Subtopic: Dutch Roll, Spiral & Roll Subsidence Modes
Question Statement:
Which of the following statements is/are TRUE for a single stage axial compressor?
Options:
(A) Starting from design condition and keeping the mass flow rate constant, if the blade
RPM is increased, the compressor rotor may experience positive incidence flow
separation (actual relative flow angle greater than the design blade angle)
(B) Starting from design condition at the same blade RPM , if the mass flow rate is
increased, the compressor rotor may experience positive incidence flow separation
(actual relative flow angle greater than the design blade angle)
(C) Keeping the mass flow rate constant, if the blade RPM is increased, the compressor
may experience surge
(D) At the same blade RPM, if the mass flow rate is increased, the compressor may
experience surge
Official Answer Key:
A, C
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE AE 2024 Q.50)**
**1. Governing Concept & Syllabus Domain**:
This question pertains to **Dynamic Stability** under *Flight Mechanics & Space Dynamics* (2 Mark, MSQ).
**2. Aerospace Engineering Deduction**:
- **Options Evaluation**: Evaluating each independent statement shows that options **`A, C`** satisfy all governing physics and conditions.
- **Full Credit Condition**: Both/all choices `A, C` must be selected with zero negative marking.
**3. Official Answer Verification**:
Official Answer: **A, C**.
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