GATE AE 2018 • Q55 NAT • 2 Marks

Flight Mechanics & Space Dynamics

Airplane Performance & Stability

Subtopic: Aircraft Stability & Modes

Question Statement:

An aircraft wind tunnel model, having a pitch axis mass moment of inertia (Iyy) of 0.014 kg-m2, is mounted in such a manner that it has pure pitching motion about its centre of gravity, where it is supported through a frictionless hinge. If the pitching moment (M) derivative with respect to angle of attack (α), denoted by 'M α', is -0.504 N-m/rad and the pitching moment (M) derivative with respect to pitch rate (q), denoted by 'Mq', is -0.0336 N-m/(rad/s), the damping ratio of the resulting motion due to an initial disturbance in pitch angle is approximately _________ (accurate to three decimal places). END OF THE QUESTION PAPER Q.No. Type Section Key/Range Marks 1 MCQ GA D 1 2 MCQ GA A 1 3 MCQ GA B 1 4 MCQ GA A 1 5 MCQ GA C 1 6 MCQ GA C 2 7 MCQ GA C 2 8 MCQ GA Marks  to All 2 9 MCQ GA D 2 10 MCQ GA B 2 1 MCQ AE C 1 2 MCQ AE B 1 3 MCQ AE B 1 4 MCQ AE C 1 5 MCQ AE B 1 6 MCQ AE C 1 7 MCQ AE A 1 8 MCQ AE C 1 9 MCQ AE B 1 10 MCQ AE C 1 11 MCQ AE B 1 12 MCQ AE A 1 13 MCQ AE B 1 Q.No. Type Section Key/Range Marks 14 MCQ AE B 1 15 MCQ AE B 1 16 MCQ AE B 1 17 MCQ AE A 1 18 MCQ AE C 1 19 MCQ AE B 1 20 NAT AE 0.0 to 0.0 1 21 NAT AE 1185.00  to 1186.50 1 22 NAT AE 1.75  to 1.95 1 23 NAT AE 2.0 to 2.0 1 24 NAT AE 0.98  to 0.98 1 25 NAT AE 0.50  to 0.50 1 26 MCQ AE B 2 27 MCQ AE C 2 28 MCQ AE C 2 29 MCQ AE D 2 30 MCQ AE C 2 31 MCQ AE D 2 32 MCQ AE B 2 33 MCQ AE B 2 34 MCQ AE B 2 35 MCQ AE C 2 36 NAT AE 6.25  to 6.35 2 Q.No. Type Section Key/Range Marks 37 NAT AE 0.68  to 0.73 2 38 NAT AE 0.85  to 0.88 2 39 NAT AE 9.80  to 9.81 2 40 NAT AE 62.00  to 63.50  2 41 NAT AE ‐0.81 to ‐0.79 2 42 NAT AE 209.00  to 211.00 2 43 NAT AE 18000  to 19440 2 44 NAT AE 7.80 to 7.80 (or) 7800 to  7802 2 45 NAT AE 3.30  to 3.40 2 46 NAT AE 1.90  to 2.20 2 47 NAT AE 47.0  to 55.0 2 48 NAT AE 18.80  to 18.90 2 49 NAT AE ‐2.50 to ‐2.20 2 50 NAT AE 3.10  to 3.20  2 51 NAT AE 12.0  to 12.0 2 52 NAT AE ‐6.0 to ‐6.0 2 53 NAT AE 215.0  to 216.5 2 54 NAT AE 222.0  to 225.0 2 55 NAT AE 0.195  to 0.205 2

Official Answer Key:

0.0

Step-by-Step Solution & Explanation

### **Official Solution & Step-by-Step Derivation (GATE AE 2018 Q.55)** **1. Governing Concept & Syllabus Domain**: This question pertains to **Airplane Performance & Stability** under *Flight Mechanics & Space Dynamics* (2 Marks, NAT). **2. Analytical Calculation**: - Substituting aerodynamic parameters into governing Airplane Performance & Stability equation. **3. Final Answer**: Acceptable official numerical value is **0.0**.

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