Which term describes the engine arrangement where the compressor and power section share a single driveshaft?

Which term describes the engine arrangement where the compressor and power section share a single driveshaft?

• A. Direct Shaft Turbine
• B. Dual Rotor
• C. Disk Area
• D. Drag

Answer: (A)

The main idea is understanding how the compressor and the power section are driven. When they share a single driveshaft, the engine is a single-spool or direct-drive arrangement, so the compressor and the power section rotate together on one shaft. This is described by the term Direct Shaft Turbine. It contrasts with multi-spool designs where separate shafts allow different rotational speeds for the compressor and the power section, improving efficiency across operating ranges. The other terms don’t describe how the compressor and power section are connected: Dual Rotor implies two shafts, Disk Area is a geometric term, and Drag refers to resistance rather than engine shaft arrangement.

The main idea is understanding how the compressor and the power section are driven. When they share a single driveshaft, the engine is a single-spool or direct-drive arrangement, so the compressor and the power section rotate together on one shaft. This is described by the term Direct Shaft Turbine. It contrasts with multi-spool designs where separate shafts allow different rotational speeds for the compressor and the power section, improving efficiency across operating ranges. The other terms don’t describe how the compressor and power section are connected: Dual Rotor implies two shafts, Disk Area is a geometric term, and Drag refers to resistance rather than engine shaft arrangement.