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Understanding Polarity Quiz
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Understanding Polarity Quiz

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Questions and Answers

  1. Polarity is a term used to best describe from which of the following?

  • direction of the AC current flow.
  • b) distance between electrodes.
  • c) dangerous magnetic field caused by high voltage welding current.
  • d) direction of the DC current flow. (correct)

    1. What measures are taken when the oil pressure fluctuates?

  • a) Check the engine oil level and send out a sample for analysis
  • b) Check the engine oil level and check pressure with manual gauge (correct)
  • c) Remove the oil pan and test the oil pump and inlet assembly
  • d) Check the engine oil level then test the engine oil sensor

    1. What will cause an onboard diagnostic vehicle's malfunction indication light to flash?

  • a) Cylinder misfire (correct)
  • b) loose gas cap
  • c) indication of a pending trouble code
  • d) Vehicle is due for maintenance

    • When a valve being removed from a cylinder head starts to bind as the tip reaches the guide, which of the following should be performed?

    <p>valve tip edges should be filed</p> Signup and view all the answers

    1. If a cooling system operates at too cool an operating temperature, the engine will do which of the following?

    <p>a) Produce higher emissions</p> Signup and view all the answers

    1. Air loss in a straight truck or bus with the engine off and brakes engaged should not exceed what number?

    <p>b) 3 psi in one minute</p> Signup and view all the answers

    1. What is the most common reason of a transaxle jumping out of gear while under load?

    <p>a) shift linkage is maladjusted, worn or loose</p> Signup and view all the answers

    1. An hour of inactivity makes it difficult to start a car with port injection. A fuel pressure test reveals that the fuel pressure is normal, but drops rapidly to nothing when the engine is shut off. What causes this disorder?

    <p>a) Defective fuel pump check valve.</p> Signup and view all the answers

    1. Which of the following methods corrects a ring-and-pinion gear arrangement with excessive flank contact?

    <p>a) Move the pinion out.</p> Signup and view all the answers

    1. What may be used to repair a damaged wire and create a watertight connection?

    <p>c) crimp and seal butt splice sleeve</p> Signup and view all the answers

    1. A sensor that communicates temperature information to a body computer, such as an ambient air temperature sensor for air conditioning, is a?

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

    1. The oxygen cylinder's valves must be opened

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

    1. Which of the following would not result in a change in vent temperature when switching the thermostat from hot to cold?

    <p>d) Improper heater valve adjustment.</p> Signup and view all the answers

    1. What will happen to compressed gas in a confined space?

    <p>a) increase in temperature.</p> Signup and view all the answers

    1. After the windshield wiper switch has been switched off, which of the following cannot prevent the windshield wipers from stopping in the "park" position?

    <p>b) worn wiper motor brushes</p> Signup and view all the answers

    1. When fixing air bag systems, impact (discrimination) or safety (arming) sensors may be measured using an ohmmeter.

    <p>d) test the diagnostic resistor inside only, which is used for the computer self diagnostics.</p> Signup and view all the answers

    1. How should the crankshaft harmonic balancer be removed?dumper

    <p>a) pulling the damper hub</p> Signup and view all the answers

    1. How is an ammeter connected to a circuit for testing?

    <p>a) In series with the load</p> Signup and view all the answers

    1. It is 737 kilometres from Toronto to Ottawa. The truck driver travelled at one pace for the first 100 kilometres before increasing it by 5 kilometres per hour for the remainder of the journey. If the initial speed was 90 kilometres per hour, what would be the entire journey time in hours?

    <p>b) 7.82 hrs</p> Signup and view all the answers

    1. How frequently should the air tanks on a vehicle that is driven on the highway be drained?

    <p>b) At the end of each day.</p> Signup and view all the answers

    1. What effect would a leaky motor check valve have on the performance of a reversible gear motor?

    <p>a) motor will have reduced torque and speed in one direction.</p> Signup and view all the answers

    1. Standard hardware and prepackaged bearings?

    <p>c) Are serviced with the same tools and fittings.</p> Signup and view all the answers

    1. On the drawing below, which of the following is this component on an ignition system?motor

    <p>d) starter motor</p> Signup and view all the answers

    1. Typically, the piston ring end gap is around 0.004 inch?

    <p>c) per 1.0in of the bore size</p> Signup and view all the answers

    1. During a driving test after the installation of new brake linings, what do you check for?hard

    <p>c) hard pedal and straight line stop</p> Signup and view all the answers

    1. A vehicle is equipped with a Malfunction Indicator Lamp (MIL). The light has been glowing for the previous four days without affecting the vehicle's drivability. What diagnostic actions must be performed after installing a scan tool?

    <p>c) Check the freeze frame data then check failure records.</p> Signup and view all the answers

    1. Which of the following are the right procedures for charging a battery?

    <p>d) Relieve the hydraulic pressure and charge to accumulator specification.</p> Signup and view all the answers

    1. What occurs when the resistance of the coolant temperature sensor (ECT) falls below 1000 ohms?eaner

    <p>b) the mixture gets leaner.</p> Signup and view all the answers

    1. Force as a vector has which of the following characteristics?magnitude

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

    1. In relation to radiator cores, they are made from sheet brass or which of the following?

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

    1. A vehicle passed the pressure test but failed the evaporative purge flow test during an improved I/M test. There were no Diagnostic Trouble Codes registered. While driving with the throttle wide open, the scan tool shows that the evaporative emissions control solenoid has been activated. What caused the test failure?

    <p>a) Blocked vacuum port to solenoid</p> Signup and view all the answers

    1. You are doing maintenance on a trailing arm suspension with coil-over shocks. What steps are required to replace the shocks?

    <p>d) Support the rear axle, and replace the shocks.</p> Signup and view all the answers

    1. What signals may be used to alert drivers that a stopped vehicle has explosives?

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

    1. What is the most dependable sign that a variable displacement hydraulic pump is malfunctioning?drain flow

    <p>d) Excessive case drain flow</p> Signup and view all the answers

    1. Where may the coolant flow from on a leaking water pump?

    <p>b) water pump weep hole</p> Signup and view all the answers

    1. The function of the fuel vapour return line is to return any vapour to the fuel tank.

    <p>d) develops in the fuel pump</p> Signup and view all the answers

    1. When the car is started, the Air Bag Warning bulb will?

    <p>b) Flashes for up to six seconds for self-diagnostics, then will go out.</p> Signup and view all the answers

    1. How does a light-out warning system determine when a lamp has burnt out?

    <p>c) a voltage drop across a resistor.</p> Signup and view all the answers

    1. How must a Weather Pack connection be repaired?

    <p>a) Remove the primary lock then locate the entry canal and release the terminal with the appropriate tool.</p> Signup and view all the answers

    1. Engine oil leaks are usually located by adding fluorescent dye to the oil and checking with which of the following?

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

    1. During an alternator output test, the output is determined to be zero amps and the voltage to be 12 volts. The next step should be?

    <p>b) full-field (Alternator output test) the alternator and check the readings.</p> Signup and view all the answers

    1. What is the reason for an O2 sensor's constant output of 0.2 volts?winding

    <p>b) open winding in an injector.</p> Signup and view all the answers

    1. In relation to a series circuit, which of the following is correct?

    <p>a) highest resistance has highest voltage drop</p> Signup and view all the answers

    1. Which solder is most suitable for electrical connections and bunch tinning of stranded conductors?

    <p>resin core</p> Signup and view all the answers

    1. Which of the following would cause a flapping sound near the front of the engine?

    <p>b) timing belt tension too loose</p> Signup and view all the answers

    1. Which of the following can fix a cylinder wall that is scored or fractured on a cast iron block

    <p>b) installing a dry cylinder sleeve</p> Signup and view all the answers

    1. Maximum leakage rates are?

    <p>a) Less than two psi in one minute for single vehicles and less than three psi in one minute for combination vehicles.</p> Signup and view all the answers

    1. Installing a master oil pressure gauge exposes a low oil pressure at idle and a lower-than-anticipated oil pressure at 2500 rpm. What is the difficulty?bearings

    <p>b) There is significant wear in the engine bearings.</p> Signup and view all the answers

    1. Who activates Powershift P.T.O.s?

    <p>b) Electric over air.</p> Signup and view all the answers

    1. Which of the following would cause an engine to run at a temperature that is too high?

    <p>c) Slipping water pump belt.</p> Signup and view all the answers

    1. Which of the following is the primary function of anti-lock brakes?

    <p>b) prevents wheels from locking</p> Signup and view all the answers

    1. Which of the following knots is used to affix two lines of the same diameter together so that they do not slip?

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

    1. When approaching a railroad crossing, the bus must halt between? and?

    <p>a) 15 and 50 feet before a railroad crossing</p> Signup and view all the answers

    1. Which of the following should be sprayed with Ether fluid during pressured fluid startup?

    <p>b) air intake system.</p> Signup and view all the answers

    1. How are restricted slip differentials identified?

    <p>d) Checking manual for specifications.</p> Signup and view all the answers

    The safest and most effective method for using a wrench is by?

    <p>a) pulling towards you</p> Signup and view all the answers

    1. Which of the steps below would a technician take to adjust bearing endplay on a transfer case?

    <p>c) Measure endplay with a dial indicator and calculate shim pack.</p> Signup and view all the answers

    1. All of the following are reasons why you must disable the fuel injection system and ignition system when conducting an engine compression test, except for which of the following?

    <p>a) prevents inaccurate readings</p> Signup and view all the answers

    1. What must cars with air brakes be equipped with?

    <p>d) A supply pressure gauge</p> Signup and view all the answers

    1. How many crankshaft rotations will a four-stroke engine undergo?

    <p>a) every two revolutions</p> Signup and view all the answers

    1. What is the proper sequence for beginning system testing? starter draw.

    <p>b) Perform a battery test then test starter draw.</p> Signup and view all the answers

    1. After installing a replacement bearing, what should be done to test bearing clearance during final assembly?

    <p>c) Install replacement bearings and use a Plastigauge to measure the installed clearance.</p> Signup and view all the answers

    1. Inadequate lubrication of wheel bearings will result in?

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

    1. Which of the following hydraulic system testing processes takes viscosity into account?

    <p>d) Warming the hydraulic fluid to operating temperature.</p> Signup and view all the answers

    1. When is a placard necessary for a flammable liquid?

    <p>c) more than 110 gallons</p> Signup and view all the answers

    1. Which of the following does the flywheel of an internal combustion engine maintain the smooth rotary motion?

    <p>d) crank shaft</p> Signup and view all the answers

    1. Technician 1 says when the condenser airflow is restricted the pressure is high in both high and low lines. Technician 2 says an indication of low refrigerant is when both the high and low sides show low pressure. Which tech is correct?

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

    1. If the multiple-disc holding clutch in an automatic gearbox fails, which statement is true?

    <p>a) One member of a planetary gear set will not lock to the transmission case.</p> Signup and view all the answers

    1. Which of the following would reduce the heater core's output?

    <p>b) Low coolant level.</p> Signup and view all the answers

    1. Which of the following is a benefit of ceramic metal halide lamps in comparison to regular metal halide lamps?

    <p>c) More lumens per watt</p> Signup and view all the answers

    1. How many amps must the feeder carrying two 1-1/2 horsepower, 230-volt, single-phase motors have a load current rating of?

    <p>22.5</p> Signup and view all the answers

    1. You diagnose a car with a complaint of not starting. With an injector test light, an injector pulse is visible, but there is no spark at any ignition coil. Which element has failed?

    <p>b) Ignition control module.</p> Signup and view all the answers

    1. The engine coolant temperature sensor has a resistance of 100,000 ohms at -40°C and just 70 ohms at 130°What does this signifier

    <p>a) Sensor is functioning normally within its design limits.</p> Signup and view all the answers

    1. If a condenser fan were inoperative, what high-side and low-side pressure gauge readings would a technician find?

    <p>c) both high-side high and low-side are high</p> Signup and view all the answers

    1. When the ride height of a car is too low, explains technician 1, the vehicle may pull to the side. Technician 2 asserts that ride height has no impact on front camber. Which technology is best?

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

    1. Typically, valve springs are inspected for squareness, free height, and which of the following characteristics?

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

    1. Which of the following is controlled by braking systems or retarders designed for endurance?

    <p>b) without using the wheel mounted brakes</p> Signup and view all the answers

    1. Which of the following safety precautions should be performed while bleeding the brakes on an air over hydraulic system?

    <p>a) Block the wheels and reduce reservoir air pressure.</p> Signup and view all the answers

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

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

    1. What will occur if the timing belt breaks on an overhead camshaft engine with free wheeling camshafts?

    <p>a) engine will quit</p> Signup and view all the answers

    1. How should the frame and suspension be repaired?

    <p>d) Steering linkage adjustment can compensate for minor frame sway.</p> Signup and view all the answers

    1. Reducing an engine's compression ratio decreases combustion temperature and what else?

    <p>d) Reduces the amount of NOx found</p> Signup and view all the answers

    1. What sort of fuel-powered engines are often the most fuel-efficient?

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

    1. The alternator brush is supported by a?

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

    1. Which of the following is the freezing and boiling point of engine coolant measured with?

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

    1. The engine is functioning at the right temperature, the lines to and from the heater core are hot, yet the car lacks heat. What is the source of the issue?

    <p>a) Temperature blend door malfunction.</p> Signup and view all the answers

    1. Which of the following processes prevents the SCR system from freezing in low-temperature environments?

    <p>d) Repair the temperature sensing circuit in the DEF (Urea) reservoir.</p> Signup and view all the answers

    1. Which of the following must be performed in order to install piston rings?

    <p>a) Stagger the ring gaps.</p> Signup and view all the answers

    1. What causes recurring U-joint failure at low mileage?

    <p>b) High speed, high angle operation</p> Signup and view all the answers

    1. At 80 degrees Fahrenheit, a specific gravity between 1.170 and 1.190 suggests that a battery's level of charge is approximately?

    <p>0.5</p> Signup and view all the answers

    1. What do the mass air flow sensors utilised by the PCM (Engine Computer) measure?

    <p>a) air density and volume.</p> Signup and view all the answers

    1. Torque is converted by the transmission system into which of the following?

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

    1. Which of the following most accurately describes M8 metric bolts?

    <p>b) bolt is 8mm in diameter</p> Signup and view all the answers

    1. When the air conditioning system begins functioning regularly, the vent temperature gradually begins to rise. Which of the following is the most significant issue?

    <p>b) Thermostatic switch stuck close</p> Signup and view all the answers

    1. How should the oxygen sensor voltage respond to a vacuum leak?

    <p>d) momentarily drop between .100 - .400 volts.</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. An engine with a significant connecting rod bearing failure. What modifications are made to the oil cooler during engine overhaul?

    <p>a) Replace core assembly</p> Signup and view all the answers

    1. When the bore of an engine is enlarged, the displacement will rise, and the compression rate will do which of the following?

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

    1. The pressure gun?

    <p>c) Should not be used on pre-packed bearings.</p> Signup and view all the answers

    1. Which is more susceptible to tipping over when vehicles carrying trailers experience the crack the whip effect?

    <p>b) The rear trailer of a triple</p> Signup and view all the answers

    1. Which of the following is the proper method for doing circuit inspections on a computer-controlled engine?

    <p>c) Test voltage and resistance using a high input impedance digital meter.</p> Signup and view all the answers

    1. Which of the following is the right approach for testing the governor of a compressor?

    <p>b) Bleed down air and record cut-in pressure, then build-up air and record cut- out pressure.</p> Signup and view all the answers

    1. Which of the following is the given circle's radius?

    <p>a) 12.5cm</p> Signup and view all the answers

    1. Which of the following would cause the steering wheel on an articulating steering system to revolve by itself?

    <p>a) Internal wear in the metering pump.</p> Signup and view all the answers

    1. What is a hot-wire mass air sensor used for?

    <p>a) molecular mass of air entering the engine.</p> Signup and view all the answers

    1. Which of the following is the right method for replacing a vehicle's hydraulically released, spring-applied park-brake actuator?

    <p>c) Relieve the hydraulic pressure and confine the spring.</p> Signup and view all the answers

    1. If a vehicle lacks power, you will also notice an odour emanating from underneath the vehicle and an orange-lit catalytic converter. What is the difficulty?

    <p>c) Disconnected spark plug wire.</p> Signup and view all the answers

    1. When is the manual valve to be used?

    <p>a) To test the trailer brakes.</p> Signup and view all the answers

    1. Which of the following is controlled by the oil pump relief valve?

    <p>d) maximum oil pressure</p> Signup and view all the answers

    1. Voltage can be described best as which of the following?

    <p>b) an electromotive force.</p> Signup and view all the answers

    1. What must be done while rigging using a swivel Eyebolt?

    <p>b) Ensure it is torqued correctly</p> Signup and view all the answers

    1. When the switch is triggered, the danger lights do not flash, but the signal lights function correctly. The identical light bulb is utilised in both circuits of this lighting system, therefore what may be causing this failure?

    <p>b) Faulty hazard flasher.</p> Signup and view all the answers

    1. When codes are cleared or the battery is unplugged, a drive cycle should be conducted. What is the required method for completing the driving cycle?

    <p>c) Look up the unique drive cycle for the vehicle then road test and complete the trip as outlined in the information.</p> Signup and view all the answers

    1. How can battery rust be removed?

    <p>c) solution of baking soda and water.</p> Signup and view all the answers

    1. Which of the following is the least likely cause of a dim headlight?

    <p>b) low alternator output</p> Signup and view all the answers

    1. When the brake pedal (stop light switch) is pushed, the fuse blows. Technician A asserts that a short circuit exists before the switch and that a short finder is necessary. Technician B asserts that the short circuit is complete when the switch is closed and that it must be located after the switch. Who is right?

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

    1. The TPS (Throttle Position Sensor) input is utilised to perform anything except the following.

    <p>a) determine idle speed RPM.</p> Signup and view all the answers

    1. Which of the following conditions on an air brake system could cause high discharge of oil from the supply reservoir drain valve?

    <p>d) restricted lubricating oil return passage in the compressor</p> Signup and view all the answers

    1. In relation to a Digital Multi-meter being used to measure DC voltage and is connected in parallel to the load device, which of the following defines the reading?

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

    1. Low compression in two adjacent cylinders is often caused by which of the following?

    <p>a) leaking head gasket</p> Signup and view all the answers

    1. What two things must be noticed while testing the reaction of the fuel control system by causing a vacuum leak?

    <p>voltage drop in O2 sensor output and an increase in injector dwell.</p> Signup and view all the answers

    1. What is the name of the sensor that delivers speed information, such as a wheel speed sensor?

    <p>c) Magnetic pulse generator.</p> Signup and view all the answers

    1. Which of the following holds the compressed air used in an air brake system?

    <p>d) reservoir tanks</p> Signup and view all the answers

    1. How is the charging system's warning bulb activated?

    <p>d) difference in voltage.</p> Signup and view all the answers

    1. Which of the following would be the most probable reason why a driver abruptly loses control of a vehicle?

    <p>a) front wheel blow out</p> Signup and view all the answers

    1. When should a ground-wire clamp be fitted on a prefabricated service mast?

    <p>b) a mast of 10 ft with PVC conduit – between the mast and the meter socket.</p> Signup and view all the answers

    1. What is the right adjustment sequence for a carrier rear-axle final drive component that is removable?

    <p>d) Pinion bearing preload, and pinion depth.</p> Signup and view all the answers

    1. Which of the following is utilised to test the circuit's load?

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

    1. What is the right installation technique for a tire and wheel assembly?

    <p>d) Tighten the lug nuts in a specific pattern, and torque them to specs in the same pattern.</p> Signup and view all the answers

    1. In respect to turbochargers that employ boost pressure to signal proper functioning, what units are used to quantify boost in the English System of Measurement?

    <p>d) Pounds per square inch (psi)</p> Signup and view all the answers

    1. What is this graphic?

    <p>d) Fillet weld contoured with a grinder</p> Signup and view all the answers

    1. What is the right sequence of adjustments when repairing a power steering box with reciprocating balls?

    <p>a) Worm-bearing pre-load, and over-center adjustment.</p> Signup and view all the answers

    1. What is the primary function of the starter's overrunning clutch?

    <p>d) disengage the armature when the engine starts.</p> Signup and view all the answers

    1. Which of the following forms of roller wear will occur while compacting gravel along a curb with a cylinder that is no wider than the tires?

    <p>c) premature wear of the tire walls.</p> Signup and view all the answers

    1. Which of the following claims about the gear assembly below is true

    <p>b) gear A without the handle rotates in the opposite direction as gear B with the handle</p> Signup and view all the answers

    1. Which of the following will require an OFF-vehicle repair in relation to an electronically controlled 4-speed automatic transaxle and you notice a shock when shifting from N to D?

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

    the magnetic field necessary for motor starting must be supplied by?

    <p>a) field-winding assembly.</p> Signup and view all the answers

    1. Which of these does not generate a digital signal?

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

    1. Which of these sensors detects engine load directly?

    <p>b) Manifold absolute pressure sensor.</p> Signup and view all the answers

    1. What might cause choppy engine idle and stalling in the EGR system?

    <p>d) any of the above</p> Signup and view all the answers

    1. What does a dual air brake system consist of?

    <p>b) A two brake system, one operates the front brakes and one operates the back brakes.</p> Signup and view all the answers

    which of the following may cause clutch slippage?

    <p>b) leaking rear main seal</p> Signup and view all the answers

    1. What does "TIG" stand for?

    <p>d) tungsten-inert gas</p> Signup and view all the answers

    1. What should a driver do while descending a long, steep hill?

    <p>d) Release the brake when you are 5 M.P.H. below your</p> Signup and view all the answers

    1. Which of the following is used to modify the height of the valve spring?

    <p>a) installing valve spring inserts</p> Signup and view all the answers

    1. According to the safety code, which of the following is the minimum approach distance between a 100,000-volt electric line and a distribution mast?

    <p>a) 3 meters</p> Signup and view all the answers

    1. What should be inspected if a warning bulb operates when the ground circuit is bypassed using a jumper wire?

    <p>c) open ground circuit.</p> Signup and view all the answers

    1. What should be done if a water pump leak is discovered during the pressure testing of a cooling system?

    <p>c) Drain the system, remove the pump drive belt and the timing belt if required, replace the water pump, refill and bleed the system.</p> Signup and view all the answers

    1. If a lower gear is engaged when going down a very steep hill, which of the following is reduced?

    <p>d) overheating the brakes</p> Signup and view all the answers

    1. Commercial bus drivers are required to have a CDL if they operate a?

    <p>a) vehicle that is designed to carry more than fifteen (15) passengers including the driver.</p> Signup and view all the answers

    1. The branch circuit conductor supplying a 3/4 hp, 1Ø 115 volt motor shall have an ampacity of which of the following?

    <p>a) 17.25 amps</p> Signup and view all the answers

    1. What are some other terms for controlled braking?

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

    1. Where does the electrical current travel when you flip the key?

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

    1. Why is it crucial to be aware of the liquids stockout?

    <p>c) Some liquids expand more than others when they get warm</p> Signup and view all the answers

    1. When checking the output signal of an A/C signal generator, which of the following would indicate a satisfactory signal?

    <p>a) The peaks should be even all the way across the wave form and they should the same height both positive and negative.</p> Signup and view all the answers

    1. Which change is most likely to repair a car in park that rolls continuously?

    <p>b) Gear shift linkage</p> Signup and view all the answers

    1. After removing an injector, what action is taken if engine oil is discovered to be diluted with fuel?

    <p>a) pressure test fuel gallery and check for leaks</p> Signup and view all the answers

    1. How many amps would be the maximum motor-running overload protection for a 3 horsepower, 1 230V motor?

    <p>a) 22.1</p> Signup and view all the answers

    1. What may occur if a vehicle hauling excess excavation material throws its full load into the hole?

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

    1. This is accurate for fixing or maintaining an air conditioning system, correct?

    <p>d) A/C systems are evacuated to remove moisture and air from the system.</p> Signup and view all the answers

    1. Which of the following size dual-element fuse does the Code require for a 2 hp, 208 volt, single-phase motor?

    <p>b) 20 amp</p> Signup and view all the answers

    1. What is the primary issue while removing brake callipers to replace disc brake pads in order to safeguard the ABS hydraulic control unit?

    <p>b) Open the bleeder, push the piston back, close the bleeder, and remove the caliper and the disc pads.</p> Signup and view all the answers

    1. A trailer equipped with electric brakes is being evaluated for inadequate brake application under load. The technician has properly adjusted the controller's gain and verified that power is available at the trailer's wheels. How should the technician discover the source of the issue?

    <p>d) Measure the current flow in the brake circuit to each wheel to verify the connections are secure.</p> Signup and view all the answers

    1. A trailer equipped with electronic brakes is being evaluated for inadequate brake application under load. The technician has properly adjusted the controller's gain and verified that power is available to the trailer's wheels. How should the technician discover the source of the issue?

    <p>d) Measure the current flow in the brake circuit to each wheel to verify the connections are secure.</p> Signup and view all the answers

    1. Which of the following will cause the retarder of an automatic gearbox to work poorly and create excessive heat?

    <p>b) torque converter lock-up clutch is slipping.</p> Signup and view all the answers

    1. Using which of the following will avoid damage to the crankshaft rod journal during piston/rod installation?

    <p>c) rod bolt protectors</p> Signup and view all the answers

    1. What function does volatile RAM serve?

    <p>b) memory scratch pad for diagnostic capabilities.</p> Signup and view all the answers

    1. A car with traction control and electronic stability control is undergoing replacement of the front brake rotors and brake pads. Technician 1 suggests

    recalibration of the yaw rate and deceleration sensor. Technician 2 suggests indexing the new rotors to the hub using a dial indication to minimise run-out. Which technology is best?

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

    1. How many lines are there on the head of an 8UNF cap screw?

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

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

    <p>a) mechanically support any structure attached to the cylinder</p> Signup and view all the answers

    1. The low side pressure of a CCFOT air conditioning system is 26 psi, whereas the high side pressure is 210 psi. The temperature of the air discharged from the vent is 14 degrees Celsius. What difficulty does the air conditioning system have?

    <p>d) Temperature blend control door malfunction.</p> Signup and view all the answers

    1. After rebuilding the torque converter of an automatic gearbox, what is the final inspection?

    <p>d) Leak test</p> Signup and view all the answers

    1. What is the next step when a starting current draw test reveals a lower cranking speed and current than specified?

    <p>d) run a voltage drop test of B+ and ground cables.</p> Signup and view all the answers

    1. Where may an engine vacuum diagram be located?

    <p>b) Service manual.</p> Signup and view all the answers

    1. Which of the following components are parts of the disc brakes?

    <p>b) brake pads and rotor</p> Signup and view all the answers

    1. On air cooled engines, which of the following is the main function of the cooling fins?

    <p>d) dissipates the engine heat</p> Signup and view all the answers

    1. In relation to a manual air conditioning system without automatic control, the compressor clutch will not operate. Technician 1 says there is a failed compressor thermal protector. Technician 2 says there is an incorrectly adjusted temperature door. Which tech is correct?

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

    1. Which of the following is the primary function of the data collected from the engine-hour metre at the conclusion of each day?

    <p>b) provides better follow-up for equipment maintenance.</p> Signup and view all the answers

    1. A device that automatically or manually transfers one or more load conductor connections from one power source to another is known as?

    <p>d) Switch, Transfer.</p> Signup and view all the answers

    1. Excessive and persistent black smoke as well as a diesel engine's loss of power suggest which of the following?

    <p>d) poor air intake.</p> Signup and view all the answers

    1. Slip-limit differentials?

    <p>d) Are serviced the same as any other differential.</p> Signup and view all the answers

    1. Why must water be drained from the air tanks?

    <p>d) Water can freeze in cold weather and cause brake failure</p> Signup and view all the answers

    1. When all cable diameters are identical, which of the following slings has the lowest lifting capacity?

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

    1. A vehicle's Malfunction Indicator Lamp is lit. A P0133 code O2 sensor circuit delayed response is present. What test approach would validate a delayed reaction time when monitoring the O2 sensor?

    <p>b) Create a lean condition then a rich condition and monitor response time.</p> Signup and view all the answers

    1. Voltage drop measurements on the starting circuit are performed to locate?

    <p>d) high resistance.</p> Signup and view all the answers

    1. What is the most probable reason of a transfer case that will not shift from low gear ratio to direct drive or 1:1 ratio?

    <p>a) broken shift shaft</p> Signup and view all the answers

    1. How frequently should the air tanks on a vehicle that is driven on the highway be drained?

    <p>b) At the end of each day.</p> Signup and view all the answers

    1. The safety catch for the fifth-wheel locking lever must be? for a connection to be complete.

    <p>c) Over the locking lever</p> Signup and view all the answers

    1. When the brake is applied after a remote start on a remote starting system, what prevents the engine from turning off?

    <p>b) Defective stop lamp switch</p> Signup and view all the answers

    1. How are the batteries linked using jumper cables when a backup battery is present?

    <p>d) connecting the same-polarity terminals of the two batteries.</p> Signup and view all the answers

    1. In relation to a vehicle PCM requiring programming to resolve a transmission shift problem listed in a service bulletin, technician 1 thinks reprogramming consists of downloading new calibration files from a scan tool, personal computer or modem into the PCM's electronically erasable programmable read-only memory (EEPROM) (EEPROM). Technician 2 believes reprogramming is not an OBD-II requirement but that many vehicles will need a new PCM in the event software changes become necessary. Which tech is correct?

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

    1. How do you fix an electronically controlled automatic transmission that refuses to move into second gear?

    <p>b) Follow the correct diagnostic procedure using hydraulic diagrams.</p> Signup and view all the answers

    1. What do conductors of fibre optic devices do?

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

    1. To what purpose must fittings and plugs be cleaned of dirt?

    <p>b) Prevent foreign materials from entering bearing.</p> Signup and view all the answers

    1. What may occur if a vehicle hauling excess excavation material throws its full load into the hole?

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

    1. How should the horn pad be oriented when the steering wheel pad is safely removed during a repair?

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

    1. Which of the following is the maximum size overload relay permitted for protection against overload for a 1Ø, 2 hp, 208 volt motor?

    <p>17.16</p> Signup and view all the answers

    1. When using a Digital Multi-meter voltmeter function to check for a voltage drop, metre leads should be connected in which of the following ways?

    <p>c) across the component or circuit</p> Signup and view all the answers

    1. Which portion of the kingpin should the jaws latch onto?

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

    Study Notes

    Polarity and Electrical Systems

    • Polarity is a term used to describe the direction of a magnetic or electrical field.

    Engine Performance and Diagnostics

    • An onboard diagnostic vehicle's malfunction indication light will flash when a valve is removed from a cylinder head and starts to bind as the tip reaches the guide.
    • If a cooling system operates at too cool an operating temperature, the engine will do which of the following?
    • An hour of inactivity makes it difficult to start a car with port injection.
    • A fuel pressure test reveals that the fuel pressure is normal, but drops rapidly to nothing when the engine is shut off due to a fuel system disorder.

    Transmission and Drivetrain

    • The most common reason of a transaxle jumping out of gear while under load is due to malfunctioning of the transaxle.

    Braking Systems

    • Air loss in a straight truck or bus with the engine off and brakes engaged should not exceed a certain number.
    • Maximum leakage rates are a set standard.

    Cooling Systems

    • If the coolant flow from on a leaking water pump, it may cause engine damage.
    • The function of the fuel vapour return line is to return any vapour to the fuel tank.

    Electrical Systems and Sensors

    • A sensor that communicates temperature information to a body computer, such as an ambient air temperature sensor for air conditioning, is a type of sensor.
    • The oxygen cylinder's valves must be opened in a specific way.
    • When fixing air bag systems, impact (discrimination) or safety (arming) sensors may be measured using an ohmmeter.

    Battery and Charging Systems

    • The safest and most effective method for using a wrench is by using proper techniques.
    • When charging a battery, certain procedures must be followed.

    Safety Precautions and Procedures

    • When approaching a railroad crossing, the bus must halt between certain points.
    • In relation to radiator cores, they are made from sheet brass or other materials.
    • A Weather Pack connection must be repaired in a specific way.

    General Knowledge

    • The primary function of anti-lock brakes is to prevent wheel lockup.
    • Which of the following knots is used to affix two lines of the same diameter together so that they do not slip?
    • The engine coolant temperature sensor has a resistance of 100,000 ohms at -40°C and just 70 ohms at 130°C.

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    Test your knowledge on how polarity is described with this quiz question. Choose from the options provided to see if you know the correct answer.

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