In a two-spool gas turbine, what do N1 and N2 refer to?

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Prepare for the Gas Turbine Systems Technician – Mechanical A School Test 1. Study with multiple choice questions that come with hints and explanations. Ace your exam!

Multiple Choice

In a two-spool gas turbine, what do N1 and N2 refer to?

Explanation:
In a two-spool gas turbine, there are two separate rotating shafts: a low‑pressure (LP) spool and a high‑pressure (HP) spool. The speeds are designated as N1 for the LP compressor spool and N2 for the HP compressor spool. The LP spool drives the LP compressor (and related stages), while the HP spool drives the HP compressor (and related stages) and often powers the generator as well. That’s why the correct understanding is that N1 is the LP spool speed and N2 is the HP spool speed. The other options mix up which spool each speed refers to or refer to turbine, fan, or exhaust speeds, which aren’t what N1 and N2 denote.

In a two-spool gas turbine, there are two separate rotating shafts: a low‑pressure (LP) spool and a high‑pressure (HP) spool. The speeds are designated as N1 for the LP compressor spool and N2 for the HP compressor spool. The LP spool drives the LP compressor (and related stages), while the HP spool drives the HP compressor (and related stages) and often powers the generator as well. That’s why the correct understanding is that N1 is the LP spool speed and N2 is the HP spool speed. The other options mix up which spool each speed refers to or refer to turbine, fan, or exhaust speeds, which aren’t what N1 and N2 denote.

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