Aerospace Engineering Gate 2018 Questions with Answer

Ques 40 GATE 2018

A clamped-clamped beam, subjected to a point load P at the midspan, is shown in the figure below. The magnitude of the moment reaction at the two fixed ends of the beam is

Ques 41 GATE 2018

Which of the following statement(s) is/are true about the state of a body in plane strain condition?
P: All the points in the body undergo displacements in one plane only, for example the x-y plane, leading to ε_zz=γ_xz=γ_yz=0
Q: All the components of stress perpendicular to the plane of deformation, for example the x-y plane, of the body are equal to zero, i.e. σ_zz=τ_xz=τ_yz=0
R: Except the normal component, all the other components of stress perpendicular to the plane of deformation of the body, for example the x-y plane, are equal to zero, i.e. σ_zz≠0, τ_xz=τ_yz=0

Ques 42 GATE 2018

A thin-walled tube with external radius of 100 mm and wall thickness of 2 mm, is fixed at one end. It is subjected to a compressive force of 1 N acting at a point on the circumference parallel to its length. The maximum normal stress (in kPa) experienced by the structure is ________ (accurate to two decimal places).

Ques 43 GATE 2018

A 1 m long massless cantilever beam oscillates at 2Hz, while a 60 kg mass is attached at the tip of it. The flexural rigidity of the beam (in kN-m² is ________ (accurate to two decimal places).

Ques 44 GATE 2018

A cantilever beam having a rectangular cross-section of width 60 mm and depth 100 mm, is made of aluminum alloy. The material mechanical properties are: Young's modulus, E=73 GPa and ultimate stress, σ_u=480 MPa. Assuming a factor of safety of 4, the maximum bending moment (in kN-m) that can be applied on the beam is ________ (accurate to one decimal place).

Ques 45 GATE 2018

The components of stress in a body under plane stress condition, in the absence of body forces, is given by:
σ_xx=Ax²; σ_yy=12x²−6y² and σ_xy=12xy.
The coefficient, A, such that the body is under equilibrium is ________ (accurate to one decimal place).

Ques 46 GATE 2018

The first law of thermodynamics is also known as conservation of

Ques 47 GATE 2018

In an ideal gas turbine cycle, the expansion in a turbine is represented by

Ques 48 GATE 2018

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).

Ques 49 GATE 2018

For a damped single degree of freedom system with damping ratio of 0.1, ratio of two successive peak amplitudes of free vibration is ________ (accurate to two decimal places).

Ques 50 GATE 2018

The natural frequency (in rad/s) of the spring-mass system shown in the figure below is ________ (accurate to one decimal place).

Ques 51 GATE 2018

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 ________ (accurate to two decimal places).

Ques 52 GATE 2018

A combustor is operating with a fuel-air ratio of 0.03. If the stoichiometric fuel-air ratio of the fuel used is 0.06, the equivalence ratio of the combustor will be ________ (accurate to two decimal places).