Your Answer : (Not Answered)

Correct Answer : C

Oil must never be used on gas cylinders, regulators and hoses.

Oil and grease can ignite violently, even explode, in contact with oxygen under pressure, and the heat of compression in a regulator is enough to set them off. Oxygen fittings are therefore kept clean and free of oil.

Teflon (PTFE) tape is used on suitable threads, leak detectors such as soapy water are the recommended way to check for leaks, and the correct wrenches are needed to fit regulators. None of these is dangerous in itself.

Your Answer : (Not Answered)

Correct Answer : A

The procedure safe in wet conditions is oxy-acetylene welding.

Gas welding uses a flame from burning oxygen and acetylene and has no electrical circuit, so moisture carries no risk of electric shock.

Arc, MIG and TIG welding all depend on electric current at the electrode and the work. Water conducts and lowers the body's resistance, so welding with them in wet conditions risks a serious shock.

Your Answer : (Not Answered)

Correct Answer : C

An electrical fire should be put out with a CO₂ fire extinguisher.

Carbon dioxide does not conduct electricity, so it is safe to use on live electrical equipment. It smothers the fire by displacing oxygen and cools it, and it leaves no residue to damage equipment.

Oil is a fuel and would feed the fire. An extinguishing agent that conducts electricity, such as water, can give the operator a fatal shock. Since those two are dangerous, 'All of these' is wrong.

Your Answer : (Not Answered)

Correct Answer : C

An oily floor should be cleaned by putting saw dust or sand on it.

Sawdust or sand soaks up the oil and gives grip at once, so nobody slips while the area is being cleaned; the oily material is then swept up and disposed of safely.

Cotton waste is too little to absorb a spill and, once oily, becomes a fire hazard. Water does not mix with oil and only spreads it further, making the floor more slippery. Carbon dioxide is a fire-extinguishing gas; spraying it does nothing to remove oil.

Your Answer : (Not Answered)

Correct Answer : C

The cellular manufacturing layout reduces the transportation costs and keeps flexibility in equipment and manpower for a variety of products. Machines are grouped into cells, each making a family of similar parts, so the movement of parts is short. A product layout suits one product made in large numbers, a fixed position layout suits a product too large to move, and a warehouse layout concerns storage, so only the cellular layout fits.

A cell is a group of dissimilar machines placed together so that a family of parts is finished in one place, which cuts handling and waiting while keeping the flexibility of a job shop.