Question 138Refrigeration & AC - 1st Asst/Chief

The correct answer is B) welded, fully hermetic. The illustration GS-RA-41 likely depicts a refrigeration compressor arrangement. In a fully hermetic compressor, the compressor and motor are enclosed in a welded steel shell, creating a completely sealed unit. This design is more efficient and reliable than an open or semi-hermetic arrangement, as it prevents any potential leaks. The fully hermetic, welded construction makes this type of compressor well-suited for the maritime environment and the requirements of the US Coast Guard Captain's License Examinations. The other options are incorrect because: A) external-drive compressors have the motor separate from the compressor; C) open compressors have an exposed design that is less suitable for marine applications; and D) semi-hermetic compressors, while more accessible for service, do not provide the same leak-proof integrity as a fully hermetic design.