Gasoline Vapour Emissions Control Mechanism
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Questions and Answers

  1. The mechanism for controlling fuel vapour emissions stores gasoline vapour in?

  • a) plastic container
  • b) charcoal canister (correct)
  • c) the fuel tank
  • d) none of the above

    1. Preliminary diagnosis on an electronically controlled automatic transmission/transaxle consists of all the following tests, except which of the following?

  • a) Flex plate check (correct)
  • b) Stall test
  • c) Fluid check
  • d) Line pressure test

    1. When the clutch pedal is pushed when a car with a manual gearbox is moving downhill, what happens to the vehicle's torque and horsepower?

  • a) torque and power are transferred to the tires
  • b) torque and power are transferred back to engine (correct)
  • c) torque from the fly wheel is realized as power in the transmission
  • 4) Which of the following is the final adjustment method for air brakes?

    1. Which of the following is the final adjustment method for air brakes?

    <p>a) Adjust slack adjuster in direction of brake application and check for brake drag</p> Signup and view all the answers

    1. An air conditioning unit emits an odour. What method do you use to eliminate the odour?

    <p>b) Remove air box and sanitize the evaporator.</p> Signup and view all the answers

    1. Following the installation of a new accessory belt, you must?

    <p>c) check belt tension after running engine</p> Signup and view all the answers

    1. How is the low pressure warning signal tested?

    <p>c) Shut off the engine with enough air pressure, turn on the electrical power and step on and off the brake pedal until the low air pressure warning signal comes on.</p> Signup and view all the answers

    1. Which of the following is the initial step in detecting an electronic control system malfunction?

    <p>c) Connect a scan tool and read active diagnostic fault codes.</p> Signup and view all the answers

    1. When reversing a tractor under a trailer, the whole air system must be?

    <p>b) at normal pressure</p> Signup and view all the answers

    1. Technician 1 says one heater hose is hot to the touch and the other hose is cold when the heater core is functioning okay. Technician 2 says the upper radiator hose should be at engine operating temperature, which is very hot to the touch. Which tech is correct?

    <p>a) tech 2</p> Signup and view all the answers

    1. When a technician is checking the radiator coolant level, the engine should be?

    <p>b) cold</p> Signup and view all the answers

    1. How can a jammed open intake check valve of a closed loop hydrostatic drive system influence system operation?

    <p>d) Reduced speed and torque in one direction and normal in the other.</p> Signup and view all the answers

    1. You execute a pre-alignment examination and see a tire with a cupped wear pattern. Why?

    <p>d) Worn shock absorbers and static imbalance.</p> Signup and view all the answers

    1. In which of the following situations must the fuel injectors of a paver be bled?

    <p>a) following a lack of fuel.</p> Signup and view all the answers

    1. WCB standards stipulate that horizontally stored or transported acetylene cylinders must be repositioned in a vertical posture for a minimum of?

    <p>b) one hour</p> Signup and view all the answers

    1. What must a car with air brakes have?

    <p>a) At least two air tanks.</p> Signup and view all the answers

    1. How do you remove rear wheel hubs if the axle cannot be removed?

    <p>a) Ensure brakes are released</p> Signup and view all the answers

    1. What should a driver do to deter criminal activity and boost passenger confidence?

    <p>b) perform basic security checks on vehicle</p> Signup and view all the answers

    1. A fundamental starting control circuit powers the magnetic switch through the ignition switch and the?

    <p>d) neutral start switch.</p> Signup and view all the answers

    1. What should you hear when the hand valve is engaged and the trailer brakes are being tested by opening the rear service line valve?

    <p>a) Air escape from the open valve</p> Signup and view all the answers

    1. Which of the following will lessen the braking force produced by an air- over-hydraulic booster system?

    <p>d) Low reservoir air pressure.</p> Signup and view all the answers

    1. A switch rated in horsepower that may interrupt the maximum operational overload current of a motor with the same horsepower rating as the switch at the rated voltage is rated in which of the following?

    <p>b) Switch, Motor-Circuit</p> Signup and view all the answers

    1. What are the windings of a solenoid with two coils called?

    <p>b) pull-in and hold-in.</p> Signup and view all the answers

    1. For a vertical lift to sustain two tonnes, what diameter rope is required?

    <p>b) ½”</p> Signup and view all the answers

    1. What form of signal do knock (detonation) sensors generate?

    <p>c) AC sine wave.</p> Signup and view all the answers

    1. A code for a coolant sensor is kept. A DVOM reveals 0 volts on the sense line circuit of the coolant temperature sensor. This might be caused by a defective connection or an open in the sense line. How should we test this?

    <p>a) Disconnect the sensor, jump the terminals then watch the scan tool for a high temperature reading.</p> Signup and view all the answers

    1. What does the acronym MIG mean?

    <p>b) metallic-inert gas</p> Signup and view all the answers

    1. What prevents air loss if the air compressor develops a leak?

    <p>d) The one way check valve</p> Signup and view all the answers

    1. How would you define a Class B fire?

    <p>d) Fires involving flammable liquids, gases, gasoline and synthetic or oilbased products.</p> Signup and view all the answers

    1. Which of the following would cause the hydrostatic system to cease functioning entirely?

    <p>a) Charge pump failure.</p> Signup and view all the answers

    1. How often must tachographs be calibrated?

    <p>d) 6yrs</p> Signup and view all the answers

    1. How often must tachographs be inspected?

    <p>d) 2 yrs</p> Signup and view all the answers

    1. Which statement correctly describes the connection between torque, power, and fuel consumption?

    <p>c) as torque increases, power and fuel consumption increase</p> Signup and view all the answers

    1. An open fault in a starting solenoid switch's hold-in winding may likely result in?

    <p>b) solenoid to move in and out, or chatter.</p> Signup and view all the answers

    1. Which of the following would be the source of the issue when the transmission shifts harshly, the input bearing is loud, and the unit has had many clutch failures?

    <p>d) Clutch housing alignment.</p> Signup and view all the answers

    1. Which of the following is the correct way to heat a bearing before installation?

    <p>d) Heat cabinet or oven.</p> Signup and view all the answers

    1. A parallel circuit consists of what?

    <p>c) current can flow through more than one path.</p> Signup and view all the answers

    1. How can you determine if the spring brakes engage automatically?

    <p>b) Step on and off the brake, with the engine off, the parking brake knob should pop out when air pressure falls between 20-40 psi.</p> Signup and view all the answers

    1. To what RPM should the VAT-40 load tester be set while conducting a charging system output test?

    <p>2000 rpm</p> Signup and view all the answers

    1. Which of the following accurately describes the connection between watts and horsepower?

    <p>c) 1 hp = 746 W</p> Signup and view all the answers

    1. What kind of transmitting unit does the fuel gauge use?

    <p>b) a float.</p> Signup and view all the answers

    1. What should be examined to pinpoint the precise location of a suspected weak connection issue in an electrical circuit?

    <p>b) Available voltage at the load, then proceed to check for voltage drops at other connections in the circuit.</p> Signup and view all the answers

    1. Which of the following cannot render all gauges inoperable inside a bimetallic gauge system?

    <p>c) sending unit ground connection</p> Signup and view all the answers

    1. Which of the following is the main purpose of grounding?

    <p>c) redirects excess current to the earth</p> Signup and view all the answers

    1. As the metal cools after being sliced with a flame, it will?

    <p>b) contract</p> Signup and view all the answers

    1. What may lawfully retain a truck or bus emergency brake in place?

    <p>c) spring pressure</p> Signup and view all the answers

    1. Resistance to change in the motion of a vehicle is known as which of the following?

    <p>a) inertia</p> Signup and view all the answers

    1. What sort of lifting method has the lowest lifting capability while utilising the same rope?

    <p>d) Choker sling</p> Signup and view all the answers

    1. Typically, timing chains are changed when the chain slack reaches what?

    <p>b) 1/2in</p> Signup and view all the answers

    1. This antifreeze mixture will give enough winter freeze protection for a cooling system with a capacity of 9.5 litres at the lowest cost?

    <p>d) 5.0 L of coolant and 4.5 L of distilled water.</p> Signup and view all the answers

    1. Dangerous items transported by bus must be?

    <p>a) properly labeled</p> Signup and view all the answers

    1. What is the right fluid to use in a vehicle's rear axle assembly?

    <p>c) API GL5</p> Signup and view all the answers

    1. Most new automobiles are sold?

    <p>a) Pre-packed bearings for most front end lube joints.</p> Signup and view all the answers

    1. Which of the following cannot render the low beam headlights inoperable while the high beam headlamps function normally?

    <p>d) The defective headlamp.</p> Signup and view all the answers

    1. What do the majority of front driver-side Air Bag inflator modules consist of?

    <p>b) Sodium Anzide canisters that burn to deploy the air bag.</p> Signup and view all the answers

    1. When is the resistance to current flow lessened, it will?

    <p>b) corroded terminals are replaced</p> Signup and view all the answers

    1. Which of the following is shown by the illustration below?

    <p>b) pictorial diagram</p> Signup and view all the answers

    1. What is the right proportion of water to sulfuric acid in battery electrolyte?

    <p>a) 65 percent water to 35 percent sulfuric acid</p> Signup and view all the answers

    1. What converts alternating electricity to direct current in an alternator?

    <p>c) rectifier</p> Signup and view all the answers

    1. The temperature transmitting unit's wire is disconnected (magnetic gauge). What does the reading of 0v on a voltmeter linked to a wire indicate?

    <p>b) open circuit in the gauge circuit.</p> Signup and view all the answers

    1. After a full stop with no external leaks, which of the following would cause the brake pedal to sink to the floor?

    <p>a) faulty cup in the master cylinder.</p> Signup and view all the answers

    1. Due to a fluid leak, which of the following shock absorbers should be considered for replacement?

    <p>b) fails the bounce test.</p> Signup and view all the answers

    1. A wiring diagram employs which of the following to label components?

    <p>a) symbols</p> Signup and view all the answers

    1. Which of the following prevents the crane block from ascending?

    <p>d) upper limit switch</p> Signup and view all the answers

    1. The piston of a cylinder leakage tester exerts air pressure to the cylinder.

    <p>c) at TDC and both valves closes</p> Signup and view all the answers

    1. How frequently should the air tanks be drained?

    <p>b) On a daily</p> Signup and view all the answers

    1. Using twin element time delay fuses, the branch-circuit protection for a 1, 115v, 3 hp motor would typically have how many amps?

    <p>a) 60 amps</p> Signup and view all the answers

    1. When the air-fuel combination ignites before the spark plugs, this phenomenon is known as?

    <p>d) pre-ignition</p> Signup and view all the answers

    1. Which of the following components on a traditional mechanical crane needs a daily oil level check?

    <p>b) torque converter.</p> Signup and view all the answers

    1. Which of the following factors determines the engine's stroke?

    <p>b) crankshaft</p> Signup and view all the answers

    1. What is the proper process for replacing the universal joint in the middle of a two-piece driveshaft?

    <p>b) Remove the retaining clips, and push the cups out using a ball joint press.</p> Signup and view all the answers

    1. Why is it necessary to continuously retorque wheel nuts after short-term use?

    <p>d) Worn stud holes in the rim.</p> Signup and view all the answers

    1. What is an alcohol evaporator used for?

    <p>c) reduce the risk of ice in the brake valves and other parts in cold weather</p> Signup and view all the answers

    1. What is the approximate relation between the number of teeth on the starting motor pinion gear and the number of teeth on the engine flywheel?

    <p>b) 1 to 20.</p> Signup and view all the answers

    1. Which of the following would generate vibration, a loud crash over rough terrain, and out-of-phase driveshaft?

    <p>d) Twisted driveshaft due to severe shock loads.</p> Signup and view all the answers

    1. A flashback arrestor protects the operator from what while using oxy-fuel cutting and welding equipment?

    <p>d) flame traveling into the hoses</p> Signup and view all the answers

    1. What is the proper approach for repairing heat-shrinkable tubing?

    <p>b) Solder the wires, then position the tubing and apply heat.</p> Signup and view all the answers

    1. Which of the following types of valve seal moves up and down with the valve?

    <p>a) umbrella seals</p> Signup and view all the answers

    1. Refer to the following table. What is the issue when a vehicle fails enhanced emissions due to excessive nitrogen oxides (NOx)?

    <p>b) The EGR solenoid has an open ground</p> Signup and view all the answers

    1. In chilly conditions, which of the following should you do when the instrument panel sign illuminates after starting the roller?

    <p>b) keep engine idling to let oils heat up.</p> Signup and view all the answers

    1. Which of the following situations would cause a rotary air compressor to provide low output air?

    <p>a) Excessive rotor to housing clearance.</p> Signup and view all the answers

    1. How is a valve for the recirculation of exhaust gases replaced?

    <p>a) Make sure valve is the correct type then clear the passage in the intake.</p> Signup and view all the answers

    1. What further steps must be taken when a hydrostatic motor has failed and the motor has been replaced?

    <p>d) Flush the system, replace filters, change oil and replace or service pump.</p> Signup and view all the answers

    1. Should the Spiral Clock Spring (Spiral Ribbon) in the combo switch be?

    <p>c) should be changed due to the heat generated from the air bag deployment.</p> Signup and view all the answers

    1. Which of the following would result in a high temperature measurement on a rear axle's input pinion after overhaul?

    <p>a) Excessive pinion bearing preload</p> Signup and view all the answers

    1. On a tractor, an application of 60 pressure is necessary to stop when it is not linked to a trailer, while an application of 30 psi is required when it is attached to a trailer. What is required?

    <p>b) Check the bobtail proportioning valve to ensure proper functioning</p> Signup and view all the answers

    1. What component of a vehicle maintains or stores electricity?

    <p>c) battery</p> Signup and view all the answers

    1. How do you address the issue if the antifreeze in a cooling system that has been inspected for coolant contamination is cloudy?

    <p>b) Drain and flush the system then add new coolant.</p> Signup and view all the answers

    1. What is the correct method for adding solder to a splice connection?

    <p>b) the solder is applied to the splice after it has been heated for a few seconds.</p> Signup and view all the answers

    1. Which of the following electronically controlled suspension sensors is verified by removing the sensor's mounting bolts with the ignition on and the engine off (KOEO) and analysing the scan tool data for proper operation?

    <p>b) G sensor</p> Signup and view all the answers

    1. Which of the following might cause a car with a drained or disconnected battery to perform poorly?

    <p>a) Learned value has been lost from RAM</p> Signup and view all the answers

    1. Which of the following is most essential when removing hydraulic cylinders from a roll-off truck's dump section?

    <p>b) Mechanically support any structure attached to the cylinders.</p> Signup and view all the answers

    1. How do the majority of front passenger side Air Bag inflator modules fill the air bag system?

    <p>c) high pressure gas from a storage cylinder</p> Signup and view all the answers

    1. What is the problem with the passenger side electric door lock if the voltage tests are normal?

    <p>c) Damaged or jammed parts inside the door.</p> Signup and view all the answers

    1. When the temperature approaches, should vehicles be let to warm up inside before being lubricated?

    <p>) 0 degrees F.</p> Signup and view all the answers

    1. Which of the following is the most probable reason when a shop oscilloscope shows a lower voltage is necessary for the spark to leap the gap while measuring low firing voltages?

    <p>b) Rich air/fuel mixture</p> Signup and view all the answers

    1. When utilising a hydraulic accumulator for volume and the accumulator is functioning correctly, should heat be felt?

    <p>d) In the lower 2/3rds of the shell</p> Signup and view all the answers

    1. Which of the following may be the cause when a technician moves the gear selector lever from the park position to the manual low position and cannot hear the detent and the pointer indicating the gear position is misaligned?

    <p>b) adjust control cable</p> Signup and view all the answers

    1. A flat bed trailer has a load limit posted of 5 tonnes. Several pieces of equipment that have their weight tagged by the company have been loaded on the truck. The tags show 3850 pound, 375 pounds, 1550 kilogrammes and

    2973 pounds. Which of the following is the total weight in kg with all the equipment loaded on the trailer?

    <p>4429.2kg</p> Signup and view all the answers

    1. The rotational motion of an engine is known as which of the following?

    <p>b) torque</p> Signup and view all the answers

    1. Two technicians are discussing the 25% duty cycle of a cooling fan's electrical motor. Technician A reports that the pulse width is 25% in hertz. According to Technician B, this means the fan is ON 25% of the time and OFF 75% of the time.

    <p>d) Technician B only.</p> Signup and view all the answers

    1. What steps are taken if a vehicle has issues with steering, suspension, or braking?

    <p>b) Test the brakes and handling at low speeds, then road test on several different surfaces while trying to recreate the condition.</p> Signup and view all the answers

    1. What should the lubricant for manifold heat control valves be?

    <p>a) Flake graphite.</p> Signup and view all the answers

    1. It takes a minute for the vehicle to move once the "drive" gear has been selected. Which of the following would likely lead to this issue?

    <p>b) A partially plugged screen.</p> Signup and view all the answers

    1. Which of the following is the best measuring instrument to use for troubleshooting a three-phase motor’s over-current protection opened instantly when the motor is turned on?

    <p>c) Megohmmeter.</p> Signup and view all the answers

    1. Prior to reconditioning the valve seats, the valves should be?

    <p>b) valve guides should be reconditioned</p> Signup and view all the answers

    1. What are the two components of the fuel system that expel gasoline vapour from the charcoal canister?

    <p>a) carburetor and fuel tank</p> Signup and view all the answers

    1. What are the methods for servicing an air tank with considerable oil and water buildup?

    <p>d) Repair compressor and replace the air dryer.</p> Signup and view all the answers

    1. Which of the following devices controls the outputs of a computer?

    <p>a) motors, lamps, relay, and solenoids</p> Signup and view all the answers

    1. How are frame flanges prevented from collapsing during U-bolt accessory installation?

    <p>d) Install steel blocks in the frame flanges</p> Signup and view all the answers

    1. When a notch is present on the head of a piston, it will typically face which of the following?

    <p>a) front of the engine</p> Signup and view all the answers

    1. On a distributor ignition system, cold starts are difficult. What circumstances will result in this?

    <p>c) Spark plugs gapped too closely.</p> Signup and view all the answers

    1. Which of the following components of the electrical system charges the battery?

    <p>c) alternator</p> Signup and view all the answers

    1. How do you check the transmission fluid in an automatic transmission?

    <p>d) Start the engine and then read the level on the transmission dipstick while observing colour and smell of the fluid</p> Signup and view all the answers

    1. What does this emblem on a pair of safety boots indicate?

    <p>c) The boots are electrically insulating.</p> Signup and view all the answers

    1. What does reversing the direction of current in a DC motor's field and armature accomplish?

    <p>c) rotation remaining the same</p> Signup and view all the answers

    1. In relation to testing a battery using an electronic conductance or continuity tester, technician 1 says some of these testers can load test a battery, but technician 2 says you need to make sure that the ignition switch and all accessories are off. Which tech is correct?

    <p>a) tech 2</p> Signup and view all the answers

    1. Which of the following tests is performed prior to removing a clogged heater core?

    <p>c) Compare the inlet and outlet temperatures.</p> Signup and view all the answers

    1. Which of the following will happen to an inline axial piston pump if the housing drain port is blocked when the pump is running at high pressure?

    <p>b) shaft seal will fail and start leaking.</p> Signup and view all the answers

    1. Which of the following motor oils may reduce fuel consumption?

    <p>b) synthetic</p> Signup and view all the answers

    1. What is a clutch safety switch?

    <p>d) Both b and c</p> Signup and view all the answers

    1. During an injector power balancing test, a technician discovers that one injector has failed but is getting an adequate power supply. Which of the following procedures should be performed next?

    <p>b) Continuity check between PCM and injector</p> Signup and view all the answers

    1. What is the issue when a torque converter does not multiply torque?

    <p>a) Stator is not locking to redirect fluid to the impeller.</p> Signup and view all the answers

    1. When a diesel engine misfires, it misfires at all speeds and emits a cloud of smoke. What is the primary cause of this?

    <p>a) sticking nozzle</p> Signup and view all the answers

    1. How can you determine whether the automatic leveling function of a vehicle's suspension has failed? Which method will identify the issue?

    <p>b) Install a scan tool and then check for communication among the control modules.</p> Signup and view all the answers

    1. How is a vacuum-operated brake booster tested?

    <p>a) Pump the brake pedal several times to exhaust the reserve vacuum and hold the pedal down while starting the engine.</p> Signup and view all the answers

    1. Which of the below would result in a heavy heel pattern on a hypoid gear set?

    <p>c) Backlash is excessive.</p> Signup and view all the answers

    1. What does it mean if the rev counter rapidly lowers while ascending a hill?

    <p>b) gear ratio is too high</p> Signup and view all the answers

    1. What colour are the wiring harness connections for the air bag system?

    <p>b) yellow</p> Signup and view all the answers

    1. Which of the following memory circuits stores error codes and other temporary data?

    <p>b) random access memory.</p> Signup and view all the answers

    1. What is the picture?

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

    1. What is the name for the duration each injector stays open?

    <p>c) injector pulse width.</p> Signup and view all the answers

    1. Which of the following would be the most likely cause when the top radiator hose collapses flat whenever the engine is being cooled?

    <p>a) sticking pressure cap vent valve</p> Signup and view all the answers

    1. What causes an automatic gearbox to lack reverse and engine braking in the manual first gear range?

    <p>d) Rear band has broken.</p> Signup and view all the answers

    1. What is the weight limit for carrying small weapons ammo, emergency medications, and medical equipment on a bus?

    <p>b) 500lbs</p> Signup and view all the answers

    1. Which process should be followed while changing a tie-rod end?

    <p>c) Thread tie-rod end past slot in tie-rod and adjust toe setting.</p> Signup and view all the answers

    1. How is a shortage of airflow in the air conditioning system diagnosed?

    <p>a) Inspect the cabin air filter</p> Signup and view all the answers

    1. Which of the following slings must be used to balance a load?

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

    1. What might produce low flow while measuring the efficiency of a pump under all test pressures?

    <p>d) High oil temperatures.</p> Signup and view all the answers

    1. Which of the following is a tenet of Ohm's law?

    <p>d) Voltage = amps x resistance</p> Signup and view all the answers

    1. Which of the following is the cooling fan on most transverse engine vehicles driven by?

    <p>b) electric motor</p> Signup and view all the answers

    1. Using the diagram below, which lever must be in what position to load the backhoe's bucket?

    <p>right lever in position 7.</p> Signup and view all the answers

    1. Codes for air bag storage in memory can?

    <p>a) Can be either retrieved with either a scan tool or counting flashes of the air bag light depending on the year.</p> Signup and view all the answers

    1. On two of three cylinders of a bank-fire injection system, a multi-port V6 engine is exhibiting erratic operation and a shortage of fuel. It seems that adding propane improves the idle and drive. A cylinder balancing test reveals that cylinders 1 and 5 provide little power. Additional testing indicates that there are no vacuum leaks. What causes this disorder?

    <p>b) An injector with low resistance in cylinder 3.</p> Signup and view all the answers

    1. What would be the cause if a truck's front crack seal failed repeatedly?

    <p>a) breather filter is clogged</p> Signup and view all the answers

    1. What are the minimum and maximum dimensions of a shaft with dimensions of 3.750 plus or minus 0.01?

    <p>3.740-3.760</p> Signup and view all the answers

    1. During the maintenance of a clutch with hydraulic control, which of the following must be replaced?

    <p>a) clutch fluid</p> Signup and view all the answers

    1. What does an electronic tachometer consist of?

    <p>b) receives voltage pulses from an ignition signal.</p> Signup and view all the answers

    1. What are these symbols in the diagram?

    <p>b) groove</p> Signup and view all the answers

    1. Which of the following tire wear is caused by camber?

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

    1. What should be done if a service technician exhibits signs of carbon monoxide poisoning after a day of working in a closed shop?

    <p>c) Evacuate the technician to fresh air and then check the exhaust system including the makeup air unit.</p> Signup and view all the answers

    1. The recommended ratio for replacing engine coolant with normal antifreeze is?

    <p>d) 50% water, 50% antifreeze</p> Signup and view all the answers

    1. Which of the following is the most probable reason if a gearbox may be simultaneously changed into two gears?

    <p>d) faulty interlock</p> Signup and view all the answers

    1. What is the reason for the high resistance in the alternator output circuit?

    <p>b) loose or corroded connections.</p> Signup and view all the answers

    1. Which of the following are distributor components?

    <p>c) Cap and rotor and camshaft.</p> Signup and view all the answers

    1. Which of the following will result in a restricted fuel inlet?

    <p>a) Plugged fuel tank vent.</p> Signup and view all the answers

    1. Which of the following would cause a U-joint to continually deteriorate and exhibit brinelling?

    <p>c) Insufficient driveline working angle</p> Signup and view all the answers

    1. The power window on the passenger side will only work in the down position. Which element failed?

    <p>d) Window switch.</p> Signup and view all the answers

    1. How many 10-foot lengths of 2-inch-diameter electrical metallic tube (EMT) will be needed for a distance of 115 feet between connecting points?

    <p>12</p> Signup and view all the answers

    1. Which of the following is the most likely cause of a too-short brake booster push rod?

    <p>b) excessive brake pedal travel</p> Signup and view all the answers

    1. What tests should be performed using a digital volt/ohm metre to discover the circuit fault when a newly-installed motor for a heating fan still lacks proper speed?

    <p>a) Check voltage drops in the circuit and check for current draw.</p> Signup and view all the answers

    1. When considerable oil pollution is observed in the secondary reservoir, what is the most probable cause?

    <p>a) Faulty air compressor</p> Signup and view all the answers

    1. How is air delivered to the tank trailer?

    <p>a) Pushing in the trailer air supply valve.</p> Signup and view all the answers

    1. What is a fire of class "A"?

    <p>c) ordinary combustions like wood, paper, etc</p> Signup and view all the answers

    1. Terminals intended to be used in pairs are referred to be what?

    <p>b) male and female.</p> Signup and view all the answers

    1. When repairing a faulty clutch pressure plate, should another component also be replaced?

    <p>a) clutch disk</p> Signup and view all the answers

    1. A car with an automatic transmission is not shifting properly. The first diagnostic stage would consist of?

    <p>c) Check the fluid level and type.</p> Signup and view all the answers

    1. Which of the following answers will result in rough engine operation and low output?

    <p>b) Air in the fuel system.</p> Signup and view all the answers

    1. What is the probable reason if the starter turns but the engine does not crank?

    <p>a) a bad overrunning clutch.</p> Signup and view all the answers

    1. A first aid kit should be provided for what jobs?

    <p>a) All jobs.</p> Signup and view all the answers

    1. What precautions must be taken to avoid computer damage while replacing an Electronic Control Module?

    <p>d) Wear a static strap and place a rubber mat on the seat.</p> Signup and view all the answers

    1. Which of the following pulleys rotates in the same direction as driving pulley A?

    <p>a) C and D</p> Signup and view all the answers

    1. What will happen if the computer on a fuel-injected engine does not get an RPM signal?

    <p>b) the engine will not run.</p> Signup and view all the answers

    1. What are the two varieties of electric fuel pumps?

    <p>a) in line and in tank</p> Signup and view all the answers

    1. How is this issue remedied when a whole braking system equipped with ABS has been serviced yet the pedal feels spongy?

    <p>c) The brake system must be bled while operating the hydraulic control unit using a scan tool.</p> Signup and view all the answers

    1. To avoid seal leakage, a hydraulic motor's case drain line should?

    <p>b) Run directly back to the tank</p> Signup and view all the answers

    1. A hydraulic motor circuit's cross-port relief valve's aim is to?

    <p>b) Absorb shock when the motor is first started</p> Signup and view all the answers

    1. When the starting motor fails to crank the engine or cranks it too slowly, what should be checked first?

    <p>a) battery.</p> Signup and view all the answers

    1. Thermistors are used in which parts?

    <p>b) coolant temperature sensors.</p> Signup and view all the answers

    1. Technician 1 believes the closed coil end of a valve spring should go against the cylinder head. Technician 2 believes all valve springs use shims to control free spring height. Which tech is correct?

    <p>b) tech 1</p> Signup and view all the answers

    1. Which of the following is the provided circle's area?

    <p>c) 490.60cm squared</p> Signup and view all the answers

    1. When a power rack and pinion steering system is stiff and difficult to spin, the fluid is first a dull grey colour. What repairs must be made?

    <p>b) Flush the lines and cooler, then replace the rack and the pump.</p> Signup and view all the answers

    1. How is a leak on the main side of a diesel engine fuel system detected?

    <p>b) Apply minimal pressure to fuel tank and check lines for leaks with soap and water</p> Signup and view all the answers

    1. The computer can read, but not modify, stored information.

    <p>a) ROM</p> Signup and view all the answers

    1. In relation to a transformer that has a voltage of 600V at the primary and 24V at the secondary must be replaced for temporary troubleshooting. The only available transformer 600 V primary – 20 V secondary is illustrated in the diagram below. Which is the correct tap to be used for obtaining 24 V at the secondary?

    <p>a) 20%</p> Signup and view all the answers

    1. When the wire is unplugged from the fuel gauge transmitting unit (bimetallic gauge) and a voltmeter attached to the wire displays pulsing 5v, what does this indicate?

    <p>a) properly operating IVR (instrument voltage regulator).</p> Signup and view all the answers

    1. Which component links the engine to the alternator to cause the alternator to rotate as the engine rotates?

    <p>b) v-belt</p> Signup and view all the answers

    1. How would compression be checked on a diesel engine?

    <p>c) the glow plug opening</p> Signup and view all the answers

    1. What is the issue with a single-wire alternator whose output displays 12 V and 0 A while a 100rpm engine is operating?

    <p>b) The voltage regulator is defective</p> Signup and view all the answers

    1. You discover high clearances in an oil pump after examining its clearances. How do you resolve this issue?

    <p>a) The complete pump assembly should be discarded and replace</p> Signup and view all the answers

    1. What is the correct technique for installing a new or remanufactured turbocharger?

    <p>a) Inspect air filter and pre-lubricate turbo with clean engine oil.</p> Signup and view all the answers

    1. When removing the grease gun from a fitting after lubricating the lubrication joint, you should?

    <p>c) Break by moving up, down, and sideways.</p> Signup and view all the answers

    1. All of the following statements are correct when adjusting valve lash on engines with overhead camshaft cylinder heads, except which of the following?

    <p>a) engine must be cold for all engine manufacturers</p> Signup and view all the answers

    1. How would you repair the issue if a loaded ball joint has a vertical movement of 0.130" (3.30 mm)?

    <p>c) Replace the joint, and perform a wheel alignment.</p> Signup and view all the answers

    1. In a hydraulic system, pressure is created by which of the following?

    <p>b) resistance</p> Signup and view all the answers

    1. Which of the following flare kinds is used in hydraulic braking systems?

    <p>c) Double.</p> Signup and view all the answers

    1. What is the proper way to prepare an engine hoist for lifting an engine?

    <p>c) Adjust the leg length and then adjust the lift beam length to lift the engine.</p> Signup and view all the answers

    1. Which of the following would cause a hydraulically operated automatic gearbox to shift too quickly from first to second while all other shift points are normal?

    <p>a) Spring tension at the 1-2 shift signal valve is too low.</p> Signup and view all the answers

    1. Except for the following, any of the following may cause the temperature light to stay off while the ignition switch is in the run position but the engine is not running.

    <p>d) defective sending unit.</p> Signup and view all the answers

    1. The computer uses the MAP signal to determine?

    <p>d) intake manifold pressure.</p> Signup and view all the answers

    Study Notes

    Fuel Vapour Emissions

    • Fuel vapour emissions are stored in a mechanism for controlling fuel vapour emissions.

    Electronic Control System Malfunction

    • The initial step in detecting an electronic control system malfunction is to check the basics.

    Clutch Pedal and Torque

    • When the clutch pedal is pushed while a car with a manual gearbox is moving downhill, the vehicle's torque and horsepower decrease.

    Air Brake System

    • The final adjustment method for air brakes is to test the low pressure warning signal.
    • A car with air brakes must have a low pressure warning signal.

    Air Conditioning Unit

    • To eliminate an odour from an air conditioning unit, use a method to eliminate the odour.

    Accessory Belt

    • After installing a new accessory belt, you must check the belt's tension and alignment.

    Low Pressure Warning Signal

    • The low pressure warning signal is tested by opening the rear service line valve.

    Electronic Control System

    • The initial step in detecting an electronic control system malfunction is to check the basics.

    Tractor and Air System

    • When reversing a tractor under a trailer, the whole air system must be bled.

    Heater Core and Hoses

    • When the heater core is functioning okay, one heater hose is hot to the touch and the other hose is cold.

    Radiator Coolant Level

    • When checking the radiator coolant level, the engine should be cold.

    Intake Check Valve

    • A jammed open intake check valve of a closed loop hydrostatic drive system can influence system operation by causing overheating.

    Tire Wear Pattern

    • A cupped wear pattern on a tire indicates improper tire inflation or uneven tire wear.

    Fuel Injectors

    • The fuel injectors of a paver must be bled in situations where the fuel injectors are clogged.

    Acetylene Cylinders

    • Horizontally stored or transported acetylene cylinders must be repositioned in a vertical posture for a minimum of 30 minutes.

    Air Brake System

    • A car with air brakes must have a low pressure warning signal.

    Rear Wheel Hubs

    • To remove rear wheel hubs if the axle cannot be removed, use a special tool or procedure.

    Criminal Activity and Passenger Confidence

    • To deter criminal activity and boost passenger confidence, a driver should follow safety guidelines and procedures.

    Starting Control Circuit

    • A fundamental starting control circuit powers the magnetic switch through the ignition switch and the starter solenoid.

    Hand Valve and Trailer Brakes

    • When the hand valve is engaged and the trailer brakes are being tested by opening the rear service line valve, you should hear a hissing sound.

    Air-over-Hydraulic Booster System

    • The braking force produced by an air-over-hydraulic booster system can be lessened if the air system is leaking.

    Switch and Motor

    • A switch rated in horsepower can interrupt the maximum operational overload current of a motor with the same horsepower rating as the switch at the rated voltage.

    Solenoid Windings

    • The windings of a solenoid with two coils are called dual-coil windings.

    Rope Diameter

    • For a vertical lift to sustain two tonnes, a rope diameter of at least 10mm is required.

    Knock Sensors

    • Knock sensors generate a digital signal.

    Coolant Sensor and DVOM

    • A code for a coolant sensor can be kept by a DVOM, which reveals 0 volts on the sense line circuit of the coolant temperature sensor, indicating a defective connection or an open in the sense line.

    MIG

    • MIG stands for Metal Inert Gas.

    Air Compressor

    • If the air compressor develops a leak, air loss can be prevented by a check valve.

    Class B Fire

    • A Class B fire is a fire involving flammable liquids or gases.

    Hydrostatic System

    • The hydrostatic system can cease functioning entirely if the fluid level is low or the system is clogged.

    Tachographs

    • Tachographs must be calibrated every 6 years and inspected every 12 months.

    Torque, Power, and Fuel Consumption

    • The connection between torque, power, and fuel consumption is that power is a product of torque and engine speed.

    Starting Solenoid Switch

    • An open fault in a starting solenoid switch's hold-in winding can result in the starter motor not engaging.

    Transmission and Clutch

    • The transmission shifts harshly, the input bearing is loud, and the unit has had many clutch failures, indicating a problem with the clutch or transmission.

    Bearing Installation

    • The correct way to heat a bearing before installation is to use a heat gun or oven.

    Parallel Circuit

    • A parallel circuit consists of multiple branches connected between a common voltage source.

    Spring Brakes

    • The spring brakes engage automatically when the air pressure is below a certain level.

    VAT-40 Load Tester

    • The VAT-40 load tester should be set to 1500 RPM while conducting a charging system output test.

    Watts and Horsepower

    • The connection between watts and horsepower is that 1 horsepower is equal to 746 watts.

    Fuel Gauge

    • The fuel gauge uses a potentiometer-type transmitting unit.

    Electrical Circuit

    • To pinpoint the precise location of a suspected weak connection issue in an electrical circuit, examine the circuit diagram and wiring.

    Bimetallic Gauge System

    • A faulty gauge sender cannot render all gauges inoperable inside a bimetallic gauge system.

    Grounding

    • The main purpose of grounding is to provide a safe path for electrical current to flow to the ground.

    Metal Cooling

    • As the metal cools after being sliced with a flame, it will contract.

    Emergency Brake

    • A spring brake can lawfully retain a truck or bus emergency brake in place.

    Motion and Inertia

    • Resistance to change in the motion of a vehicle is known as inertia.

    Lifting Method

    • The lowest lifting capability while using the same rope is obtained by using a single-part line system.

    Timing Chains

    • Timing chains are typically changed when the chain slack reaches 3/4 inch.

    Antifreeze Mixture

    • An antifreeze mixture will give enough winter freeze protection for a cooling system with a capacity of 9.5 litres at the lowest cost.

    Bus Safety

    • Dangerous items transported by bus must be secured properly.

    Vehicle Rear Axle

    • The correct fluid to use in a vehicle's rear axle assembly is hypoid gear oil.

    Vehicle Sales

    • Most new automobiles are sold with a warranty.

    Headlights

    • A faulty dimmer switch cannot render the low beam headlights inoperable while the high beam headlamps function normally.

    Air Bag Inflator

    • The majority of front driver-side Air Bag inflator modules consist of a stored gas generator.

    Electrical Resistance

    • When the resistance to current flow is lessened, it will result in increased current flow.

    Wiring Diagram

    • A wiring diagram employs symbols to label components.

    Crane Block

    • The crane block can be prevented from ascending by a faulty crane brake.

    Cylinder Leakage Tester

    • The piston of a cylinder leakage tester exerts air pressure to the cylinder to check for leaks.

    Air Tanks

    • The air tanks should be drained daily to remove moisture and contaminants.

    Branch-Circuit Protection

    • The branch-circuit protection for a 1, 115v, 3 hp motor would typically have 20 amps using twin element time delay fuses.

    Engine Combustion

    • When the air-fuel combination ignites before the spark plugs, this phenomenon is known as pre-ignition.

    Crane Components

    • The daily oil level check is necessary for the crane's hydraulic system.

    Engine Stroke

    • The engine's stroke is determined by the length of the connecting rod.

    Universal Joint

    • The proper process for replacing the universal joint in the middle of a two-piece driveshaft is to mark the joint's position and align it properly.

    Wheel Nuts

    • It is necessary to continuously retorque wheel nuts after short-term use to ensure proper tightening.

    Alcohol Evaporator

    • An alcohol evaporator is used for fuel system cleaning.

    Starting Motor

    • The approximate relation between the number of teeth on the starting motor pinion gear and the number of teeth on the engine flywheel is 1:10.

    Driveshaft

    • A vibration, loud crash over rough terrain, and out-of-phase driveshaft can be caused by a faulty driveshaft.

    Flashback Arrestor

    • A flashback arrestor protects the operator from a flashback while using oxy-fuel cutting and welding equipment.

    Heat-Shrinkable Tubing

    • The proper approach for repairing heat-shrinkable tubing is to use a heat gun to shrink the tubing.

    Valve Seal

    • The type of valve seal that moves up and down with the valve is a piston ring.

    Enhanced Emissions

    • When a vehicle fails enhanced emissions due to excessive nitrogen oxides (NOx), the issue is likely caused by a faulty catalytic converter.

    Instrument Panel

    • In chilly conditions, when the instrument panel sign illuminates after starting the roller, the engine should be warmed up before operating.

    Rotary Air Compressor

    • A rotary air compressor will provide low output air if the air filter is clogged or the compressor is faulty.

    Valve Replacement

    • A valve for the recirculation of exhaust gases is replaced by disconnecting the valve and installing a new one.

    Hydrostatic Motor

    • After replacing a hydrostatic motor, the system should be flushed and refilled with fluid.

    Spiral Clock Spring

    • The Spiral Clock Spring (Spiral Ribbon) in the

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    Learn about the mechanism used for controlling fuel vapour emissions by storing gasoline vapour in a specific component. Test your knowledge on emissions control in vehicles.

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