question_answer

Consider the following statements regarding the axial flow in an air compressor:

1. Surging is a local phenomenon while stalling affects the entire compressor.

2. Stalling is a local phenomenon while surging affects the entire compressor.

3. The pressure ratio of an axial compressor stage is smaller than that of a centrifugal compressor stage.

Of these statements:

A) 1, 2 and 3 are correct

B) 1 and 2 are correct

C) 2 and 3 correct

D) 1 and 3 correct