26.   Compartments that contain compressed gases are ventilated for what length of time if ventilation has been secured? 1. 5 minutes 2.   10 minutes 3.   15 minutes 4.   20 minutes 27.   Oxygen and chlorine cylinders may be stored in close proximity (near) to fuel or gas cylinders. 1.   True 2.   False 28.   Only trained and medically qualified personnel are authorized to remove asbestos. 1.   True 2.   False 29.   A tool is classified as power-driven if it has which of the following power sources? 1.   Pneumatic 2.   Hydraulic 3.   Electrical 4.   Each of the above 30.   Personnel assigned to a fire watch during a welding operation must remain at their location for what minimum length of time after the job is completed? 1.   10 minutes 2.   20 minutes 3.   30 minutes 4.   40 minutes 31.   When operating rotating machinery, you should never wear which of the following items? 1.   Jewelry 2.   Neckties 3.   Loose-fitting clothes 4.   All of the above 32.   Compressed air can be used to clean disassembled machinery parts provided the pressure doesn’t exceed how many pounds per square inch (psi)? 1.   30 psi 2.   45 psi 3.   60 psi 4.   75 psi 33.   Sewage wastes contain bacteria and viruses. They can enter your body through which of the following means? 1.   Your nose 2.   Your mouth 3.   Open sores 4.   All of the above 34.   You should not use liquid soaps or scented disinfectants to clean up spilled sewage for what reason? 1.   They cause too many suds 2.   They have poor cleaning characteristics 3.   They may temporarily disguise inadequate clean-up procedures 35.   You shouldn’t smoke around sewage-handling equipment for what reason? 1.   Germs found in the sewage can be inhaled 2.   Smoke adds to the odor 3.   Gases found around equipment and given off by sewage are explosive 36.   Continuous exposure to high-level noises could cause which of the following kinds of hearing loss? 1.   Temporary 2.   Permanent 3.   Both 1 and 2 above 37.   When working in machinery rooms and repair shops, you may be required to wear double-hearing protection. 1.   True 2.   False 38.   When driving or riding in a Navy vehicle, you are required to wear seat belts. 1.   True 2.   False 39.   Which of the following precautions should you follow when lifting heavy objects? 1.   Keep the load close to the center of your body 2.   Pull the load toward you; then lift gradually 3.   If too heavy to lift alone, get help 4.   All of the above 68