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CIH Hazardous Trades Questions with Solutions
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CIH Hazardous Trades
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CIH Hazardous TradesMetal Production (Foundry) - answer Production of Aluminum, Iron & Steel
Aluminum (Bauxite) Production - answer Exposure Concerns: Alumina Dust;
Particulate and Gaseous Flourides
Carbon Monoxide
Sulfur Dioxide
PAH
Heat Stress
Magnetic Fields
Vibration
Coal Tar Pitch Volatiles
Iron and Steel Production - answer Exposure Concerns:
Heat
Noise
Dusts from mining (Iron Oxide, Silica, Coke Oven Emissions
Metal Fumes (Iron Oxide, Lead Fume, Zinc Fume, Manganese)
Gases & Vapors (Flourides, CO, SO2, H2S, Ozone, NOx, Solvents Vapors)
Mists (Sulfuric Acid mist, Lead paints spray mist)
Abrasive Blasting - answerCleaning of metal surfaces using abrasive particles at high
velocity
Abrasive Blasting Exposures - answerBlasting Media (Silica, Alumina, Steel Shot)
Blasting Debris (Chromium, Nickel, Berryllium, Lead)
Noise over 110 dBA
Abrasive Blasting Controls - answerControls: Respirator APF (25 for Type C operating
in continous flow mode, 2000 operatingin pressure demand mode)
Pickling Description - answerDipping metal parts in open baths to remove oxides,
grease, oil and dirt
Types- Acid Pickling , Bright Dip & Molten caustic descaling
Hydroflouric Acid principle pickling agent
Pickling (Acid Cleaning of Metals) - answerHazards: NOx, Acid Mists, HF gas, HCl gas,
Cyanide Mist,
Exposure Pathways- Corrosive effects of accidental contact with skin, mucosa and eyes
Pickling Controls - answerControls- Dermal PPE, LEV, Foam on tank to control mists
, Alkali Cleaning of Metals - answerExposures- Caustic mists from electroplating the bath
Sodium Silicate, Caustic Soda, Trisodium Phosphate, Soda Ash
Contols- Foam blanket on Alkaline bath
Metal Degreasing - answerRemoving grease, oil and dirt from metal and plastics with
solvents and cleansers
Controls:
Hazards-
Cold Degreasing - answerUse of petroleum distillates to aromatic solvents
Cold Degreasing Controls - answerAirless nozzle to minmize aerosols, Local Exhaust
Ventilation
Cold Degreasing Hazards - answerMethylene Chloride, Perchloroethylene,
Trichloroethylene
Cold Degreasing Health Effects - answerDermititis, Cancer from Solvents, Explosion,
Fire, CO metabolized from Exposure to Methylene Chloride
Vapor Degreasing Controls - answerTemperature controls on the degreasing tank,
Minimal Crossdrafts
Vapor Degreasing Hazards - answerTCE, Methyl Chloroform, Ethylene Dichloride
Vapor Degreasing Effects - answerThermal degradation of chemicals can form
phosgene, HCl and Cl2 gases
Welding - answerthe source of respirable fume (0.01 to 0.1 microns) can either be the
basemetal, the metal coating, the electrode, or the fluxing agent.
Brazing - answerGas Welding
Hazards: Metal Fume and Nitrogen Dioxide
One Liner: Will cause high concentrations of NO2 to form in confined spaces
Cadmium brazing - answeras the temperature of the brazing operation increases the
likelihood of cadmium exposures increases.
Gas Welding - answerthe heat of fusion is obtained from the combustion of oxygen and
one of several gasses, usually acetylene. The flame melts the workpiece and the filler
metal is manually fed into the joint.
Plasma Arc Welding - answerthe welding head is designed to provide a gas (argon) flow
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