be used to check the continuity of wires that carry digital signals.

    Braking Methods

    • The braking method that consumes the least amount of fuel is engine braking.

    Trailer Braking Systems

    • Before backing behind a trailer, the tractor protection valve must be normal and the trailer brakes must be locked.

    Refrigerant Removal

    • The first stage in removing refrigerant from an air conditioning system is to identify the type of refrigerant.

    Cooling System Pressure Test

    • During a cooling system pressure test, a gradual decrease in pressure may indicate a cylinder head gasket leak or a cracked cylinder head.

    Brake Deterioration

    • Signs of deteriorating brakes include having to push harder on the brake pedal to control speed on a downgrade, or feeling spongy when pressure is applied to the pedal.

    Vehicle Overheating

    • A vehicle is most likely to overheat due to a clogged radiator or restricted heater core.

    Piston Installation

    • To install an oversized piston, the cylinder should be bored to the actual piston size, then honed for clearance.

    Indicator Lamp Malfunction

    • A code PO135 indicates a problem with the O2 sensor heater circuit, bank 1, sensor 1.

    Faded or Failing Brakes

    • Faded or failing brakes can be caused by overheating, low air pressure, and not relying on the engine braking effect.

    Valve Adjustment

    • To adjust excessive valve stem height, the valve seat should be ground to provide clearance.

    Hydrostatic System Failure

    • Contamination is a common cause of primary pump failure in a hydrostatic system.

    Alternating Current Signal

    • The frequency of an alternating current signal is determined by the number of cycles per unit of time.

    Automatic Transmission Maintenance

    • Clutch pack clearances must be measured before replacement in automatic transmission maintenance.

    Camshaft Position Sensor

    • The camshaft position sensor provides information to the PCM to determine injection and spark timing.

    Planetary Gear Set

    • To decrease the gear ratio in a planetary gear set, the sun gear must be held, and the carrier assembly must be the output member.

    Alternator Magnetic Field

    • The magnetic field inside an alternator is produced by the rotor and stator.

    Coolant Service Check

    • To do a service check on the coolant, the pH level, electrolytic level, and concentration should be checked using a hydrometer.

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    Test 1.docx

    Description

    Test your knowledge of CDL regulations and safety procedures for transporting hazardous materials, including vehicle inspection and engine maintenance.

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