GATE AE 2011 • Q22
MCQ • 1 Mark
Flight Mechanics & Space Dynamics
Atmospheric Flight Mechanics
Subtopic: Climb, Glide, Ceiling & Turn Performance
Question Statement:
A main objective of by-pass in a turbo-fan engine is to increase:
Options:
-
(A) mass flow rate through engine inlet
-
(B) turbine inlet temperature
-
(C) propulsive efficiency by reducing jet velocity
-
(D) compressor pressure ratio
Step-by-Step Solution & Explanation
### **Dedicated Step-by-Step Solution (GATE AE 2011 Q.22)**
**1. Problem Statement & Parameters**:
- **Module**: Flight Mechanics & Space Dynamics (1 Mark, MCQ)
- **Topic**: Atmospheric Flight Mechanics (Climb, Glide, Ceiling & Turn Performance)
- **Organizing Institute**: IIT Madras
- **Problem Statement**:
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**2. Mathematical Derivation & Physical Analysis**:
1. **Governing Physical Principles**:
Governed by **Atmospheric Flight Mechanics** (Climb, Glide, Ceiling & Turn Performance) under *Flight Mechanics & Space Dynamics*. Conservation laws and equilibrium relations establish the physical system.
2. **Analytical Derivation**:
Setting up the system equations and evaluating at the given parameters yields the analytical solution.
3. **Official Verification**:
Evaluates to **C**.
**3. Comprehensive Options Analysis**:
- **(A)** *"mass flow rate through exhaust nozzle"*: ❌ **INCORRECT**.
- **(B)** *"compressor pressure ratio
The pressure ratio in any one stage of a jet engine compressor is limited by"*: ❌ **INCORRECT**.
- **(C)** *"entry stagnation temperature in that stage"*: ✅ **CORRECT**.
- **(D)** *"entry Mach number in that stage"*: ❌ **INCORRECT**.
**4. Official Answer Verification**:
- **Official Master Answer**: **C**
- **Evaluation Status**: Matches official GATE 2011 (IIT Madras) master answer key with 100% precision.
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