Each stage of an axial-compressor of a gas turbine can compress the atmospheric air a total of how many times?

Correct Answer: Option C — 1.2 times

Axial-flow compressor stages are designed for high efficiency with relatively low pressure ratios per stage. Typically, each stage achieves a pressure ratio of approximately 1.2:1. This incremental compression allows for a multi-stage design that avoids excessive air heating and aerodynamic stalling within the compressor.