Aerospace Engineering GATE 2025 Questions with Answer

Ques 40 General Aptitude

A regular dodecagon (12-sided regular polygon) is inscribed in a circle of radius r cm as shown in the figure. The side of the dodecagon is d cm. All the triangles (numbered 1 to 12) in the figure are used to form squares of side r cm and each numbered triangle is used only once to form a square.
The number of squares that can be formed and the number of triangles required to form each square, respectively, are:
Note: The figure shown is representative.

Ques 41 General Aptitude

If a real variable x satisfies 3^x2=27×9^x then the value of 2^x2/(2^x)² is:

Ques 42 General Aptitude

The number of patients per shift (X) consulting Dr. Gita in her past 100 shifts is shown in the figure. If the amount she earns is ¥1000(X-0.2), what is the average amount (in ¥) she has earned per shift in the past 100 shifts?
Note: The figure shown is representative.

Ques 43 Propulsion

In a centrifugal compressor, the eye tip diameter is 10 cm. For a shaft rotational speed of 490 rotations per second, the tangential speed at the inducer tip is ______ m/s (rounded off to one decimal place).

Ques 44 Propulsion

A perfect gas flows through a frictionless constant-area duct with heat addition. The inlet conditions are as follows: pressure 100 kPa, density 1 kg/m³, and velocity 100 m/s. At a particular downstream location, the gas velocity is 200 m/s. The static pressure at the downstream location is ______ kPa (answer in integer).

Ques 45 Propulsion

δQ and δW are the heat and work interactions of a system with its surroundings, and du is the change in the internal energy of the system. For an adiabatic process in a closed, constant pressure combustor, which one of the following options is correct?

Ques 46 Propulsion

An ideal two-stage rocket has identical specific impulse and structural coefficient for its two stages. For an optimized rocket, the two stages have identical payload ratio as well. The payload is 2 tons and the initial mass of the rocket is 200 tons. The mass of the second stage of the rocket (including the final payload mass) is ______ tons.

Ques 47 Propulsion

A gaseous fuel mixture comprising 3 moles of methane and 2 moles of ammonia is combusted in X moles of pure oxygen in stoichiometric amount. Assuming complete combustion, with only CO₂, H₂O and N₂ in the product gases, the value of X is
3 CH₄+2 NH₃+X O₂ → Products (CO₂, H₂O, N₂)

Ques 48 Space Mechanics

F and G denote two points on a spacecraft's orbit around a planet, as indicated in the figure. O is the center of the planet, P is the periapsis, and the angles are as indicated in the figure. If OF=8000 km, OG=10000 km, θ_F=0 deg, and θ_G=60 deg, the eccentricity of the spacecraft's orbit is ______ (rounded off to two decimal places).

Ques 49 Structures

A 1 m long rod is to be designed to support an axial tensile load P (P>> weight of the rod). The material for the rod is to be chosen from one of the four provided in the table. Using strength-based failure criterion for design, which material results in the lowest weight of the rod?

Ques 50 Structures

For a homogeneous, isotropic material, the relation between the shear modulus (G), Young's modulus (E), and Poisson's ratio (v) is

Ques 51 Structures

A simply supported horizontal beam is subjected to a distributed transverse load varying linearly from q₀ at A to zero at B, as shown in the figure. Which one of the following options is correct?

Ques 52 Structures

A stress field is given by σ_xx=σ_zz=C₁y, σ_yy=C₂y, τ_xy=τ_yz=τ_zx=0, where C₁ and C₂ are non-zero constants. If the stress field satisfies equilibrium, which one of the following options is correct?