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NABTEB Light Vehicle Body Repair study materials
NABTEB Light Vehicle Body Repair study resources

NABTEB Light Vehicle Body Repair practice questions

One question at a time. Build your NABTEB Light Vehicle Body Repair understanding.

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Question 1Workshop Safety, Tools and Equipment

Before raising a vehicle on a two-post hoist, where should the lifting pads be positioned?

  1. Under the front bumper cross member
  2. Under the plastic sill covers at the door openings
  3. Under the manufacturer's designated lift points on the chassis Correct answer.
  4. Under the centre of the floor pan between the axles

Explanation

Vehicle makers specify reinforced jacking and hoist points that can carry the vehicle's weight without deforming panels. Placing pads anywhere else risks crushing sills, floor pans or bumpers and can let the vehicle slip off the hoist. Always check the handbook or the stamped marks on the underside before lifting.

Question 2Workshop Safety, Tools and Equipment

A technician is about to MIG weld a painted quarter panel. Which personal protective item is essential for the eyes?

  1. A welding helmet with the correct shade lens Correct answer.
  2. Tinted sunglasses
  3. A full-face dust mask
  4. Clear safety spectacles only

Explanation

MIG welding produces intense ultraviolet and infrared radiation plus flying spatter, so a helmet with an appropriate shade lens is required to protect the eyes and face. Clear spectacles do not filter the arc radiation and can allow arc eye. A dust mask protects the lungs, not the eyes.

Question 3Workshop Safety, Tools and Equipment

What is the main purpose of a fume extraction unit used during body refinishing?

  1. To reduce compressed air consumption
  2. To speed up the curing of primer
  3. To keep the spray gun nozzle clean
  4. To remove solvent vapour and particulates from the breathing zone Correct answer.

Explanation

Refinishing releases isocyanate vapours and paint mist that are harmful when inhaled. Extraction at source removes these contaminants from the operator's breathing zone before they disperse into the workshop. Curing speed and gun cleanliness are unrelated to fume extraction.

Question 4Workshop Safety, Tools and Equipment

Which fire extinguisher is suitable for a small petrol fire in the body shop?

  1. Wet chemical (Class F)
  2. Water (Class A)
  3. Carbon dioxide only for deep-seated fuel fires
  4. Foam (Class B) Correct answer.

Explanation

Petrol is a Class B flammable liquid, and foam extinguishers are designed to blanket such fires and stop vapour release. Water spreads burning fuel, and wet chemical units are intended for cooking oils. Choosing the correct class prevents the fire from being pushed around the workshop.

Question 5Workshop Safety, Tools and Equipment

When should a face shield be worn in addition to safety glasses in the body repair workshop?

  1. When tightening wheel nuts with a torque wrench
  2. When using an angle grinder to cut or grind metal Correct answer.
  3. When reading a paint mixing ratio chart
  4. When moving a vehicle in the yard

Explanation

Angle grinding throws high-speed fragments and sparks toward the face, so a face shield over safety glasses gives the required double protection. Reading charts, moving vehicles and torquing wheel nuts do not generate flying debris at head height. Matching protection to the hazard is the core principle of PPE selection.

Question 6Workshop Safety, Tools and Equipment

What does the colour coding on portable fire extinguishers help a worker do?

  1. Identify the extinguisher's service date
  2. Identify the extinguisher's manufacturer
  3. Identify the extinguisher's weight
  4. Identify the class of fire the extinguisher is intended for Correct answer.

Explanation

Extinguisher colour bands indicate the fire class the unit is designed to tackle, allowing quick selection under pressure. Service dates are recorded on the maintenance label, while weight and maker are marked separately. Knowing the code prevents using the wrong agent on a live fire.

Question 7Workshop Safety, Tools and Equipment

A technician must remove surface rust and old paint from a door skin. Which tool combination is most appropriate?

  1. A pressure washer at maximum setting
  2. A wood chisel struck with a hammer
  3. A random orbital sander with 80-grit paper followed by finer grades Correct answer.
  4. A heat gun alone

Explanation

A random orbital sander with a coarse grit removes paint and rust efficiently while limiting the swirl marks that a rotary tool would leave. Progressing to finer grits prepares the surface for primer. Chisels, pressure washers and heat guns alone cannot produce a paint-ready metal surface.

Question 8Workshop Safety, Tools and Equipment

Why must a compressed air line feeding a spray gun be fitted with a filter-regulator unit?

  1. To warm the air before it reaches the nozzle
  2. To measure the paint viscosity
  3. To remove moisture and oil and hold a steady spraying pressure Correct answer.
  4. To increase the gun's fan width automatically

Explanation

Compressed air carries water condensate and compressor oil that cause fish eyes and poor adhesion if they reach the paint. A filter-regulator traps these contaminants and holds a constant pressure so the spray pattern stays consistent. Neither fan width nor viscosity is set by this unit.

Question 9Workshop Safety, Tools and Equipment

What is the safe procedure before changing a cutting disc on an angle grinder?

  1. Ask a colleague to press the trigger while the disc is swapped
  2. Leave the grinder plugged in but switch it off at the trigger
  3. Disconnect the grinder from the power supply and use the correct pin spanner Correct answer.
  4. Hold the disc by hand while the grinder runs slowly

Explanation

Isolating the tool from the power supply removes any chance of an accidental start while hands are near the spinning spindle. The correct pin spanner seats in the flange holes so the locking nut can be released without damage. Never rely on the trigger alone as a safeguard.

Question 10Workshop Safety, Tools and Equipment

A trolley jack is being used to lift a vehicle for a wheel change. What must be placed under the vehicle before any work begins?

  1. Axle stands rated for the vehicle's weight Correct answer.
  2. Wooden blocks under the tyres only
  3. A second trolley jack at the opposite corner
  4. The removed wheel lying flat under the sill

Explanation

A hydraulic jack can lose pressure or tip, so rated axle stands must carry the load once the vehicle is raised. Placing stands at the correct structural points prevents the vehicle from dropping onto the technician. A wheel or timber block is not a substitute for rated stands.

Question 11Workshop Safety, Tools and Equipment

What is the correct action when a spray booth filter becomes visibly loaded with overspray?

  1. Replace the filter according to the booth schedule Correct answer.
  2. Turn up the booth fan speed to compensate
  3. Spray only light coats until the filter dries
  4. Wash the filter in solvent and refit it wet

Explanation

Loaded filters restrict airflow, which reduces extraction and can cause solvent build-up and contamination in the finish. Filters are consumables and should be replaced on the booth's maintenance schedule. Increasing fan speed does not restore a blocked filter medium.

Question 12Workshop Safety, Tools and Equipment

Which wheel is correct for mounting on a bench grinder used to sharpen chisels and dress welds?

  1. A grinding wheel rated at or above the grinder's spindle speed Correct answer.
  2. A wire brush wheel of a larger diameter
  3. A cut-off wheel rated for the grinder's speed
  4. Any wheel that physically fits the spindle

Explanation

A grinding wheel must be rated for at least the spindle speed of the machine, otherwise centrifugal force can burst it. The wheel's maximum speed is marked on its blotter, and the machine's speed is on the nameplate. Physical fit alone does not confirm that the wheel is safe.

Question 13Workshop Safety, Tools and Equipment

A technician notices a crack in the handle of a torque wrench used for suspension bolts. What is the correct response?

  1. Reduce the torque setting to compensate for the crack
  2. Wrap the handle in tape and continue using the wrench
  3. Use the wrench only for bolts below half its rated torque
  4. Withdraw the wrench from service and report it for repair or replacement Correct answer.

Explanation

A cracked handle can fail under load, causing injury and an inaccurate torque reading on safety-critical suspension fasteners. Damaged tools must be taken out of service and tagged so nobody else uses them. Continuing at lower settings still leaves a defective tool in circulation.

Question 14Workshop Safety, Tools and Equipment

Which practice best controls the risk of solvent vapour ignition while a technician degreases panels?

  1. Storing soaked rags in an open bin beside the work area
  2. Using only low-flammability cleaners in a well-ventilated area away from ignition sources Correct answer.
  3. Working near an open flame heater to dry the panel faster
  4. Sealing the workshop doors and windows to contain the smell

Explanation

Solvent vapours form flammable mixtures with air, so the safest control is to use the least hazardous cleaner available, keep ventilation high and exclude all ignition sources. Heaters, sparks and hot work must be kept well away. Soaked rags also need a self-closing metal bin to prevent spontaneous combustion.

Question 15Workshop Safety, Tools and Equipment

Why is a dust mask with a P2/P3 filter preferred over a simple nuisance dust mask when sanding body filler?

  1. It removes paint solvent vapour
  2. It supplies oxygen to the wearer
  3. It filters fine respirable particles that a nuisance mask lets through Correct answer.
  4. It protects the eyes from grit

Explanation

Sanding cured filler produces very fine particles that can reach deep into the lungs, and a rated particulate filter captures them far better than a loose nuisance mask. Particulate filters do not remove solvent vapour, and they do not supply oxygen. Eye protection and vapour control need separate equipment.

Question 16Workshop Safety, Tools and Equipment

A spray gun is left with solvent in the cup overnight and the needle is found stuck. What is the most likely cause and the correct corrective action?

  1. The fluid tip is worn; replace the whole gun
  2. Dried paint residue has seized the needle; soak and clean the gun before use Correct answer.
  3. The air cap is too large; fit a smaller cap
  4. The packing nut is too loose; tighten it and spray immediately

Explanation

Solvent left in the gun evaporates and leaves hardened resin that binds the needle in the fluid tip. The gun should be stripped, soaked in the correct cleaning solvent and reassembled before use. Forcing a stuck needle damages the tip and seat.

Question 17Workshop Safety, Tools and Equipment

A vehicle is raised on a two-post hoist and the technician notices it rocking when pushed. Which immediate action is correct?

  1. Ask a colleague to hold the vehicle steady
  2. Tighten the hoist lock nuts while the vehicle is raised
  3. Lower the vehicle fully, reposition the arms and re-lift Correct answer.
  4. Continue working but avoid leaning on the vehicle

Explanation

Rocking indicates the arms are not correctly placed or the load is unbalanced, which is a serious drop hazard. The only safe response is to lower the vehicle, re-check the lift points and lift again. Working under an unstable vehicle or relying on a colleague to steady it is unacceptable.

Question 18Workshop Safety, Tools and Equipment

A workshop stores oxygen and acetylene cylinders together chained to a trolley. Which arrangement is correct?

  1. Remove the regulators so the valves can vent freely
  2. Lay both cylinders flat so they cannot topple
  3. Store the acetylene cylinder beside the paint store to save space
  4. Keep them chained upright and separated with a fire-resistant barrier or distance Correct answer.

Explanation

Fuel gas and oxygen cylinders must be stored upright, secured against falling and separated from each other by distance or a fire-resistant barrier to prevent a leak from feeding a fire. Laying cylinders flat can allow liquid fuel gas to enter the regulator. Regulators must stay fitted and valves closed.

Question 19Workshop Safety, Tools and Equipment

A technician is diagnosing why a spray gun spits droplets into the pattern after a filter-regulator was fitted. Which fault should be investigated first?

  1. The fluid needle spring is too strong
  2. The fan adjustment screw is fully open
  3. The paint is too thin
  4. Water or oil is passing the filter element, which is saturated Correct answer.

Explanation

Spitting usually means liquid contamination in the air line, so a saturated filter element allowing water or oil through is the first suspect. The element should be drained and replaced, and the line checked for a missing dryer. Needle spring tension and fan settings affect atomisation but not droplet ejection.

Question 20Workshop Safety, Tools and Equipment

During a risk assessment of a panel beating bay, which control follows the hierarchy of control most correctly?

  1. Post a warning sign and take no further action
  2. Rotate staff so each person is exposed for shorter periods only
  3. Eliminate or reduce impact noise by using a press or dolly system before relying on PPE Correct answer.
  4. Issue ear defenders as the first step for all hammer work

Explanation

The hierarchy of control requires hazards to be eliminated or reduced at source before administrative measures and PPE are considered. Engineering out hammer noise with a press or dolly system protects everyone without relying on individual compliance. PPE and rotation are last-resort controls that should supplement, not replace, source reduction.

Question 21Materials, Fasteners and Body Construction

In light vehicle body construction, which material is most commonly used for the outer skin panels of a modern passenger car bonnet?

  1. Cast iron
  2. Structural aluminium extrusion
  3. Carbon fibre composite
  4. Mild steel sheet Correct answer.

Explanation

Outer skin panels such as bonnets and doors are formed from thin mild steel or, increasingly, aluminium sheet because it is ductile and easy to press and finish. Cast iron is too brittle and heavy for panels, while extrusions and composites are used in structural or specialist applications rather than general skin panels.

Question 22Materials, Fasteners and Body Construction

A rivet that is set by pulling a mandrel through the body so the tail expands is best described as which type?

  1. Self-tapping screw
  2. Threaded insert
  3. Solid rivet
  4. Blind rivet Correct answer.

Explanation

A blind rivet, often called a pop rivet, is installed from one side only by drawing a mandrel that expands the tail and then snaps off. This makes it suitable where the reverse side of the joint is inaccessible, unlike a solid rivet which needs access to both faces for a bucking bar.

Question 23Materials, Fasteners and Body Construction

Which property of a steel panel describes its ability to be stretched and bent permanently without cracking?

  1. Ductility Correct answer.
  2. Elasticity
  3. Brittleness
  4. Hardness

Explanation

Ductility is the ability of a metal to undergo permanent plastic deformation under tension without fracturing, which is what allows panels to be pressed and hammered into shape. Elasticity is temporary recovery of shape, hardness resists indentation, and brittleness is the opposite of ductility.

Question 24Materials, Fasteners and Body Construction

In a body shell, which structural component is designed primarily to absorb energy during a frontal impact?

  1. Rear quarter glass
  2. Front crumple zone rail Correct answer.
  3. Door skin
  4. Roof drip rail

Explanation

Crumple zones in the front rails are engineered to deform progressively and absorb kinetic energy in a collision, protecting the passenger cell. Door skins, drip rails and glass are non-structural or trim items that do not carry the main crash load path.

Question 25Materials, Fasteners and Body Construction

Which type of steel is commonly used for high-strength structural sections in modern body shells because it combines strength with reduced weight?

  1. High-strength low-alloy steel Correct answer.
  2. Pure wrought iron
  3. Copper sheet
  4. Grey cast iron

Explanation

High-strength low-alloy steels give higher yield strength than mild steel at similar thickness, allowing lighter structural sections that still meet crash requirements. Wrought iron, cast iron and copper are not used for modern load-bearing body structures.

Question 26Materials, Fasteners and Body Construction

A technician is joining two overlapping aluminium panels and wants to avoid a corrosion problem at the joint. Which practice is most appropriate?

  1. Weld them with a mild steel filler rod
  2. Rivet them with uncoated steel rivets
  3. Apply an isolating sealant and use compatible fasteners Correct answer.
  4. Bolt them with plain steel bolts and no isolation

Explanation

Joining aluminium to steel fasteners creates a galvanic couple, and the aluminium becomes the anode and corrodes. Isolating the joint with a suitable sealant and using compatible or coated fasteners prevents the galvanic cell from forming.

Question 27Materials, Fasteners and Body Construction

Why is a spot weld commonly used to assemble pressed steel body panels?

  1. It produces a continuous watertight seam along the whole joint
  2. It gives a strong local joint quickly without adding filler metal Correct answer.
  3. It works only on aluminium and cannot join steel
  4. It requires no electrical current and relies on friction

Explanation

Resistance spot welding passes a high current through the overlapping sheets under pressure, fusing a small nugget at each point. It is fast, needs no filler wire and is easily automated, which suits high-volume steel body assembly.

Question 28Materials, Fasteners and Body Construction

When replacing a bolt on a suspension mounting point, which factor most directly determines the correct grade to fit?

  1. The colour of the bolt head
  2. The tensile strength marked on the bolt head Correct answer.
  3. The length of the bolt thread
  4. The diameter of the washer

Explanation

High-strength bolts carry property class markings on the head, such as 8.8 or 10.9, which indicate tensile strength and are specified for safety-critical joints. Fitting a lower grade than specified can lead to bolt failure under load.

Question 29Materials, Fasteners and Body Construction

A panel shows a small dent with stretched metal around it. Which repair approach best restores the panel without excess filler?

  1. Hammer the dent outward from the outside only
  2. Fill the dent deeply with body filler and sand flat
  3. Shrink the stretched area with heat or a shrinking hammer, then finish Correct answer.
  4. Cut the whole panel out and replace it

Explanation

Stretched metal has lost its original shape and must be shrunk back before finishing, using controlled heat or a shrinking hammer, so only a thin skim of filler is needed. Deep filler over stretched metal cracks and sinks over time.

Question 30Materials, Fasteners and Body Construction

Which fastener is designed to be removed and refitted repeatedly without damaging the thread in a plastic trim panel? Assume the fastener is suitable for the plastic, correct torque is used and refitting follows the existing thread.

  1. Blind rivet
  2. Thread-forming screw Correct answer.
  3. Spring washer
  4. Plastic push-fit clip

Explanation

A suitable thread-forming screw displaces plastic to form a mating thread that can be reused during servicing. Repeat assembly depends on the screw and plastic being correctly specified, using the correct tightening torque and re-entering the existing thread. A push-fit clip does not engage a screw thread.

Question 31Materials, Fasteners and Body Construction

In a body repair workshop, a galvanised steel panel is being repaired. Why must the zinc coating be restored after welding or grinding?

  1. To protect the bare steel from rust Correct answer.
  2. To improve the paint colour match
  3. To make the panel lighter
  4. To increase the panel's magnetic strength

Explanation

The zinc coating on galvanised steel protects the underlying steel sacrificially; welding and grinding remove it and leave bare steel exposed to moisture. Reapplying a zinc-rich coating restores corrosion protection at the repaired area.

Question 32Materials, Fasteners and Body Construction

Which body construction method uses a separate chassis frame with the body shell bolted on top?

  1. Monocoque construction
  2. Spaceframe construction
  3. Unitised construction
  4. Body-on-frame construction Correct answer.

Explanation

Body-on-frame, or separate chassis, construction mounts the body shell onto a strong ladder frame, which is common on light commercial vehicles and some 4x4s. Monocoque and unitised construction combine the body and frame into one stressed structure.

Question 33Materials, Fasteners and Body Construction

A repairer is choosing a rivet to join two thin aluminium sheets where access is available on both sides and a flush finish is required. Which is most suitable?

  1. A self-tapping screw
  2. A plastic trim clip
  3. A solid countersunk rivet Correct answer.
  4. A blind pop rivet with a protruding head

Explanation

A solid countersunk rivet can be set from both sides and sits flush with the surface, giving a strong, neat joint in thin sheet. A protruding pop rivet leaves a raised head, while clips and screws are not suitable for a flush structural joint.

Question 34Materials, Fasteners and Body Construction

Which statement best explains why boron steels are used in selected areas of a body shell?

  1. They resist paint adhesion and reduce finishing time
  2. They can be formed soft and then hardened to give very high strength in critical areas Correct answer.
  3. They are lighter than aluminium for the same strength
  4. They are cheap and easy to form into complex shapes

Explanation

Boron steels are supplied in a formable state and are hardened during the press and paint bake process, giving very high strength in safety-critical areas such as B-pillars. This allows thinner, lighter sections while meeting crash requirements.

Question 35Materials, Fasteners and Body Construction

A technician finds a bolted subframe joint where the bolt has loosened repeatedly. Which is the most likely cause to investigate first?

  1. The bolt head is the wrong colour
  2. The bolt thread is left-handed
  3. The bolt has been over-tightened and stretched beyond its elastic limit Correct answer.
  4. The washer is too thin

Explanation

Over-tightening a bolt beyond its elastic limit stretches it permanently, so it loses clamp load and loosens under vibration. Checking torque specification and whether the bolt has yielded is the first diagnostic step.

Question 36Materials, Fasteners and Body Construction

Which combination of properties makes aluminium attractive for body panels despite its higher cost?

  1. High magnetic permeability and high hardness
  2. Low density and good corrosion resistance Correct answer.
  3. High density and low strength
  4. Low melting point and high brittleness

Explanation

Aluminium has roughly one-third the density of steel and forms a protective oxide layer, so panels are lighter and resist corrosion well. Its lower density is the main reason it is chosen for weight reduction despite higher material cost.

Question 37Materials, Fasteners and Body Construction

A body shell uses tailored blanks in its construction. What is the main advantage of a tailored blank?

  1. It allows different thicknesses or grades of steel to be joined before pressing into one part Correct answer.
  2. It removes the need for corrosion protection
  3. It makes the panel fully transparent to paint
  4. It eliminates the need for any welding in the finished body

Explanation

A tailored blank is made by laser-welding different steel sheets, often of varying thickness or grade, into one flat blank before forming. This puts strength where it is needed and saves weight compared with a uniform panel.

Question 38Materials, Fasteners and Body Construction

During a structural repair, a repairer proposes heating a high-strength steel B-pillar with an oxy-acetylene torch to straighten it. Why is this approach generally unacceptable?

  1. The torch flame cannot heat steel above 200 degrees Celsius
  2. Excessive heat can destroy the steel's heat treatment and reduce its crash strength Correct answer.
  3. The heat will change the paint colour only
  4. Heating makes the steel too soft to weld later

Explanation

High-strength and boron steels gain their strength from controlled heat treatment, and uncontrolled torch heating can anneal or soften the affected zone, reducing crash performance. Manufacturers specify approved repair methods, often cold straightening or section replacement, for these areas.

Question 39Materials, Fasteners and Body Construction

A repairer is assessing a monocoque body shell after a side impact. Which observation most strongly indicates that the structural integrity of the passenger cell may be compromised?

  1. A deformed sill and distorted door aperture Correct answer.
  2. A loose wheel trim
  3. A scratched door handle
  4. A cracked wing mirror

Explanation

The sill and door aperture are part of the load-bearing lower structure of a monocoque, so deformation there suggests the passenger cell has been stressed. Cosmetic items such as handles, mirrors and trims give no indication of structural damage.

Question 40Materials, Fasteners and Body Construction

A manufacturer specifies that a welded joint in a modern body uses a structural adhesive in addition to spot welds. What is the main engineering benefit of this combination?

  1. It allows the joint to be dismantled easily for later repairs
  2. It increases joint stiffness and fatigue life while spreading load across the bond area Correct answer.
  3. It makes the joint lighter than an adhesive-only joint
  4. It removes the need for any surface preparation before welding

Explanation

Combining adhesive with spot welds increases stiffness and fatigue resistance because the adhesive spreads load continuously across the joint rather than concentrating it at weld nuggets. The welds also hold the panels in position while the adhesive cures.

Question 41Body Panel Removal, Replacement and Alignment

When removing a front wing (fender) from a light vehicle, which fasteners are typically found along the top flange under the bonnet?

  1. Wheel nuts securing the wing to the hub
  2. Bolts or screws securing the wing to the inner wing and radiator support Correct answer.
  3. Brake caliper bolts
  4. Suspension strut pinch bolts

Explanation

The top flange of a front wing is fastened to the inner wing panel and radiator support with a row of bolts or screws, often along with plastic clips. These must be located and removed before the wing can be separated. Wheel, brake and suspension fasteners are unrelated to wing attachment.

Question 42Body Panel Removal, Replacement and Alignment

Before unbolting a bolt-on front wing, why should the technician note the shim gaps and fastener positions?

  1. To set the wheel alignment angles
  2. To adjust the headlamp beam pattern
  3. To restore panel gaps and alignment on refitting Correct answer.
  4. To record the tyre tread depth

Explanation

Bolt-on panels are positioned by the factory using shims and specific fastener locations, so recording gaps preserves the original fit. If this is not done, the replacement wing may sit proud or tight against the bonnet and door. Wheel alignment, headlamp aim and tyre condition are separate checks.

Question 43Body Panel Removal, Replacement and Alignment

Which tool is most appropriate for releasing the plastic push-rivets that retain a bumper cover?

  1. A plastic trim removal fork Correct answer.
  2. A cold chisel
  3. A torque wrench
  4. A ball-peen hammer

Explanation

Plastic push-rivets and clips are designed to be levered out with a non-marking trim tool that spreads the load without damaging the cover. Hammers and chisels would crack the plastic or distort the panel. A torque wrench is for tightening threaded fasteners to a set value.

Question 44Body Panel Removal, Replacement and Alignment

What is the main purpose of a spot-weld drill in body panel replacement?

  1. To cut threads for machine screws
  2. To drill holes for pop rivets in plastic trim
  3. To remove the weld nugget joining two spot-welded panels Correct answer.
  4. To enlarge bolt holes in the chassis

Explanation

A spot-weld drill has a flat pilot that centres on the weld nugget and cuts away the joined material so the outer panel can be lifted off. It is not used for plastic trim, hole enlargement or thread cutting. Correct use minimises damage to the underlying panel.

Question 45Body Panel Removal, Replacement and Alignment

Which type of panel is designed to be cut out and welded in during a repair because it is factory spot-welded rather than bolted?

  1. A bonnet secured by hinges
  2. A welded quarter panel Correct answer.
  3. A removable bumper cover
  4. A bolt-on front wing

Explanation

Quarter panels are usually welded into the body shell at the factory, so replacement involves cutting out the old panel and welding in the new one. Bolt-on wings, bumper covers and hinged bonnets are fastened with removable fixings. This distinction drives the repair method and time.

Question 46Body Panel Removal, Replacement and Alignment

Why must the battery be disconnected before arc welding anywhere on a vehicle body?

  1. To stop the alternator charging the battery
  2. To reduce the weight of the vehicle
  3. To allow the welding helmet to fit
  4. To protect the vehicle electronics from welding current surges Correct answer.

Explanation

Welding current can travel through the body and damage sensitive electronic control units and wiring if the battery is connected. Disconnecting and isolating the battery removes this path and protects the vehicle systems. Charging, helmet fit and vehicle weight are not the reason.

Question 47Body Panel Removal, Replacement and Alignment

What does a panel gap gauge measure during body alignment?

  1. The torque of the wing bolts
  2. The thickness of paint on the panel
  3. The uniform clearance between adjacent panels Correct answer.
  4. The diameter of the spot welds

Explanation

A gap gauge measures the clearance between adjacent panels so the technician can confirm an even, factory-like fit. Uneven gaps indicate misalignment that must be corrected before final tightening. Paint thickness, bolt torque and weld diameter are measured with other instruments.

Question 48Body Panel Removal, Replacement and Alignment

Which fixing method is commonly used to refit a plastic bumper cover after repair?

  1. Continuous MIG welding
  2. Structural adhesive only
  3. Reusable plastic clips and screws Correct answer.
  4. Bronze brazing

Explanation

Bumper covers are refitted with the plastic clips, push-rivets and screws used originally, which allow removal for future service. Welding, brazing and adhesive-only fixing are not appropriate for a removable plastic cover. Correct clips also help maintain the panel gaps.

Question 49Body Panel Removal, Replacement and Alignment

A technician is replacing a bolt-on front wing and finds the new panel sits 4 mm proud of the door. Which action best addresses the misalignment?

  1. Add extra paint to the door edge
  2. Grind material from the door edge
  3. Force the door hinge to close the gap
  4. Loosen the wing fasteners and adjust shims and position before retightening Correct answer.

Explanation

Bolt-on panels have adjustment in their mounting holes and shims, so loosening and repositioning corrects the gap without damaging parts. Forcing hinges, grinding edges or adding paint would damage the finish and not fix the underlying fit. Alignment should always be resolved at the fixings.

Question 50Body Panel Removal, Replacement and Alignment

Why is a stitch (tack) weld pattern used when welding a replacement panel into position before final welding?

  1. To avoid the need for clamping
  2. To increase the welding current
  3. To speed up paint curing
  4. To control heat build-up and prevent panel distortion Correct answer.

Explanation

Spaced tack welds allow heat to dissipate between passes, which limits warping of thin body steel. Once the panel is stable, the seams are welded with alternating stitches. Stitch welding does not change current settings, replace clamps or affect paint curing.