What does N2 indicate in turbojet engines?

What does N2 indicate in turbojet engines?

• A. Speed of the low pressure turbine
• B. Speed of the high pressure compressor
• C. Overall engine performance
• D. Thrust output of the engine

Answer: (B)

The indication of N2 in turbojet engines refers specifically to the rotational speed of the high-pressure compressor. In turbojet and turbofan engines, the engine is typically divided into two main parts: the low-pressure section and the high-pressure section. The N2 speed relates to the high-pressure compressor and turbine, which play crucial roles in compressing the air before it enters the combustion chamber. Monitoring N2 is vital for understanding the performance and efficiency of the engine during operation, as it directly impacts the engine's ability to generate thrust. Proper functioning of the high-pressure compressor ensures that adequate amounts of air are available for combustion, which in turn is essential for maintaining thrust output and engine performance. While the other options represent important aspects of engine operation, they do not accurately define what N2 signifies in this context. Speed of the low-pressure turbine relates to another parameter typically designated as N1, overall engine performance is a broader term that encompasses multiple metrics including thrust and efficiency, and thrust output itself would be determined by various factors, not just N2 alone.

The indication of N2 in turbojet engines refers specifically to the rotational speed of the high-pressure compressor. In turbojet and turbofan engines, the engine is typically divided into two main parts: the low-pressure section and the high-pressure section. The N2 speed relates to the high-pressure compressor and turbine, which play crucial roles in compressing the air before it enters the combustion chamber.

Monitoring N2 is vital for understanding the performance and efficiency of the engine during operation, as it directly impacts the engine's ability to generate thrust. Proper functioning of the high-pressure compressor ensures that adequate amounts of air are available for combustion, which in turn is essential for maintaining thrust output and engine performance.

While the other options represent important aspects of engine operation, they do not accurately define what N2 signifies in this context. Speed of the low-pressure turbine relates to another parameter typically designated as N1, overall engine performance is a broader term that encompasses multiple metrics including thrust and efficiency, and thrust output itself would be determined by various factors, not just N2 alone.