Consider the following statements pertaining to axial flow compressors.
1. Like centrifugal compressor, axial flow compressors are limited by surge at low mass flow rates.
2. Axial flow compressors experience checking at low flow rates
3. The design point of axial flow compressors is close to the surge limit.
4. As mass flow diminishes the compressor blades stall causing flow separation.
Which of these statements is/are correct?
(a) 1 and 2 only (b) 1,2 and 3
(c) 1, 3 and 4 (d) 3 and 4 only