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19 Cards in this Set
- Front
- Back
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A tool rest on a fix grinder must be? |
Set to a maximum of 3mm from the face of the wheel |
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Which type of radiant energy can cause welding flash? |
Ultraviolet rays (uv rays) |
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Hearing protection should be worn when the noise level is above what decibels? |
85 decibels |
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When oxygen reacts with ultraviolet light from welding, the gas produced is ? |
Ozone |
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What shade of filter plate is recommended for medium amperage gmaw welding? |
11 |
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What device breaks the current flow while still at a low level to protect people from electrical shock |
Ground Fault Circuit Interrupter(GFCI) |
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Before entering a vessel to perform any kind of work. You should insist on testing the vessel for ? |
Fumes, oxygen levels |
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When working in a confined space, which, the oxygen level must be between? |
19.5-23% by volume |
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When working in a confined space. It is highly recommended that cutting torches be ignited and extinguished where? |
Outside the confined space |
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Permanent eye damage is in form of cataracts or retinal damage may be caused by over exposure to ? |
Infrared light rays |
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Which poisonous gas can be created for welding around or near chlorinated hydrocarbon degreasers agents? |
Phosgene gas ( created by ultraviolet radiation from the welding arc) |
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Which metal type, when heated or welded , can produce metal fume fever if the fumes are inhaled |
Zinc |
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A load on a scaffold must not exceed what percent of the designed load for the scaffold ? 50% 35% 15% 25% |
25% |
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A vessel that contains fammable substances,fumes, can be made safe by performing what ? |
Steaming throughly and welding while it's still hot and full of steam |
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Hydrogen sulphide gas concentrated as low as 0.07% (700ppm) may cause? |
Unconsciousness or death |
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The first line of defence against welding fumes and gases is? |
To weld outside |
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The employer shall ensure that cylinders containing acetylene are? |
Secured in the vertical position |
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One of the most common workshop hazards are? |
Noise level |
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What must be done where the general public is exposed to harmful welding rays |
Put welding screens and signs up |
