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CTVET Ghana Certificate II - Auto Body Repair & Spraying study materials
CTVET Ghana Certificate II - Auto Body Repair & Spraying study resources

CTVET Ghana Certificate II - Auto Body Repair & Spraying practice questions

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Question 1Occupational Health, Safety and Environmental Practices

In an auto body workshop, which type of fire extinguisher is the correct first choice for a small fire in a pan of thinner or paint solvent?

  1. Water stored-pressure extinguisher
  2. Wet chemical extinguisher
  3. Foam extinguisher only
  4. Carbon dioxide or dry powder extinguisher Correct answer.

Explanation

Flammable liquids such as thinner and solvent are Class B fires, and carbon dioxide or dry powder extinguishers smother them without spreading the burning liquid. Water is dangerous here because it can splash the flaming solvent and spread the fire over a wider area.

Question 2Occupational Health, Safety and Environmental Practices

Before a spray painter enters a booth to spray two-pack polyurethane clear coat, what is the most important respiratory protection requirement?

  1. A dust mask rated for nuisance dust
  2. A supplied-air respirator with full face protection Correct answer.
  3. A cloth soaked in water tied over the nose
  4. A single disposable surgical mask

Explanation

Two-pack isocyanate hardeners can cause serious lung sensitisation and asthma, so the sprayer needs a supplied-air respirator that delivers clean breathing air and covers the face. Dust masks and surgical masks give no protection against isocyanate vapour and fine paint mist.

Question 3Occupational Health, Safety and Environmental Practices

A technician must move a full 20-litre drum of thinner from a delivery bay to the mixing room. Which manual handling approach best reduces the risk of back injury?

  1. Lift the drum alone and twist quickly to save time
  2. Drag the drum along the floor by the rim
  3. Roll the drum on a trolley or drum dolly kept at waist height Correct answer.
  4. Carry the drum at chest height with straight arms

Explanation

Using a trolley or drum dolly keeps the load close to the body and at waist height, avoiding the bending and twisting that injure the lower back. Carrying at chest height with straight arms puts the load far from the spine and greatly increases the strain.

Question 4Occupational Health, Safety and Environmental Practices

Which personal protective equipment is essential when mixing body filler and sanding it after it has cured?

  1. Only safety boots
  2. Eye protection, nitrile gloves and a dust mask or respirator Correct answer.
  3. Ear defenders alone
  4. A welding helmet and leather apron

Explanation

Mixing filler exposes the skin and eyes to styrene and peroxide hardener, and sanding cured filler produces fine dust that irritates the lungs and eyes. Eye protection, nitrile gloves and suitable respiratory protection therefore cover both the chemical and dust hazards.

Question 5Occupational Health, Safety and Environmental Practices

After spraying a vehicle panel, what is the correct way to deal with leftover mixed paint and dirty solvent?

  1. Tip it onto the ground behind the workshop
  2. Store it in a labelled, closed container for licensed disposal Correct answer.
  3. Burn it in an open drum at the end of the day
  4. Pour it down the workshop drain with plenty of water

Explanation

Leftover paint and dirty solvent are hazardous wastes that must be kept in labelled closed containers and handed to a licensed waste contractor. Pouring them into drains, soil or open burning pollutes water and air and is illegal under environmental regulations.

Question 6Occupational Health, Safety and Environmental Practices

What does the yellow diamond hazard label with a flame symbol on a thinner container indicate?

  1. The contents are toxic by inhalation only
  2. The contents are flammable Correct answer.
  3. The contents are corrosive to metal
  4. The contents are an oxidising gas

Explanation

A flame symbol on a hazard diamond identifies a flammable substance that can ignite readily and must be kept away from ignition sources. Other hazards such as corrosion or toxicity use different pictograms and colours.

Question 7Occupational Health, Safety and Environmental Practices

A spray gun must be cleaned with solvent. Which practice best controls the solvent exposure in the workshop?

  1. Use a enclosed gun washer with a lid in a ventilated area Correct answer.
  2. Clean the gun only after the booth extraction is switched off
  3. Blow solvent vapour across the booth with compressed air
  4. Clean the gun in an open bucket beside the main workbench

Explanation

An enclosed gun washer with a lid captures solvent vapour and prevents splashing, while good ventilation removes any vapour that escapes. Cleaning in the open or blowing vapour with compressed air spreads solvent into the breathing zone.

Question 8Occupational Health, Safety and Environmental Practices

An SDS for a primer states that it is a skin sensitiser. What does this mean for a spray technician?

  1. The product is safe to use without gloves once it has dried
  2. The hazard applies only if the product is swallowed
  3. Repeated skin contact can trigger an allergic reaction that may worsen with further exposure Correct answer.
  4. A single brief contact will always cause a chemical burn

Explanation

A skin sensitiser can cause an allergic skin reaction after repeated contact, and once sensitised a person may react to very small amounts. The correct control is to prevent skin contact with gloves and good hygiene rather than relying on short exposure being safe.

Question 9Occupational Health, Safety and Environmental Practices

A painter notices dizziness and headache while spraying in a booth. What is the most appropriate immediate action?

  1. Increase the spray pressure to finish faster
  2. Drink water and carry on with a different paint
  3. Continue spraying and open a nearby door
  4. Stop work, leave the area and get fresh air, then report the symptoms Correct answer.

Explanation

Dizziness and headache in a spray booth suggest solvent vapour overexposure, so the painter should stop, move to fresh air and report the incident so the ventilation and controls can be checked. Continuing work increases exposure and may lead to loss of consciousness.

Question 10Occupational Health, Safety and Environmental Practices

Which storage arrangement is correct for full and part-used containers of paint, thinner and hardener in an auto body shop?

  1. Under the workbench in open trays
  2. In a locked, ventilated cabinet away from ignition sources and oxidisers Correct answer.
  3. Beside the booth filter bank for quick access
  4. On a high shelf above the compressor

Explanation

Flammable liquids should be kept in a locked, ventilated cabinet that is away from ignition sources and separated from oxidisers and compressed gases. This limits the fuel available in a fire and prevents unauthorised access.

Question 11Occupational Health, Safety and Environmental Practices

Why must a spray booth be kept under slight negative pressure relative to the surrounding workshop?

  1. To stop paint mist and vapour escaping into adjacent work areas Correct answer.
  2. To keep the booth warmer than the workshop
  3. To reduce the noise of the extraction fan
  4. To make the paint dry faster

Explanation

Negative pressure means air flows into the booth rather than out, so overspray and solvent vapour are drawn into the extraction instead of leaking into the workshop. This protects other workers from breathing paint mist and solvent.

Question 12Occupational Health, Safety and Environmental Practices

A worker is about to use an angle grinder to cut a damaged panel. Which combination of controls is most appropriate?

  1. Sunglasses and cotton overalls
  2. Face shield, hearing protection, gloves and a fire watch for sparks Correct answer.
  3. Only a dust mask
  4. No PPE if the cut takes less than a minute

Explanation

Grinding and cutting throw hot sparks and metal fragments and produce high noise, so a face shield, hearing protection and gloves are needed. Sparks can ignite solvent vapour or waste, so a fire watch and removal of flammables from the area are also required.

Question 13Occupational Health, Safety and Environmental Practices

What is the main reason for keeping compressed air lines and blow guns below the pressure limit set for cleaning body panels?

  1. To prevent air injection injuries and excessive airborne dust Correct answer.
  2. To stop the compressor from overheating
  3. To make the air smell cleaner
  4. To save electricity on the compressor

Explanation

High-pressure air directed at the skin can force air and contaminants into tissue, causing serious injection injuries, and it also throws dust into the air. Regulating the pressure and using the correct nozzle reduce both hazards.

Question 14Occupational Health, Safety and Environmental Practices

A technician spills about one litre of basecoat on the workshop floor. What is the correct order of response?

  1. Cover it with sawdust and leave it until the end of the shift
  2. Evacuate and ventilate, contain the spill with absorbent, clean up and dispose as hazardous waste Correct answer.
  3. Wash the spill into the drain, then open a window
  4. Mop it up with a rag and put the rag in the general bin

Explanation

The spill should first be controlled by removing ignition sources and improving ventilation, then contained with absorbent so it cannot spread or reach drains. The used absorbent is hazardous waste and must be bagged and disposed of through the licensed route.

Question 15Occupational Health, Safety and Environmental Practices

Which statement correctly describes the purpose of a risk assessment before a repair job begins?

  1. It records the final cost of the repair
  2. It is only needed after an accident has happened
  3. It replaces the need for PPE and training
  4. It identifies hazards and decides controls before work starts Correct answer.

Explanation

A risk assessment identifies what could cause harm in the job and decides the controls needed to reduce that risk to an acceptable level before work begins. It supports PPE and training but never replaces them, and it is not an accident report.

Question 16Occupational Health, Safety and Environmental Practices

A sprayer has been using a solvent-based product and develops a red, itchy rash on the forearms. Which interpretation and action is most appropriate?

  1. It may be work-related dermatitis, so report it, check glove use and seek medical advice Correct answer.
  2. It means the sprayer must never work in the booth again
  3. It is caused by the spray gun and needs a new nozzle
  4. It is normal and will clear without any change

Explanation

Red, itchy skin on exposed forearms after solvent contact is a classic sign of occupational dermatitis, which should be reported early so glove type, hand washing and product contact can be reviewed. Early reporting and medical advice improve the chance of full recovery.

Question 17Occupational Health, Safety and Environmental Practices

A workshop uses a two-pack product containing isocyanate hardener. Which control measure is most important for protecting workers who are not spraying but are working nearby?

  1. Asking them to hold their breath when the gun is triggered
  2. Giving them the same dust mask as the sprayer
  3. Spraying only when they are on their break
  4. Physical separation and extraction so mist and vapour do not reach them Correct answer.

Explanation

Isocyanate mist and vapour can travel beyond the spray area, so separation and effective extraction are needed to keep them out of other workers' breathing zones. Respiratory protection for the sprayer alone does not protect nearby workers.

Question 18Occupational Health, Safety and Environmental Practices

A vehicle arrives with a suspected leaking LPG or refrigerant line in the air-conditioning system. Before any panel work or welding begins, what should the technician do?

  1. Start welding immediately because the system is sealed
  2. Identify the system, isolate or recover the gas and follow the vehicle-specific safety procedure Correct answer.
  3. Spray the area with solvent to find the leak
  4. Open the system by cracking a pipe to check for pressure

Explanation

Refrigerant and LPG systems can release gas that is flammable, asphyxiating or decomposes into toxic products when heated, so the system must be identified and made safe before hot work. Recovery of refrigerant by trained personnel prevents both fire and environmental release.

Question 19Occupational Health, Safety and Environmental Practices

A booth's extraction airflow is measured and found to be below the design value. What is the best interpretation for a spray painter?

  1. Vapour and mist may not be cleared, so spraying should stop until the fault is fixed Correct answer.
  2. The lower airflow will improve finish quality
  3. Only the paint consumption will increase
  4. The booth is still safe because the filters were changed last month

Explanation

Extraction below design means solvent vapour and paint mist are not being removed from the breathing zone, so exposure can rise quickly. Spraying should stop and the fault, such as blocked filters or a fan problem, should be corrected and airflow rechecked.

Question 20Occupational Health, Safety and Environmental Practices

A workshop is planning to reduce waste from spray operations. Which change gives the greatest combined environmental and cost benefit?

  1. Spraying at higher pressure to use the paint faster
  2. Mixing only the paint quantity needed and using a gun washer with solvent recycling Correct answer.
  3. Buying more solvent for gun cleaning
  4. Storing waste paint in open drums for later sorting

Explanation

Mixing only the required quantity reduces leftover paint at source, and a gun washer with solvent recycling cuts both solvent purchase and hazardous waste volume. Source reduction and recycling are preferred over disposal under waste hierarchy principles.

Question 21Tools, Equipment and Workshop Maintenance

Which PPE must a spray painter wear when mixing and applying two-pack (2K) polyurethane clearcoat in the booth?

  1. A face shield, PVC apron and ear defenders
  2. An air-fed full-face respirator, nitrile gloves and coveralls Correct answer.
  3. A disposable surgical mask, latex gloves and goggles
  4. A cotton dust mask, leather gloves and safety boots

Explanation

Two-pack polyurethane contains isocyanate hardeners that are harmful by inhalation and skin contact, so an air-fed respirator supplying clean air, nitrile gloves and full coveralls are required. A dust mask or surgical mask gives no protection against isocyanate vapour.

Question 22Tools, Equipment and Workshop Maintenance

What is the correct procedure for storing a compressed gas cylinder used in the body shop, such as an oxy-acetylene set?

  1. Keep it loose in the corner so it can be moved quickly
  2. Store it in the paint mixing room beside solvent drums
  3. Lay it horizontally under the workbench with the regulator left on
  4. Stand it upright and secure it with a chain or strap against a wall or trolley Correct answer.

Explanation

Cylinders must be kept upright and restrained so they cannot fall and shear the valve, which can turn the cylinder into a projectile. They must also be kept away from solvents and ignition sources.

Question 23Tools, Equipment and Workshop Maintenance

A technician notices the spray gun is spitting droplets onto the panel during application. Which maintenance fault is the most likely cause?

  1. The air compressor is set too high for the gun
  2. The panel has been cleaned with the wrong solvent
  3. The booth extraction fan is running too slowly
  4. The fluid needle packing or nozzle is worn or clogged Correct answer.

Explanation

Spitting usually indicates a worn fluid needle, a damaged nozzle seat or a partly blocked fluid passage, so the gun needs stripping, cleaning and parts replacement. Air pressure, panel cleaning and booth extraction affect finish quality but do not produce droplets from the gun.

Question 24Tools, Equipment and Workshop Maintenance

What is the main purpose of fitting a moisture trap and regulator to a compressed air line feeding a spray gun?

  1. To lubricate the gun's internal moving parts
  2. To increase the compressor output pressure
  3. To remove water and oil from the air and set the correct spraying pressure Correct answer.
  4. To cool the air before it reaches the gun

Explanation

A moisture trap and filter remove condensed water and oil carried in the compressed air, while the regulator sets a steady pressure for correct atomisation. Water or oil reaching the gun causes defects such as fish eyes and blushing.

Question 25Tools, Equipment and Workshop Maintenance

After spraying, which sequence correctly describes cleaning a gravity-feed spray gun before storage?

  1. Remove the nozzle and store it loose inside the cup
  2. Soak the whole gun in water overnight, then blow it dry
  3. Empty the cup, flush solvent through the fluid passages, clean the air cap, then reassemble Correct answer.
  4. Wipe only the outside of the gun and leave the cup attached

Explanation

The cup is emptied, solvent is flushed through the fluid path and the air cap is cleaned separately so that paint does not set in the passages. The gun is then reassembled and lightly lubricated where the manufacturer specifies.

Question 26Tools, Equipment and Workshop Maintenance

Which item of workshop equipment is used to check that a repaired body panel is aligned correctly before final welding?

  1. A hygrometer
  2. A tram gauge or measuring system Correct answer.
  3. A paint thickness gauge
  4. A tyre pressure gauge

Explanation

A tram gauge or a dedicated body measuring system compares reference points on the vehicle to confirm that panels and structural parts are aligned. A paint thickness gauge measures coating depth, not alignment.

Question 27Tools, Equipment and Workshop Maintenance

What is the correct action when a hydraulic body jack begins to sink slowly under load?

  1. Pump the handle faster to maintain the height
  2. Add extra hydraulic oil to the reservoir before each use
  3. Take it out of service and have the hydraulic seals checked and repaired Correct answer.
  4. Continue using it but place a wooden block under the wheels

Explanation

A jack that sinks under load has a fault such as worn seals or a leaking valve and must be withdrawn from service and repaired by a competent person. Continuing to use it creates a serious crush hazard.

Question 28Tools, Equipment and Workshop Maintenance

Which practice best protects a spray booth's extraction filters and keeps airflow within specification?

  1. Recording filter condition and differential pressure, and changing filters at the manufacturer's interval Correct answer.
  2. Running the booth with the extraction fan switched off during flash-off
  3. Washing the exhaust filter in solvent and refitting it wet
  4. Replacing the intake filter monthly regardless of use

Explanation

Filter loading is monitored by inspection and pressure differential, and filters are replaced at the interval specified for the booth. This keeps extraction airflow and overspray capture within the designed range.

Question 29Tools, Equipment and Workshop Maintenance

What is the correct way to maintain a torque wrench used for tightening body bolts?

  1. Adjust it beyond its maximum scale to check it still clicks
  2. Use it as a breaker bar and store it with the spring wound up
  3. Store it at its lowest setting, avoid dropping it and have it calibrated periodically Correct answer.
  4. Oil the scale markings and store it in a bucket of solvent

Explanation

A torque wrench should be backed off to its lowest setting after use so the internal spring is not held under load, and it must be handled carefully and calibrated at intervals. Using it as a breaker bar or over-ranging it damages the mechanism and destroys accuracy.

Question 30Tools, Equipment and Workshop Maintenance

During a compressor inspection, the receiver drain is opened and a large quantity of water is discharged. What does this indicate and what action is needed?

  1. The air receiver is over-pressurised and the safety valve is faulty
  2. Normal operation; no action is needed
  3. The compressor oil level is too high and should be topped up
  4. Excess condensate is collecting, so the drain interval should be shortened and the dryer checked Correct answer.

Explanation

Water in the receiver is normal condensate, but a large volume means the drain is not being opened often enough or the air dryer is not working. The drain schedule should be tightened and the dryer inspected.

Question 31Tools, Equipment and Workshop Maintenance

Which maintenance task is required to keep a spray booth's lighting safe and effective for colour matching?

  1. Increasing bulb wattage beyond the booth specification
  2. Painting the light fittings to match the booth walls
  3. Cleaning diffusers and replacing failed tubes with the specified colour-rendering type Correct answer.
  4. Removing diffusers to increase brightness

Explanation

Dirty diffusers reduce light output and colour accuracy, so they must be cleaned, and failed tubes replaced with the specified type so colour rendering stays consistent. Altering wattage or removing diffusers compromises safety and colour matching.

Question 32Tools, Equipment and Workshop Maintenance

A technician is preparing to MIG weld a body panel. Which equipment check should be completed first?

  1. Setting the wire speed to maximum to speed up the job
  2. Checking the gas flow, earth clamp connection and wire feed before striking an arc Correct answer.
  3. Filling the coolant reservoir with tap water
  4. Removing the earth clamp to avoid sparks near the panel

Explanation

Before welding, the shielding gas flow, the earth clamp contact and the wire feed should be checked so the weld is sound and the circuit is safe. A poor earth or gas flow produces porosity and unstable arcs.

Question 33Tools, Equipment and Workshop Maintenance

Which storage practice keeps body filler and hardener in usable condition in a hot workshop?

  1. Store the filler tubs sealed in a cool, dry place away from direct sunlight and keep hardener in its original labelled container Correct answer.
  2. Mix hardener into the main filler tub to save time
  3. Leave filler tubs open so solvent can escape
  4. Store hardener next to the paint oven to keep it warm

Explanation

Body filler and its hardener are sensitive to heat and moisture, so sealed storage in a cool, dry place away from sunlight preserves shelf life. Hardener must stay in its labelled container and never be pre-mixed into the filler tub.

Question 34Tools, Equipment and Workshop Maintenance

What is the purpose of a residual current device (RCD) fitted to the power supply of workshop equipment such as a polisher?

  1. To increase the motor speed under load
  2. To filter dust from the motor cooling air
  3. To reduce the voltage supplied to the tool
  4. To disconnect the supply quickly if current leaks to earth, protecting the operator from electric shock Correct answer.

Explanation

An RCD detects a small imbalance between live and neutral current, which indicates leakage to earth, and trips the supply to prevent a fatal shock. It does not regulate voltage or motor speed.

Question 35Tools, Equipment and Workshop Maintenance

A random orbital sander is leaving swirl marks on a prepared panel. Which maintenance or setup cause should be investigated first?

  1. The workshop temperature is below 20 degrees Celsius
  2. The backing pad is worn or the abrasive grade is too coarse Correct answer.
  3. The compressor tank is too large
  4. The panel has too many coats of primer

Explanation

Swirl marks commonly come from a worn or distorted backing pad, a damaged interface pad or an abrasive that is too coarse for the stage of preparation. These should be checked and replaced before changing technique.

Question 36Tools, Equipment and Workshop Maintenance

Which routine check should be made on a vehicle lift before raising a car at the start of a shift?

  1. Grease the lift arms while a vehicle is supported
  2. Confirm the lift is fully lowered and check for hydraulic leaks, damaged cables and secure lift pads Correct answer.
  3. Check the tyre pressures of the vehicle to be lifted
  4. Test the lift by raising it fully with no vehicle on it

Explanation

A pre-use inspection checks the lift in the lowered position for hydraulic leaks, cable or chain damage and secure pads before any vehicle is raised. Faults must be reported and the lift taken out of service.

Question 37Tools, Equipment and Workshop Maintenance

What does a paint thickness gauge reading that is much higher than the surrounding panels tell a technician during preparation?

  1. The spray gun was held too far from the surface
  2. There is likely to be old repair material or excess filler that must be identified before sanding Correct answer.
  3. The panel has been cleaned with the wrong solvent
  4. The panel is correctly prepared for refinishing

Explanation

A much higher reading indicates extra coating thickness, typically old filler or previous repair work, which must be identified before sanding or welding. Excess filler affects adhesion, panel fit and the choice of repair method.

Question 38Tools, Equipment and Workshop Maintenance

Which housekeeping routine best reduces fire risk in the paint mixing room?

  1. Sweeping solvent spills into the general waste bin
  2. Storing solvent-soaked rags in a closed metal bin and keeping containers sealed when not in use Correct answer.
  3. Leaving rags to dry on the bench overnight
  4. Storing solvents near the spray booth extraction intake

Explanation

Solvent-soaked rags can self-heat and ignite, so they are placed in a closed metal bin, and containers are kept sealed to limit vapour release. Solvent spills and rags must never be left loose or swept into general waste.

Question 39Tools, Equipment and Workshop Maintenance

A spray gun's air cap is removed for cleaning and the technician cannot recall the correct orientation of the horns. What is the safest course of action?

  1. Refit the cap according to the manufacturer's diagram and confirm the pattern on a test card Correct answer.
  2. Fit the cap upside down so the pattern is easier to see
  3. Leave the cap off and spray at reduced pressure
  4. Fit the cap in any position and test on a scrap panel

Explanation

The air cap horns must be oriented as the manufacturer specifies, otherwise the spray pattern becomes distorted. Refitting by the diagram and testing the pattern on a card confirms correct assembly before work on a vehicle.

Question 40Tools, Equipment and Workshop Maintenance

What is the correct way to dispose of waste thinners, gun-cleaning solvent and contaminated filters in a body shop?

  1. Store them in labelled containers and hand them to a licensed waste contractor Correct answer.
  2. Burn them in an open drum behind the workshop
  3. Place them in the general refuse skip
  4. Pour them down the workshop drain with plenty of water

Explanation

Solvent waste is hazardous and must be collected in labelled, closed containers and removed by a licensed waste contractor with the correct documentation. Draining, burning or placing it in general refuse is illegal and pollutes the environment.

Question 41Materials, Consumables and Surface Preparation

Before spray painting a repaired steel panel, what is the main purpose of applying a wax and grease remover?

  1. To abrade the old paint so the new coat grips
  2. To dissolve rust from the bare metal surface
  3. To fill small dents before primer is applied
  4. To remove oils and silicones that cause fish-eye and poor adhesion Correct answer.

Explanation

Wax and grease remover is a solvent blend that lifts oils, waxes and silicone contamination from the panel. If these contaminants remain, the paint cannot wet the surface properly and defects such as fish-eye or lifting appear. It does not cut rust, abrade paint or fill defects.

Question 42Materials, Consumables and Surface Preparation

Which abrasive grade removes paint and heavy defects most quickly from a panel?

  1. P1200 wet-or-dry paper
  2. P400 paper
  3. P240 paper
  4. P80 paper Correct answer.

Explanation

The lower the grit number, the coarser the abrasive and the faster it cuts material. P80 removes paint and heavy defects quickly but leaves deep scratches that must be refined. P240, P400 and P1200 are progressively finer and used for finishing.

Question 43Materials, Consumables and Surface Preparation

A technician is mixing body filler on a scrap panel. Why must the hardener paste be measured in the correct ratio to the filler?

  1. To make the filler waterproof
  2. To control the working time and final strength of the filler Correct answer.
  3. To reduce the amount of sanding needed later
  4. To change the colour of the filler to match the paint

Explanation

The hardener, usually a peroxide paste, starts the curing reaction of the polyester filler. Too little hardener leaves the filler soft and sticky, while too much shortens the working time and can make the filler brittle. The correct ratio gives a predictable pot life and a strong, fully cured repair.

Question 44Materials, Consumables and Surface Preparation

Which personal protective equipment is essential when mixing and spraying two-pack (2K) paints containing isocyanate hardener?

  1. A paper filter mask and short sleeves
  2. A dust mask and cotton gloves
  3. Safety goggles only
  4. An air-fed respirator and full skin coverage Correct answer.

Explanation

Isocyanate hardeners used in 2K paints can cause severe respiratory sensitisation and asthma. A supplied-air or air-fed respirator plus gloves and full skin coverage is required. Dust masks and paper filters do not protect against isocyanate vapour.

Question 45Materials, Consumables and Surface Preparation

What is the correct first step when preparing a new, unpainted steel panel for painting?

  1. Apply body filler directly to the bare metal
  2. Apply a sealer over the shiny metal
  3. Spray topcoat straight onto the panel
  4. Degrease and then abrade the surface to give a key Correct answer.

Explanation

New steel carries protective oils and a smooth surface that paint cannot grip. The panel must first be degreased, then abraded to create a mechanical key before any primer is applied. Skipping either step leads to poor adhesion and coating failure.

Question 46Materials, Consumables and Surface Preparation

Which defect is caused by spraying paint onto a surface contaminated with silicone?

  1. Sagging
  2. Dry spray
  3. Orange peel
  4. Fish-eye (small craters in the film) Correct answer.

Explanation

Silicone lowers the surface tension of the wet paint, so the film pulls away from contaminated spots and forms craters called fish-eye. Thorough cleaning with wax and grease remover prevents it. Orange peel, sagging and dry spray come from spray technique, not silicone.

Question 47Materials, Consumables and Surface Preparation

Which masking material is best for covering a large window while a car is being sprayed?

  1. Masking paper taped at the edges Correct answer.
  2. Aluminium foil pressed onto the glass
  3. A thin plastic sheet with no tape
  4. Newspaper taped directly to the glass

Explanation

Masking paper is designed to resist solvent bleed-through and gives a clean edge when taped down. Newspaper lets paint soak through and leaves print marks, while loose plastic and foil do not seal the edge reliably.

Question 48Materials, Consumables and Surface Preparation

What does the term 'pot life' mean for a mixed two-pack primer?

  1. The maximum thickness the primer can be applied
  2. The temperature at which the primer must be stored
  3. The time the mixed primer remains usable before it gels Correct answer.
  4. The time the primer takes to dry to the touch

Explanation

Once the base and hardener of a 2K product are mixed, the chemical reaction begins and the mixture gradually thickens and gels. This usable window is the pot life. Exceeding it means the product must be discarded, not thinned back into use.

Question 49Materials, Consumables and Surface Preparation

A technician wets the panel with a fine water mist after sanding primer and sees the surface turn dull and even. What is this check used for?

  1. Testing whether the primer is fully cured
  2. Checking for pinholes and surface imperfections Correct answer.
  3. Measuring the paint film thickness
  4. Checking the colour match of the topcoat

Explanation

Wetting the sanded surface reveals scratches and pinholes that the dry surface hides, because the water fills the defects and changes how light reflects. This guide-coat check lets the technician find imperfections before topcoat. It does not measure cure, thickness or colour.

Question 50Materials, Consumables and Surface Preparation

Which type of primer is designed to be applied directly to bare metal to provide corrosion protection and adhesion?

  1. Filler primer
  2. High-build primer
  3. Etch primer Correct answer.
  4. Clear lacquer

Explanation

Etch primer contains a mild acid that lightly attacks the bare metal, giving a chemical key and corrosion protection. Filler and high-build primers are used over prepared surfaces to fill and build, while clear lacquer is a topcoat.