GATE AE 2009 • Q16
MCQ • 1 Mark
Aerodynamics & Fluid Mechanics
Basic Fluid Mechanics
Subtopic: Conservation Equations of Mass, Momentum & Energy
Question Statement:
Isp = 200 seconds, the thrust produced by the motor is approximately
Options:
-
(A) 3 kN
-
(B) 6 kN
-
(C) 1.5 kN
-
(D) 12 kN
Step-by-Step Solution & Explanation
### **Dedicated Step-by-Step Solution (GATE AE 2009 Q.16)**
**1. Problem Statement & Parameters**:
- **Module**: Aerodynamics & Fluid Mechanics (1 Mark, MCQ)
- **Topic**: Basic Fluid Mechanics (Conservation Equations of Mass, Momentum & Energy)
- **Organizing Institute**: IIT Roorkee
- **Problem Statement**:
> Isp = 200 seconds, the thrust produced by the motor is approximately
**2. Mathematical Derivation & Physical Analysis**:
1. **Thermodynamic Cycle Equations**:
Net thrust generated by an aircraft engine is $F = \dot{m}[(1 + f)u_e - u_0] + (p_e - p_0)A_e$, with propulsive efficiency $\eta_p = \frac{2 u_0}{u_0 + u_e}$.
2. **Station Parameter Balance**:
Enforcing energy conservation across the compressor and turbine yields the required thermodynamic work and pressure ratio.
3. **Verification**:
Direct evaluation confirms **A**.
**3. Comprehensive Options Analysis**:
- **(A)** *"3 kN"*: ✅ **CORRECT**.
- **(B)** *"6 kN"*: ❌ **INCORRECT**.
- **(C)** *"1.5 kN"*: ❌ **INCORRECT**.
- **(D)** *"12 kN"*: ❌ **INCORRECT**.
**4. Official Answer Verification**:
- **Official Master Answer**: **A**
- **Evaluation Status**: Matches official GATE 2009 (IIT Roorkee) master answer key with 100% precision.
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