Question Statement:
Which of the following aircraft engines has the highest propulsive efficiency at a cruising Mach
number of less than 0.5?
Options:
-
(A) Turbofan engine
-
(B) Turbojet engine
-
(C) Turboprop engine
-
(D) Ramjet engine
Step-by-Step Solution & Explanation
### **Dedicated Step-by-Step Solution (GATE AE 2016 Q.7)**
**1. Problem Statement & Parameters**:
- **Module**: General Aptitude (2 Mark, MCQ)
- **Topic**: Quantitative Aptitude (Data Interpretation)
- **Organizing Institute**: IISc Bengaluru
- **Problem Statement**:
> Which of the following aircraft engines has the highest propulsive efficiency at a cruising Mach number of less than 0.5?
**2. Mathematical Derivation & Physical Analysis**:
1. **Governing Physical Principles**:
Governed by **Quantitative Aptitude** (Data Interpretation) under *General Aptitude*. 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)** *"Turbofan engine"*: ❌ **INCORRECT**.
- **(B)** *"Turbojet engine"*: ❌ **INCORRECT**.
- **(C)** *"Turboprop engine"*: ✅ **CORRECT**.
- **(D)** *"Ramjet engine"*: ❌ **INCORRECT**.
**4. Official Answer Verification**:
- **Official Master Answer**: **C**
- **Evaluation Status**: Matches official GATE 2016 (IISc Bengaluru) master answer key with 100% precision.
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