What is the disadvantage of a dual-entry centrifugal compressor compared to a single-entry centrifugal compressor?

Correct Answer: Option D — The dual-entry compressor utilizes a more complicated inlet ducting.

Dual-entry centrifugal compressors allow for a larger mass flow rate without increasing the impeller diameter. However, the primary disadvantage is the requirement for complex inlet ducting to split the airflow and feed both sides of the impeller, which increases the installation footprint and maintenance complexity compared to single-entry designs.