What feature characterizes a double entry centrifugal compressor?

What feature characterizes a double entry centrifugal compressor?

• A. Vanes on both sides of the impeller
• B. Vanes on one side of the impeller
• C. A single-stage impeller
• D. No vanes around the impeller

Answer: (C)

A double-entry centrifugal compressor is defined by feeding flow into the impeller from two opposite sides, which increases the throughput for a given speed. In practice, this arrangement is most commonly implemented with a single-stage impeller, meaning there is one impeller doing the compression in one pass while the flow enters from both sides. This is why a single-stage impeller is the best-fitting feature for a double-entry design. The other options describe blade placement or the presence/absence of vanes, which do not define the double-entry concept and can occur in other configurations.

A double-entry centrifugal compressor is defined by feeding flow into the impeller from two opposite sides, which increases the throughput for a given speed. In practice, this arrangement is most commonly implemented with a single-stage impeller, meaning there is one impeller doing the compression in one pass while the flow enters from both sides. This is why a single-stage impeller is the best-fitting feature for a double-entry design. The other options describe blade placement or the presence/absence of vanes, which do not define the double-entry concept and can occur in other configurations.