Q. An axial compressor that generates a stagnation pressure ratio of 4.0, operates with inlet and exit stagnation temperatures of 300 K and 480 K, respectively. If the ratio of specific heats (𝛾) is 1.4, the isentropic efficiency of the compressor is (A) 0.94 (B) 0.81 (C) 0.72 (D) 0.63 Ans: 0.81
Q. A solid circular shaft of diameter d is under pure torsion of magnitude T. The maximum tensile stress experienced at any point on the shaft is Ans: Option D
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Q. A thin airfoil is mounted in a low-speed, subsonic wind tunnel, in which the Mach number is 0.1. At a point on the airfoil, the pressure coefficient is measured to be –1.2. If the flow velocity is increased such that the free-stream Mach number is 0.6, the pressure coefficient at the same point on
Q. The relation between pressure (p) and velocity (V) for a steady, isentropic flow at two points along a streamline is, (c is a constant) Ans: Option C
Q. The stagnation pressures at the inlet and exit of a subsonic intake are 100 kPa and 98 kPa, respectively. The pressure recovery of this intake will be Ans: 0.50 to 0.50
Q. For a damped single degree of freedom system with damping ratio of 0.1, ratio of two successive peak amplitudes of free vibration is Ans: 1.75 to 1.95
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Q. The theoretical maximum velocity (in m/s) of air expanding from a reservoir at 700 K is (accurate to two decimal places). Specific heat of air at constant pressure is 1005 J/(kg-K). Ans: 1185.00 to 1186.50
Q. In an ideal gas turbine cycle, the expansion in a turbine is represented by (A) an isenthalpic process. (B) an isentropic process. (C) an isobaric process. (D) an isochoric process. Ans: an isentropic process.
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Q. The first law of thermodynamics is also known as conservation of (A) mass. (B) momentum. (C) energy. (D) species. Ans: energy
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![Determine the correctness or otherwise of the following statements, [a] and [r]](https://www.gkseries.com/blog/wp-content/uploads/2023/09/Determine-the-correctness-or-otherwise-of-the-following-statements-a-and-r-1024x536.jpg)
Q. Determine the correctness or otherwise of the following statements, [a] and [r]: [a] A closed-section box beam configuration is used in aircraft wings. [r] Closed-section box beam configuration is capable of resisting torsional loads. (A) Both [a] and [r] are true and [r] is the correct reason for [a]. (B) Both [a] and [r]
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