NZ Certificate in Automotive Engineering (Light Vehicle, Level 3) Theory Assessment

Under New Zealand's Health and Safety at Work Act 2015 (HSWA), who has the primary duty to ensure, so far as is reasonably practicable, that the health and safety of workers is not put at risk?

• APersons Conducting a Business or Undertaking (PCBUs) such as the workshop employer
• BOnly the individual apprentice regardless of supervision
• CNZTA vehicle inspectors during routine WoF checks
• DVehicle owners when dropping off cars for service

Before lifting a light vehicle on a two-post hoist in a New Zealand workshop, what is the correct first step?

• AConfirm hoist capacity, inspect lift points, and position adapters on manufacturer-recomm…
• BRaise the vehicle immediately to maximum height to test hoist travel
• CPlace the hoist arms under the vehicle sills without checking the service manual
• DLift only from the front subframe regardless of vehicle design

What does an SDS (Safety Data Sheet) provide for automotive chemicals used in a New Zealand workshop?

• AHazard identification, safe handling, PPE requirements, and emergency measures for the su…
• BThe vehicle manufacturer's recommended service interval schedule
• CNZTA WoF pass/fail criteria for brake efficiency
• DCustomer invoice pricing for supplied parts and labour

When working underneath a vehicle supported on a hoist, which additional safety measure is considered best practice in New Zealand workshops?

• APosition axle stands or a mechanical safety lock as a secondary support
• BRely solely on the hydraulic hoist once the vehicle is at working height
• CPlace wheel chocks only on the side opposite the technician
• DDisable the hoist electrical supply after every individual task

A technician is about to grind a rusted exhaust component. Which PPE combination is most appropriate?

• ASafety glasses or face shield, hearing protection, and gloves suitable for hot metal
• BStandard prescription glasses and fabric gardening gloves
• CSunglasses and a disposable paper dust mask only
• DNo PPE is required if the grinder has a guard fitted

Under WorkSafe New Zealand guidance, what is the correct action when you identify a hazard that could cause serious harm in the workshop?

• AReport it to your supervisor or employer and do not proceed until the risk is controlled
• BContinue working quickly before anyone notices the hazard
• CWait until the end of the month to mention it at a team meeting
• DDocument it only if a customer complains about delays

What is the primary purpose of a spill kit in an automotive workshop?

• ATo contain and clean up oil, fuel, or coolant spills promptly and safely
• BTo store used tyres awaiting disposal
• CTo hold technicians' personal tools overnight
• DTo collect metal shavings from brake lathes only

When jump-starting a vehicle in a New Zealand workshop, what is the safest cable connection sequence?

• AConnect positive to dead battery, then positive to donor; connect negative on donor, then…
• BConnect both negative clamps directly to the dead battery terminals first
• CConnect positive and negative clamps together on the donor battery before attaching to th…
• DClamp the negative lead to the dead battery negative terminal to maximise current flow

A hybrid electric vehicle arrives for service. Before any high-voltage component work, what must a Level 3 technician ensure?

• AThe vehicle is de-energised following manufacturer isolation procedures and high-voltage…
• BStandard 12-volt battery disconnection alone is always sufficient
• CHigh-voltage orange cables may be handled with bare hands if gloves are nearby
• DAny technician may open the high-voltage battery pack without training

Under New Zealand workplace health and safety law (WorkSafe NZ / HSE Regulations 1995), what noise exposure limit must employers ensure workers are not exposed to above?

• A85 dB(A) averaged over an 8-hour period
• B60 dB(A) for any single impact noise event
• C120 dB(A) before any protection is considered
• D45 dB(A) when using air impact wrenches

Why must rags soaked with engine oil or solvent be stored in a closed metal container in a workshop?

• AThey can spontaneously combust and cause fire if left in open piles
• BThey improve workshop humidity control overnight
• CNZTA requires them for WoF brake testing records
• DThey are recycled into new engine oil by law

When using an oxy-acetylene heating torch in a workshop, what ventilation practice is essential?

• AEnsure adequate airflow to prevent accumulation of flammable gases and fumes
• BSeal all doors and windows to retain heat during winter
• CVentilation is unnecessary if a fire extinguisher is nearby
• DRun the vehicle engine indoors to assist airflow

What is the primary purpose of a torque wrench in light vehicle servicing?

• ATo tighten fasteners to the manufacturer's specified torque value
• BTo measure engine cylinder compression pressure
• CTo test alternator AC ripple voltage
• DTo determine wheel alignment toe angles

A wheel nut torque specification reads 110 N·m. If you apply 110 N·m correctly, the fastener receives:

• AA specific tightening force (moment) about the bolt axis
• BA pressure of 110 kilopascals inside the wheel rim
• CAn electrical resistance of 110 ohms across the stud
• DA fluid flow rate of 110 litres per minute

Which tool is most appropriate for checking the gap on a spark plug electrode?

• AWire-type feeler gauge
• BMicrometer measuring in millimetres to three decimal places
• CDial indicator mounted on the crankshaft
• DTyre tread depth gauge

When using a dial indicator to measure crankshaft end float, the reading shows total movement of 0.15 mm. This measurement indicates:

• AThe axial clearance (end play) of the crankshaft
• BThe tyre tread depth at the centre groove
• CThe brake disc thickness variation limit
• DThe battery state of charge percentage

What is the safest way to use an air impact wrench when final-tightening critical suspension bolts?

• AUse the impact wrench to snug fasteners, then finish with a calibrated torque wrench
• BUse only the impact wrench at maximum air pressure for final torque
• CNever use impact wrenches; only hand tools exist for suspension work
• DApply thread-locking compound instead of any tightening tool

A vernier caliper reads 28.45 mm on a brake disc thickness measurement. Why is this tool appropriate?

• AIt measures external dimensions to 0.02 mm accuracy for wear assessment
• BIt measures electrical current flow through the disc
• CIt tests brake fluid boiling point in degrees Celsius
• DIt determines wheel bearing preload in newtons

Which multimeter function should you select to measure voltage across a fully charged 12-volt battery at rest?

• ADC volts (V DC)
• BAC amps (A AC)
• CResistance (ohms)
• DFrequency (Hz)

A technician needs to remove a pressed-in ball joint. Which workshop equipment is most suitable?

• ABall joint separator (pickle fork) or dedicated ball joint press kit
• BStandard wood chisel and hammer only
• CTyre lever from a roadside kit
• DOxy-acetylene torch to melt the joint

When storing a click-type torque wrench, what practice preserves calibration?

• AWind the wrench back to its lowest scale setting to release spring tension
• BLeave it set at the highest torque value used that day
• CSubmerge the head in engine oil overnight
• DStore it on a running air compressor line

An engine oil filter wrench is selected based primarily on:

• AThe filter housing diameter and clearance around the filter
• BThe vehicle's registration plate number
• CThe colour of the engine coolant in the radiator
• DThe number of spark plugs in the cylinder head

In a four-stroke petrol engine, during which stroke are both intake and exhaust valves closed while the piston moves upward?

• ACompression stroke
• BIntake stroke
• CPower (expansion) stroke
• DExhaust stroke

A timing belt drives the camshaft in synchronisation with the crankshaft. If it breaks on an interference engine while running, what is the most likely result?

• AValve-to-piston contact causing major engine damage
• BImproved fuel economy until the next service
• CAutomatic switch to electric-only drive mode
• DIncreased engine oil pressure only

What does the term "compression ratio" describe in a petrol engine?

• AThe ratio of total cylinder volume at BDC to combustion chamber volume at TDC
• BThe ratio of fuel tank capacity to engine oil capacity
• CThe ratio of alternator output to battery capacity
• DThe ratio of tyre pressure to vehicle weight

An engine produces blue exhaust smoke at startup. This most commonly indicates:

• ABurning engine oil entering the combustion chamber
• BA rich fuel mixture with no oil involvement
• CNormal water vapour on cold NZ mornings only
• DExcess unburned diesel fuel in a petrol engine

What is the primary function of piston rings on an engine piston?

• ASeal the combustion chamber and control oil consumption on the cylinder wall
• BDrive the camshaft through a toothed belt
• CGenerate the spark for ignition
• DFilter intake air before it enters the cylinder

A naturally aspirated petrol engine in a light vehicle typically operates at a stoichiometric air-fuel ratio of approximately:

• A14.7:1 (14.7 parts air to 1 part fuel by mass)
• B1:1 (equal parts air and fuel by mass)
• C50:1 (very lean for maximum power only)
• D3:1 (very rich for cold starting always)

What component opens and closes engine valves at the correct time?

• ACamshaft and valve train (lifters, rockers, or direct actuation)
• BRadiator pressure cap
• CFuel pump in the tank
• DShock absorber on the rear axle

During a compression test, cylinder 3 reads 850 kPa while others read 1,100 kPa on a warm engine. What does this suggest?

• ALow compression in cylinder 3, possibly from worn rings, valves, or head gasket leak
• BPerfect engine condition requiring no further checks
• CExcessive alternator output on cylinder 3
• DIncorrect wheel alignment on the nearside front

What is the purpose of the engine flywheel on a manual-transmission vehicle?

• AStore rotational inertia, provide ring gear for the starter, and mount the clutch
• BCool the transmission fluid exclusively
• CMeasure exhaust gas oxygen content
• DAdjust camber angle during alignment

A turbocharger increases engine power primarily by:

• ACompressing intake air so more oxygen enters the cylinders per stroke
• BReducing exhaust back-pressure to zero always
• CReplacing the need for engine oil
• DConverting the engine to run on hydrogen fuel

On a diesel engine, glow plugs are used primarily to:

• AHeat the combustion chamber to aid cold starting
• BGenerate spark like a petrol ignition system
• CDrive the power steering pump
• DRegulate alternator voltage output

An engine oil pressure warning lamp illuminates at idle but goes out at higher RPM. A likely cause is:

• AWorn engine bearings or low oil level causing low pressure at idle
• BOver-inflated tyres on the rear axle
• CA fully charged 12-volt battery
• DCorrect wheel nut torque on all four wheels

What is the primary function of engine oil in a light vehicle?

• ALubricate moving parts, reduce friction, and help transfer heat away from components
• BProvide the main fuel source during highway cruising
• CGenerate electrical current for the ignition coil
• DReplace coolant in the radiator during summer

SAE 5W-30 engine oil. What does the "5W" indicate?

• AWinter (cold-temperature) viscosity rating
• BThe oil contains 5% water by volume
• CThe oil is rated for 5,000 km between changes only
• DThe oil weighs 5 watts when heated

The engine cooling system thermostat remains closed when the engine is cold in order to:

• AAllow the engine to reach operating temperature more quickly
• BIncrease coolant flow to the radiator immediately
• CStop the water pump from rotating
• DDisable the cabin heater permanently

A radiator pressure cap rated at 100 kPa above atmospheric pressure raises the coolant boiling point primarily by:

• AIncreasing system pressure, which raises the boiling point of the coolant
• BAdding antifreeze directly through the cap vent
• CReducing engine compression ratio
• DLowering alternator output voltage

What coolant mixture is commonly recommended for New Zealand light vehicles to balance freeze protection and heat transfer?

• A50% ethylene glycol and 50% distilled water
• B100% pure water with no additive year-round
• C100% undiluted engine oil
• DPetrol mixed 50/50 with water

An engine overheats in traffic but cools when the vehicle moves. A likely cause is:

• AFaulty radiator cooling fan or fan relay not operating at idle
• BExcessive wheel alignment toe-in only
• COver-torqued spark plugs
• DA fully discharged 12-volt accessory battery with no load

What does milky brown engine oil on the dipstick usually indicate?

• ACoolant contamination, often from a head gasket leak or cracked component
• BNormal condition after every oil change
• CExcess fuel octane rating above 98 RON
• DCorrect tyre tread depth above 3 mm

The water pump in an engine cooling system is typically driven by:

• AA belt from the crankshaft (often the same belt as alternator)
• BThe vehicle's satellite navigation system
• CHydraulic pressure from the brake master cylinder
• DAir pressure from the tyres

If an engine oil filter is installed without lubricating the seal ring with clean oil, what risk increases?

• AOil leak from improper seal seating and possible filter loosening
• BImproved fuel economy guaranteed for 10,000 km
• CAutomatic increase in compression ratio
• DPermanent disabling of the ABS system

An engine requires 4.5 litres of oil after a filter change. The technician pours 4.5 L and starts the engine without waiting. After 2 minutes, the level reads low. The most likely reason is:

• AOil filled the new filter and galleries; level must be rechecked after running and settli…
• BThe dipstick always reads low when tyres are at 200 kPa
• CCoolant displaced the oil into the radiator
• DThe alternator consumed 1 litre of oil

According to Ohm's law, if voltage is 12 V and resistance is 4 ohms, the current is:

• A3 amps (I = V ÷ R)
• B48 amps
• C0.33 amps
• D16 amps