Test 1.docx

Truck & Transport Mechanic Exam Questions What should be done if the lubricant level in the differential, steering reservoir, or gearbox is very low? Add gear grease. Recommend draining and refilling with new fluid. Recommend the owner return it later for service. Fill to proper level with speci...

Truck & Transport Mechanic Exam Questions What should be done if the lubricant level in the differential, steering reservoir, or gearbox is very low? Add gear grease. Recommend draining and refilling with new fluid. Recommend the owner return it later for service. Fill to proper level with specified lubricant. What is the correct approach for measuring main bearing clearance using plastigaged? Install plastigage, lubricate journal, torque bearing cap, read clearance. Install bearing cap, torque bearing cap, rotate crankshaft, and remove plastigage. Lubricate journal, install plastigage, rotate crankshaft, read clearance. Install plastigage, torque bearing cap, remove bearing cap, read clearance. 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? a) 240/15 b) 15/240 c) 1/16 d) 16/1 Which of the following is the maximum allowable temperature for a sealed bearing? 180ºF 160ºF 212ºF 240ºF What object should never be transported with passengers on a bus? Emergency drug shipments tear gas Emergency hospital supplies Technician 1 believes engine, suspension and driveline problems may appear to be caused by the transmission or transaxle. Technician 2 believes you start with the simple inspections first to ensure that you have not overlooked something and you can use the scan tool for further clarification. Which tech is correct? tech 2 tech 1 both techs neither techs A car is being evaluated for a pulsating brake pedal. The pulse is particularly apparent at low speeds and is accompanied by a steering wheel shake. What is the difficulty? Lack of parallelism in the front rotors. Excessive caster. Out-of-round rear drums. Dynamic wheel imbalance. In addition to the air bag inflator modules, what is changed on the majority of vehicles after deployment of the air bag? Only the air bag computer only the safing (arming) sensors all sensors and computer only the impact (discrimination) sensors Which of the following is used for piston ring installation? piston press piston ring expander piston ring compressor pair of snap ring pliers Which of the following air brake system circumstances might result in a large oil discharge from the supply reservoir drain valve? governor setting too high governor setting too low restricted lubricating oil return passage in the compressor. Compressor drive belt slipping excessively. Which of the following oil pumps are often powered by the camshaft? crankshaft snout timing belt timing chain camshaft sprocket Which of the following is normally the placement of the steering wheel sensor? Base of the steering column Inside the rack and pinion gear Under the air bag On top of the rack and pinion gear How should the front trainer supports be positioned before driving? Raised 1/2 way with the crank handle removed. Fully raised with the crank handle secured in its bracket. Three turns off the top with the crank handle secured in it’s bracket Outside a magnet, magnetic flux lines emanate from which of the following? south to north. north to south. What are the five qualities of the valve listed below? Normally closed, two position, two-way, spring return, solenoid actuated Normally open, two position, two-way, spring return, hydraulically actuated Normally open, 4-way, 2 position, detent, hydraulically actuated Normally open, two-way, three position, spring return, solenoid actuated How do field effect transistors function? high input current. with a small input voltage but practically no input current. on the same principle as magnetic field devices. with a small input voltage and current. When a shift valve in an automatic gearbox that is hydraulically controlled fails to open, what is the reason of this issue? torque converter has locked up prematurely Mainline pressure has reached or surpassed maximum value Governor pressure is less than throttle pressure and spring force combined Throttle pressure is greater than governor pressure and spring force combined Using a Digital Multi-meter, a fully charged 12 volt battery should indicate how much voltage on the open circuit voltage test? 12.6 volts 6 volts per cell 9.6 volts 2 volt per cell In relation to a dash indicator warning lamp that does not light when the key is in the “on” or “start” positions, what should be the first thing you should check? bulb battery level wiring sending unit When measuring a voltage or current that is unknown, set the range selection to? the point midway between the lowest and the highest range. any point, and work downward and upward until the proper range is determined the lowest point, and work upward to the proper range. the highest point, and work downward until the proper range is determined. Which of the following spring suspension systems for trucks would be positioned above the main leaf spring assembly and would only be used under severe loads? auxiliary spring suspension coil spring suspension constant spring suspension air spring suspension What measures must be followed while changing the coil assembly in the steering column of a Supplemental Inflatable Restraint? Remove the airbag module, then the signal light switch. Lock the steering column, and disable the airbag. Lock the steering column, and remove the steering wheel. Remove the steering wheel, and disable the airbag. Which of the following tools is used to measure the proper coolant freeze protection? Hydrometer Pressure tester Thermometer Micrometer In relation to a battery's state of charge, technician 1 says a specific gravity of 1.225 at 80°F indicates that a battery's state of charge is approximately 75%, but technician 2 says you can use a hydrometer to check battery state of charge on a maintenance free battery. Which tech is correct? tech 2 tech 1 both techs neither techs Which of the following has indicated a contaminated cooling system? ATF (automatic transmission fluid) in the coolant bubbles when the radiator cap is removed pink colored coolant redish and slimy feeling coolant What must be completed prior to detaching the air ride tractor from the trailer? ensure max tractor air pressure deflate air suspension inflate air suspension place wheel chocks for tractor wheels If just one of your truck's dual braking systems indicates low tire pressure, you must? Reduce your speed and drive to the nearest garage for repairs. Continue at normal speed and find a garage before the brakes lock Stop. Safely park, and continue only after the system is fixed. Reduce your speed and test the remaining system while under way What mode does the PCM (Engine Computer) return to when the throttle is wide open? closed loop, lean mixture. open loop, rich mixture. closed loop, rich mixture. open loop with a fixed lean mixture. What is an example of a zerconia exhaust gas oxygen (02) sensor? signal generator. solenoid. potentiometer. variable resistor. Legally permitted to transport? explosives car batteries small arms ammunition labeled orm-d class 1 poison Which of the following is the most likely action to perform when performing a load test on a battery, and the technician finds that the battery voltage drops below specifications? recharge battery and return it to service recharge battery and retest it replace voltage regulator replace battery Which of the following are cylinder head bolts usually lubricated with? silicone spray engine oil SAE 80W-90 gear lube no seize compound For emergency braking when driving a double trailer and to prevent a collision, you would? Push the brake pedal as hard as you can and hold it there Use controlled or stab braking Use only the trailer brakes Which of the following scenarios benefit from the usage of endurance braking systems? flats sharpest curves ascent of long hills descent of long hills Which of the following is the most likely cause if a fuel gauge reads full? wire to sending unit grounded float stuck in the up position open fuse broken gauge Which of the following situations will cause the hydrostatic axial piston drive motor to fail completely? Restricted inlet line or filters. Overloading the motor. Runaway load over speeding the motor. Low oil levels in the reservoir. Which of the following methods should be implemented to reduce fuel consumption? using mineral oil revving the engine using lower gears engine braking Slack adjusters are? an adjusting nut on the backside of the brake drum used for adjusting the brakes. the space between the back wheels. an adjusting nut under the cab to adjust the springs. Which of the following may produce vibration in the driveline? over lubricated universal joints crossed plug wires bad engine mounts A sensor that delivers positional information, like a power seat sensor? thermodiode. thermistor. hall-effect switch. potentiometer. Water, lead, and which of the following is a common component of a battery? gas battery fluid sulphuric acid adhesion promoter Which of the following is an overhead crane wire rope that is flexible? a) 6-37 b) 6-20 c) 8-16 d) 6-8 Constantly using the brakes on a lengthy descent may lead to which of the following? brake fade wheel lock passenger being thrown backwards sagging transmission due to improper gear use Engines that use reverse cooling, pump the coolant from which of the following? radiator into the cylinder head cylinder head into the radiator engine block into the cylinder head engine block into the radiator outlet A V-type engine has how many crankshafts? 1 2 4 6 What else should be examined before replacing a control module, once all outputs and grounds have been inspected for shorts? Pinpoint tests on all outputs. All module powers and grounds. Pinpoint tests on inputs. Module programming chips. What is the mechanism that applies and releases the brakes when the brake pedal is depressed? emergency parking service The majority of the unused energy in a hydraulic system is converted into? reserve light potential heat The vacuum measurement at idle for a slow engine is 17 inches Hg (57 kPa). During a snap throttle test, vacuum falls to 8 inches Hg (27 kPa) and then recovers to 18 inches Hg (61 kPa). The vacuum measurement decreases gradually while the engine speed is maintained at 2500 rpm. What is the suggested cause? restricted exhaust system. rich fuel air mixture. stretched timing chain. burned exhaust valve. Two technicians are discussing an alternator with zero output. Technician 1 says the field circuit may have an open circuit. Technician 2 says the fusible link may be open from the battery to the alternator. Which tech is correct? tech 2 tech 1 both techs neither techs Which is right when fixing automatic transmissions? Clutch packs may be pressure tested using low pressure air. Metal contaminated coolers may be flushed and re-used. Clutch packs may be pressure tested using high pressure air. Metal contaminated torque converters may be flushed and re-used. Which of the following should a technician do prior to disassembling a parking brake with a spring? cage the spring remove the quick release valve fill the air reservoir remove the diaphragm clamp A vehicle equipped with a short arm long arm suspension is susceptible to wandering. A worn relay rod ball socket, according to technician 1. Technician 2 reports that the adjustment limit for the tie rod may be out of spec. Which technology is best? tech 2 tech 1 both techs neither techs What must be connected before backing beneath a tractor-trailer? Nothing, back up and lock the fifth wheel The electrical service cable. The emergency and service air lines When a tire vibrates at 40 to 60 kilometres per hour, the suspension is tested by bouncing the vehicle five or six times before coming to rest. What is the origin? Weak or broken spring. Weak shock absorbers. Dynamic imbalance in the tires. Cracked shock mount. The pressure gauge on a container carrying a gas would indicate a lower reading if the gas was? cooled. to expand. heated. a constant temperature. Which trailer should follow the tractor while towing several trailers? heaviest trailer lightest trailer longest trailer shortest trailer Which of the following is the most likely cause in relation to a compressor clutch that will not engage and the power and ground at the clutch coil are good? incorrect air gap bad pressure cycling switch locked-up compressor low refrigerant What should be the following test if the charging system's output is below the rated output? ground-circuit resistance. insulated-circuit resistance. alternator output (full-field test). All of the above How many seconds of gap should you maintain while driving a 100-foot tandem trailer combo at 50 miles per hour on a dry road with adequate visibility? 10 8 11 d.13 Which of the aforementioned will result in blue exhaust smoke? Leaking injector cup. Excessive valve lash. Leaking injector nozzle. Worn valve guides. How is a shuddering situation repaired during torque converter lock up? flush the auxiliary transmission cooler replace the torque converter drain and refilling the torque converter replace the shift solenoid What safety measures must be maintained while fixing data transfer cables between computers? Continuity is the only consideration. Original wire length and twist must be maintained Only the same amount of twist must be maintained The original wire length and color must be maintained Which of the following areas do most cylinder wall wear take place? at the bottom due to connecting rod loading near the top of the cylinder in the center of the cylinder depends on engine loading Which of the following will occur to the engine of a paver if it is operating without hydraulic oil? thickness control handle no longer functions. paver operations do not respond to the controls. paver's engine looses power. hydraulic oil indicator indicates a very high temperature. Except for which of these are components of Ohm's Law? watts (W) voltage (E) amperes (I) ohms (R) A computer network's communication has ceased. You identify and detach the splice pack. What steps should be performed next? Test circuit for shorts, and check for grounds on the power line. Test circuit for power with a test light, and test for grounds. Test resistance in the wire, and test for voltage present. Test circuit for continuity to ground, and test for short to power. Which of the following does NOT contribute to a loud starting motor? misalignment of the starter motor. worn bushings. damaged or worn flywheel ring gear. grounded armature. What process must be taken when installing a fuel pressure tester on a multi- port fuel injection system to achieve reliable pressure readings? Relieve the rail pressure and install and bleed the gauge. Install the gauge then relieve the pressure in the line. Remove the power fuse and bleed out air in the line. Disconnect the fuel line and install the gauge. A car with an illuminated MIL is being diagnosed. What process should be followed to determine the proper diagnostic code? Request data stream with the scan tool then check current codes. Request data stream with the scan tool then check history codes. Build the correct vehicle in the scan tool then request freeze frame data Build the correct vehicle in the scan tool then request failure records. When the driver of a vehicle equipped with a crash gearbox quickly releases the clutch while the gear lever is in neutral, he or she is practising what? poor driving technique speed shifting double declutching emergency slowdown Which of the following fluids must be monitored once the paver has been heated? Antifreeze. Hydraulic oil. Engine oil. Fuel. Which of the following prevents a rollover? Make sure that the brakes are properly adjusted Go slowly around turns. Keep the fifth wheel's free play as tight as possible Which of the following is a potential cause of cylinder rod chattering and a loud pump in a cushion-ride system? Loose connection on the pump outlet line. Accumulator charge pressure too low. Hydraulic pump pressure servo valve set too high. Loose connection on the oil inlet side of the pump. The 180 foot-pounds of torque are input at the input shaft of the transfer case. How much torque is transmitted to the driving pinion of the front axle of a four-wheel-drive car in low range (ratio of 1.8:1)? 150 pounds 162 pounds 125 pounds 178 pounds Which of the following braking methods consumes the least amount of fuel? engine air service anti locking Before backing behind a trailer, you must? Air brakes are off. Trailer brakes are locked Tractor protection valve is normal When the trailer breaks away from a combination vehicle, separating both air lines, the trailer brakes will activate and the air lines will separate. tractor protection valve to close tractor to lose all air pressure. trailer supply valve to stay open Which of the following tools can be used to check the continuity of wires that carry digital signals? logic probe voltmeter analog meter mega meter What are the two types of fuel systems for engines with spark ignition? diesel and gasoline carburetor and fuel injection LPG and alcohol None of the above What do the majority of electrical gauges rely on? battery regulated voltage alternator solenoid Which of the following is the first stage in removing refrigerant from an air conditioning system? Identify the type of refrigerant. Check the high side and low side pressures. Measure the weight of the refrigerant. Check the refrigerant oil level. During a road test, what is evaluated to certify that a diesel engine has low power? Fuel temperature and exhaust back pressure. Fuel pressure and exhaust temperature Boost and fuel pressures. Boost and crankcase pressures. Which of the following would result in a low amperage draw and a sluggish cranking speed? overcharged battery. High mechanical resistance. shorted armature High starter cable resistance. Which of the following may lead to the failure of the conveyer bearings on a paver? Lack of tension. Lack of oil. Lack of fuel lubricant on the chains. Lack of grease. Which of the following is the most likely cause in relation to an engine noise 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? Wrist pin Piston slap Main bearing Cam bearing What is the protocol for evaluating or fixing seat belt systems after a collision? Inspect belt and buckle operation, then inspect the stitching at the energy management loops. Inspect the length of the belts, and replace only the affected side. Inspect for torn belts and broken latches, then re-stitch the belt and replace the broken latches. Inspect the front seat belts first, and inspect the shoulder belt set. There is a coolant loss. Recently, coolant was supplied to a heated engine. When the engine is under stress, the exhaust emits white smoke. During a cooling system pressure test, the pressure decreases gradually, but there are no visible exterior leaks. What is the difficulty? Transmission cooler is leaking coolant into the transmission. Cylinder head gasket is leaking, pressurizing the cooling system. Cylinder head has cracked and is leaking coolant into the combustion chamber. Intake manifold is leaking into the crankcase. How can you tell if your brakes are deteriorating? You have to push harder on the brake pedal to control your speed on a downgrade Less pressure is needed on the brake pedal for each stop. Pressure on the brake pedal is released and speed increases The brake feels spongy when pressure is applied Which of the following may be used to test the functioning of brake warning systems and low air warnings? placing engine in idle qualified technician only holding the brake pedal down firmly turning on the ignition Which of the following conditions is the most likely to cause a vehicle to overheat? electric cooling fan runs all the time thermostat stuck open clogged radiator restricted heater core How should an oversize piston of 0.020 be installed? Bore the cylinder to 0.022 in (0.56 mm) to provide clearance, then hone to a suitable finish. Measure the piston, bore the cylinder to actual piston size, then hone for clearance. Subtract the clearance required, bore the cylinder to that size, and honed for clearance. Bore the cylinder 0.020 in (0.50 mm) oversize, and honed to provide a suitable finish. According to the Safety Code, which of the following is the right process for changing a hoist cable? when there are 5 broken wires in a cable lay when there are 7 broken wires in a cable lay when there are 2 broken wires in a cable lay when there are three broken wires in a cable lay Which of the following describes the force that maintains a vehicle in motion? acceleration power momentum inertia Which of the following could be the cause when a technician hears a knock or thumping at the side of the engine block that is louder when the engine is hot and goes away when the affected cylinder is shorted out? Main bearing Piston slap Wrist pin Rod bearing Which of the following are the three most important clutch pedal dimensions? pedal reserve, height, and kickback pressure pedal height, free play, and reserve pedal height, apply pressure, and free play pedal free play, reserve, and operating range Which method is proper for reviving a dead battery? Positive cable should be connected to the charged battery first. Negative cable should be connected to the dead battery first. Positive cable should be connected to the charged battery last. Negative cable should be connected to the charged battery last. When trying to remove rear brake drums, if the drums spin and move but do not come off, what must be done? Cut the brake shoe hold-down pins, and pry the drum off the backing plate. Loosen the adjusters to retract the shoes, and slip the drums off. Spray chemical penetration around the axle flange, and hammer on the drum to break it loose. Heat the axle to loosen any rust on the flange, and hammer on the drum to break it loose. The PCM or ECM monitors which of the following components to evaluate the state of the catalytic converter and will issue a DTC if it fails? Front and rear catalyst Temperature sensors Front and rear O2 (oxygen) sensors Engine coolant temperature sensor Throttle position sensor What is a simple way to validate the fuel pump relay is functioning when it is suspected to be defective? Install scan tool and then check the data stream. Remove the fuel pump relay then feel for a click. Back probe the relay terminal with a test light then cycle the key on. Test for power at the pump and then cycle the ignition key off. Which of the following would be the issue if the air brakes are operating correctly but none of the air system accessories, including the air ride seat and air starter, are operational? The air starter motor is leaking and draining the reservoir. Pressure protection valve has failed and will not open. One way check valve between compressor and tanks is leaking. Air compressor governor un-loader valve has failed The engine is not turning over. After inserting the proper test metre, you saw an abnormally high current draw and wires that appeared to leap from the battery to the starter. Why would this occur? Engine is seized or mechanically locked Resistance in the starting circuit is high. Starter has shorted hold in windings. Starter has an open field winding. A car with multi-port fuel injection will not start. What methods are employed? First confirm the complaint, and test the fuel system pressure and compare to specification. First install the scan tool, and perform a bidirectional test to fire the spark plugs. First determine there is no injector pulse or spark, and test for an open circuit at crankshaft position sensor. First test the battery voltage level, and inspect the spark wires with a high impedance digital ohmmeter. Which of the following types of solder is required to repair the instrument panel wiring? Rosin core 50/50 with acid paste flux Acid core 60/40 with no flux 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? 3 meters 4 meters 10 meters 6 meters What may happen if oil and water accumulate in the air tanks? b brakes could fail. brakes could heat up. c brakes could lock up. Typically, electrical energy is sold by which of the following? watt joule watt-hour kilowatt-hour Which of these is equivalent to double declutching? engine speed to higher gear engine speed to lower gear vehicle speed to lower engine speed vehicle speed to higher engine speed Which of the following will cause the common rail fuel system's rail pressure limiting valve to open? faulty rail pressure control valve. faulty injection nozzle. plugged injector line. plugged accumulator. When doing a flow test on a gear pump that generates 250lpm at low pressure but lowers to 150lpm at normal operating pressure, which of the following is recommended? Test circuit relief valve pressure. Replace the pump. Test main relief valve pressures. Normal pump efficiency. What is camshaft lift defined as? The time the valves stay open The distance the valves are open The time the valves stay close The height of the lobes on the camshaft. What sort of mechanism adds resistance to the rotation of the vehicle's driving wheels through the transmission? secondary braking system endurance braking system anti lock braking system safety braking system What should be done once a power steering hose has been replaced? Bleed the system by turning the steering wheel from one stop to the other Adjust the power steering belt and top up the reservoir to specifications. Re-adjust the power steering gear. Bleed the system using a pressure-bleeder. Technician 1 says an ignition misfire will increase CO and HC emissions and set a DTC (Diagnostic Trouble Code) (Diagnostic Trouble Code). Without a DTC set, a misfire induced by a lean state can increase HC and CO emissions, according to Technician 2. Which of the following technologies is correct? tech 2 tech 1 both techs neither techs A car is brought in with shifting issues, especially in first gear. Technician 1 believes that the first speed-blocking ring is to blame. Technician 2 believes the clutch may be improperly adjusted. Which technology is best? tech 2 tech 1 both techs neither techs Which of the following operating circumstances would cause the housing of a gear pump to break or the pump shaft to detach? Operation with a high pump inlet restriction. Excessive periods of very low speed operation. Over pressure operation. Over speed operation. Should you check the slack adjuster? Park on level ground, turn off parking brake and press brake pedal. Park on level ground, turn off parking brakes, pull hard on each slack adjuster. It shouldn't move more than one inch. Park on an incline and see if the vehicle rolls. Which of the provided responses will result in a bent connecting rod? Leaking liner O-rings. Hydrostatic lock. Piston to valve contact. Excessive bearing clearance. If your vehicle is equipped with twin parking control valves, you may utilised the pressure from a separate tank to? Balance the service brake system. Apply more brake pressure if the main tank is getting low Release the spring brakes to move a short distance Stay parked without using up service air pressure How can you perform an emergency stop utilising the stab braking technique with air brakes? Press hard on the brake pedal and apply full hand valve until you stop. Brake hard until the wheels lock, and then get off the brakes for as much time as the wheels were locked Pump the brake pedal rapidly and lightly. 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 What is the transmitting unit in a circuit for an oil pressure warning lamp? thermistor. variable resistor. normally closed switch. normally open switch. Technician 1 explains that, during the vacuum supply test, the vacuum supply hose is inspected for kinks. Technician 2 explains that the test entails measuring the amount of suction produced by the engine or vacuum pump. Which technology is best? tech 2 tech 1 both techs neither techs The temperature warning light is on during engine cranking because? sending unit contacts are open. prove-out (test) circuit grounds the lamp. sending unit resistance is low. sending unit contacts are close When a hydraulic cylinder has diminished lifting capability, but cycle durations and pressures are within specifications, which of the following should be done next? Cylinder leakage test. Check the pressures for the pilot control valve. Check the directional control valve for a sticky spool. Replace the pump. Complaints about a squeaky sound as the car begins to move. The frequency of the noise grows about three times quicker than its speed. What may be the issue? Worn steady bearing. Dry Cardand u-joint. Worn CV joint. Out of phase driveshaft. For gauge type or warning light systems, which of the following statements is true? When a balancing coil gauge indicates a high reading, the sending unit will have high resistance. If all warning gauges in the instrument cluster read high, the cause is a shorted ground If all warning gauges in the instrument cluster read high, the cause is a shorted fee When a balancing coil gauge indicates a high reading, the sending unit will have low resistance. Rebuilding the auxiliary part of a dual countershaft transmission. The output shaft and bearings are mounted freely. What's the next step? Install the high/low range synchronizer Install read auxiliary drive gear Time and install counter shafts Install output shaft rear bearing Which of the following is the proper adjustment sequence for a power steering box? Adjust poppets, sector shaft endplay, and input shaft preload Input shaft preload, sector shaft endplay, and adjust poppets. Sector shaft endplay, input shaft preload, and adjust poppets. Input shaft preload, adjust poppets, and sector shaft input. During oxygen sensor testing, a quality O2 sensor will have a voltage range of? 0.450 volts to 1.000 volts. 0.200 volts to.800 volts. 0.000 volts to 1.200 volts. 0.100 volts to.450 volts. Which of the following represents a 12-volt car battery? has three cells connected in parallel. has six cells connected in parallel. has six cells connected in series. has three cells connected in series. Which tech is correct during an air conditioning performance test, the technician notices that the compressor outlet is hot. Technician 1 says this is a normal condition. Technician 2 says the air conditioning system is overcharged? tech 2 tech 1 both techs neither techs Which of the following causes the engine's oil to circulate? sump to oil pump to bearings to filter filter to bearings to oil pump sump to oil pump to filter to crankshaft & bearings. What measures must be followed while inflating a wheel and tire assembly comprised of many components? Install wheel and tire assembly then inflate to specifications Install valve core and inflate to 20psi to seat the bead Install valve core and inflate tire to maximum pressure to seat bead Cage or confine the wheel and tire assembly and use a remote fill / deflate device. Which of the following must be done before opening a connection in the sensor harness of an electronic control system? Ensure the key switch is turned off. Use a high impedance digital multi-meter. Bring the system to operating temperature. Record the wiring color code. Which of the following will cause a HEUI fuel system to be difficult or impossible to start? High engine oil pressure. High engine oil level. Leaking injector oil return. Slow cranking speed Which of the following would cause a hydrostatic drive system to function in backward but not forward? Servo pistons are score Drive motor overloaded Low charge pump pressure. Pressure relief valve stuck open. What is the first step to take when a linear positioner circuit malfunctions? change the servo valve increase the pressure drive the servo valve with a battery box change the Temposonic transducer What process must be correctly followed while replacing seat anchor bolts? Remove thread sealer from threads, and install new bolts with an impact wrench. Tighten by hand to ensure the bolt is not cross threaded, and torque the correct bolts to specification. Replace all of the nuts in the floor pan, and coat the threads with a thread sealer and torque to specification. Re-thread the holes with a tap, and install metric bolts by hand Which of the following components does the turbocharger of a diesel engine link to in order to be activated? alternator. engine crankshaft. engine's exhaust manifold hydraulic pump circuit Which of the following is the concluding step when installing a torque converter on a transmission? Measure crankshaft endplay. Torque the drive/flex plate retaining bolts. Check converter run-out. Engaging the pump impeller with the shaft. You are using a lap-top computer and manufacturer software to test the Electronic Controlled Throttle circuit that has a stored DTC P1121 Electric Throttle Control Actuator. Which of the following customer concerns could be caused by a defective ECT return spring malfunction? rough idle low power detonation high idle What sort of truck spring suspension system would be installed above the primary leaf spring assembly and would only be used while carrying big loads? constant spring suspension. air spring suspension. auxiliary spring suspension. coil spring suspension. What determines the speed of a motor or hydraulic cylinder? Amount of oil flow Size of the load System pressure Directional valve center position When replacing a master cylinder, what steps must be taken to guarantee the cylinder's proper operation? Install the master cylinder, and adjust the brakes. Bench bleed the master cylinder, then install and fill the reservoir. Install the master cylinder, bleed the quick take up valve, then fill the reservoir. Transfer the proportioning valves, and install the master cylinder. What is this sort of bearing failure termed when the race or cup of a bearing that has been subjected to a shock load is dented? arcing fluting spalling brinelling What sort of gas is often used to charge a battery? nitrogen oxygen compressed air acetylene A loaded tractor trailer with tandems on both units rides and handles well. When empty, the truck has a tendency to roam. What is the intent? misaligned tractor tandems wrong caster setting wrong toe setting misaligned trailer tandems A issue with the brake pedal persists on the first application if force is kept on the pedal, but decreases with each succeeding moderate application, reaching the floor at a stoplight. What's the problem? Booster is not working. Booster valve is faulty. Wheel cylinders are leaking. Master cylinder is leaking internally. Which of the following controls the service brake? hand control foot control foot and hand control What does the 1.5 indicate in regards to the metric bolt size 7M x 1.5? bolt is 1.5mm long bolt is 1.5cm long bolt has 1.5mm between the crest of the threads bolt has 1.5mm grade strength In relation to an instrument lighting, which of the following describes the most common type of electrical wiring used? solid copper type copper stranded type aluminum stranded type twisted pair type When oil is discovered in the cooling system, how is the source of contamination determined? check for excessive water pump pressure check for excessive radiator cap pressure remove oil cooler and pressure test remove water pump and pressure test What engine running condition must be satisfied prior to a bidirectional scan tool performing a cylinder balancing test, and what does the scanner do? Engine at cold start temperature; turns off individual injectors. Engine at operating temperature; turns off individual ignition coils. Engine at cold start temperature; turns off individual ignition coils. Engine at operating temperature; turns off individual injectors. Why should you be in the correct gear before beginning a descent? you don't have to shift gears going downhill. you only have to apply the brake just hard enough to feel a definite slowdown. you can go through the gears on the way down. What precautions must be taken to avoid inadvertent deployment while removing the steering column from a vehicle with an air bag? Disconnect the DERM to disable air bag. Disconnect the multi-function switch to prevent deployment. Disable the air bag and lock the clock spring in place. Remove the air bag module first, and set it aside for safety. Which of the following actions should be taken if the yellow check engine light is illuminated? Test all circuits related to the fault. Repair the system for historical fault codes. Repair the system for active fault codes. Install a test ECM. What will occur if the spark plug wires are not installed in the correct order? engine will misfire upon starting. engine will stall upon driving. engine will backfire upon starting. vehicle will backfire upon driving. What is the abbreviation for RAM? Reverse bias amp motor. read only memory. random access memory. random only memory. In an acetylene cylinder, acetylene is stabilised by which of the following? ferond acetone water PE What is the basis for closed loop functioning in a fuel injection system? oxygen content of exhaust gases. fuel pressure. volume of intake air. All of the above A vehicle uses premium unleaded fuel which costs $1.50 per litre and the vehicle’s fuel consumption is 12 litres per 100km. Which of the following is the correct cost of fuel needed to travel 620km to the nearest dollar? a) $106 b) $112 c) $78 d) $142 Which of the following 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? Thermally Protected Ungrounded Switchboard Switch, Transfer. A car has been brought in for an Indicator Lamp Malfunction complaint. The light has been lit for three days without affecting the vehicle's drivability. PO135 is the code that is resent (O2 sensor heater circuit problem, bank 1, sensor 1). What determines the code's value? A short at the power feed terminal at the oxygen sensor heater circuit. A bad connection at the ground terminal of the oxygen sensor heater circuit. Blown fuse for the ignition feed to the power train control module. A poor voltage supply for the oxygen sensor heater at the power train control module. What causes faded or failing brakes? Over heating, low air pressure, and not relying on the engine braking effect. Not pressing the brake pedal hard enough. Not taking your foot off the accelerator pedal. Which of the following is the right procedure for adjusting excessive valve stem height? replacing the valve replacing the valve seat grinding the valve seat grinding material from valve tip Shortly after installation, if the primary pump of a hydrostatic system breaks, the failure was caused by which of the following? Externally plugged oil cooler. Excessive charge pump pressure. High pressure relief set too low. Contamination. What power is required to keep 250 pounds of block and tackle with five rope falls and little friction? 125 lbs 50 lbs 220 lbs 85 lbs Removing the ring ridge before removing the piston/rod assembly is done to prevent damage to which of the following? piston ring piston skirt cylinder block piston ring lands Which of the following should be carried out while changing a clutch? Install the transmission, then check bore alignment Measure flywheel housing depth, then face alignment. Install the pressure plate, then check friction disc alignment. Check bell housing alignment before installing clutch assembly. What does it suggest when a warning bulb does not illuminate, but does when the cable connecting the lamp to the transmitting device is grounded? sending unit is defective. warning lamp is defective. fuse is blown. there is an open circuit in the lamp wiring. If the starting armature spins, but the engine does not start, which of the following is most likely the cause? Starter drive engagement too deep. engine is seize Excessive cranking motor torque. Starter drive overrunning clutch slippage. What warning is provided before air pressure in the air tank falls below a certain level? 70psi 60psi 80psi 20psi Which of the following is the primary purpose for idling the engine prior to shutting it off? give the engine oil time to properly lubricate the turbo-compressor reduce oil pressure. reduce the turbo-compressor's speed cool the engine oil. How often should dual tires be inspected while transporting hazardous materials? 1 hour or 50 miles 3 hours or 150 miles 2 hours or 100 miles Which sensor is used to assess engine temperature? Air Temperature sensor. Throttle position sensor. Manifold absolute pressure sensor. Coolant sensor. What is the most effective and secure technique for descending a steep slope? changing to neutral and coasting down hill remaining in the same gear changing to lower gear changing to a higher gear The electrolyte of a battery is a combination of water and? Lead sulfate. Sulfuric acid Lead peroxide. None of the above How would the following effect the performance of a single overhead camshaft engine when the valve timing is delayed due to a stretched timing belt? low RPM power will be reduced power will be reduced at all engine speeds high RPM power will be reduced no change at all How should the integrity of an electrical connection be tested? For tightness, then a voltage drop should be performed across the connector Back probed and then a resistance test with an ohmmeter should be performed on the connector. Replaced and then tested for continuity. Remove and clean with a commercial cleaner and then re-installed Which of the following is the MOST likely cause in relations to a 12 volt test light is connected from the negative primary coil terminal to ground on an electronic distributor ignition (DI) system and the light flutters while cranking the engine and a spark tester does not fire when it is connected from the coil secondary wire to ground while cranking the engine? defective spark plug defective pickup coil defective ignition coil defective ignition module Which of the following is the most likely cause of a high voltage code on a two-wire temperature sensor circuit? Open sensor circuit. High resistance ground connection. Shorted sensor harness. Shorted sensor. What is the issue with a manual gearbox that is loud in all reduction speeds while under load? Cluster shaft bearings damage Clutch shaft pilot bearing is worn. First speed output gear teeth chipped Speedometer drive gear chipped What will occur if the service air line disconnects while driving a combination vehicle, but the emergency air line remains intact? Nothing is likely to happen until you try to apply the brakes The emergency tractor brakes will come on. The trailer's air tank will exhaust through the open line. Which of the following is the most important reason for keeping all valve train components together? parts wear into each other easier to measure for wear when they are a pair should always be replaced as a set should be inspected for wear Which of the following is the most significant reason to let a motor idle for three to five minutes prior to shutting it off? reduces the engine temperature. reduces the engine oil pressure. enables the filters to capture as much harmful dirt as possible. prevents condensation from forming in the engine oil. Multiple valve springs or dual springs often have? wound in opposite directions with the same number of coil turns wound the same direction with exactly same tension What is the speed limit for a 10-meter-long single-decker bus on a dual carriageway? 75kph 100kph 90kph 80kph How is the pickup coil in an electronic ignition tested? Remove coil from vehicle before testing Test the voltage with a voltmeter Test coil at 60°C Test the resistance with an ohmmeter What is the reason of a front tire that is worn on both sides, has scuffed sidewalls, and contains minute rubber dust-like particles? Tire was loaded during hard cornering. Tire was over inflate Tire has been run at low pressures. Tire was overloaded What repairs are necessary for a radiator-based cooling system leak? Affected tubes of the core should be isolated and then abandoned Radiator core should be repaired or replaced and then refilled with good quality coolant. Radiator should be flushed and then refilled with good quality coolant. Radiator should be cleaned and then repaired by crimping the leaking tube. What determines the frequency of an alternating current signal? peak value of the sine wave. amplitude of the signal being generate number of cycles per unit of time. None of the above Which of the following statements about automatic transmission maintenance is true? Clutch pack clearances must be measured before replacement. Cooler lines must be flushed before the transmission is installed Cooler lines must be flushed before the transmission is remove Clutch pack plates are lubricated with Vaseline before installing Why does the camshaft position sensor provide information to the PCM (Engine Computer)? determine the crankshaft position information for injector and spark timing. confirm that an ignition event has taken place. determine the engine RPM signal. None of the above How is a decrease in front gear accomplished from a basic planetary gear set? Sun gear must be held Ring gear must be held Carrier assembly must be the output member. Carrier assembly must be the input member. The magnetic field inside an alternator is produced by? Rotor armature. Stator Commutator How do you do a service check on the coolant? A coolant additive package should be added to restore the coolant quality before testing. Coolant should be checked for pH level using a voltmeter, for electrolytic level using an ohmmeter, and for concentration using a hydrometer. Coolant should be checked for pH level using a test strip, for electrolytic level using a voltmeter, and for concentration using a refractometer. The coolant should be drained, then the correct volume of a 50% solution installed Why should DOT 4 brake fluid be stored in an airtight container? will absorb moisture. will evaporate. will absorb air. flammable. What is the reason of an automatic transmission's low stall speed? Incorrect torque converter slipping forward clutch Freewheeling stator Faulty converter pump A single kilowatt is the same as which of the following? one hundred watts one horsepower one thousand watts one newton-metre On a hydraulic braking system, which of the following would cause the indication light to glow alongside a low pedal and weak stopping power? leak in the hydraulic system. faulty proportioning valve. faulty brake booster Air in the system.