The answer is the last one (or D): welded, hermetic.
Explanation for each option:
a. Welded, semihermetic: This option is incorrect because semihermetic compressors are typically used in commercial applications where the compressor can be disassembled for maintenance. Domestic appliances usually do not use semihermetic compressors.
b. Flanged, hermetic: This option is incorrect because flanged compressors are not commonly used in domestic appliances. Hermetic compressors are used, but they are usually welded rather than flanged.
c. Flanged, semihermetic: This option is incorrect for the same reasons as options a and b. Semihermetic compressors are not typical for domestic appliances, and flanged designs are not common in this context.
d. Welded, hermetic: This option is correct because domestic refrigerators and freezers typically use hermetic compressors that are welded shut. This design is more cost-effective and reliable for household appliances, as it does not require maintenance and is sealed to prevent refrigerant leaks.
Summary:
The type of compressor typically found on a domestic appliance is a welded, hermetic compressor. This design is chosen for its reliability, cost-effectiveness, and maintenance-free operation, making it ideal for household use.