Question 138Refrigeration/AC - 1st Asst/Chief70% to pass
What is the drive arrangement of refrigeration compressor shown in figure "B" of the illustration? Illustration GS-RA-41
AI Explanation
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.
Related Questions
#136 The carbon seal ring of a refrigeration compressor crankshaft mechanical seal is held in position against the stationary ring face by using what device? #137 The safety heads of most large reciprocating compressors used in refrigeration systems are held in place by what means? #139 A device used to hold open the refrigeration compressor suction valve during starting to reduce the compression load is called what? #140 If outside air at 80 degrees F and 70 percent relative humidity is conditioned, what will be the resulting dew point temperature of the air just before it comes into contact with the cooling coil? Illustration GS-RA-22 #141 For the proper control of the air temperature in an air conditioning system using chilled water circulation, which of the listed conditions should remain constant regardless of load changes?