(Mechanics MCQs Aeronautical Engineering

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Newton’s first law of motion states that an object at rest will stay at rest unless acted on by: a) A balanced force b) An unbalanced force c) Gravity d) Friction Answer: b) An unbalanced force The SI unit of force is: a) Joule b) Watt c) Newton d) Pascal Answer: c) Newton The center of mass of a system of particles is: a) The average position of all the particles b) The point where the total mass can be considered to be concentrated c) Always at the geometric center d) The point where the gravitational force acts Answer: b) The point where the total mass can be considered to be concentrated Work done by a force is zero when: a) The force acts perpendicular to the direction of motion b) The object moves in the direction of the force c) The object moves opposite to the direction of the force d) The force acts parallel to the direction of motion Answer: a) The force acts perpendicular to the direction of motion The acceleration of a body in free fall under gravity is: a) Independent of mass b) Dependent on mass c) Dependent on surface area d) Dependent on volume Answer: a) Independent of mass In an elastic collision, which of the following is conserved? a) Kinetic energy only b) Momentum only c) Both kinetic energy and momentum d) Neither kinetic energy nor momentum Answer: c) Both kinetic energy and momentum The escape velocity from Earth is approximately: a) 7.9 km/s b) 11.2 km/s c) 15.0 km/s d) 3.2 km/s Answer: b) 11.2 km/s Hooke’s law describes the relationship between: a) Stress and strain b) Force and velocity c) Mass and acceleration d) Displacement and velocity Answer: a) Stress and strain Dynamics and Kinematics The angular velocity of a rotating object is defined as: a) The rate of change of angular displacement b) The rate of change of angular momentum c) The rate of change of linear velocity d) The rate of change of moment of inertia Answer: a) The rate of change of angular displacement The principle of conservation of angular momentum states that: a) The total angular momentum remains constant if no external torque acts on the system b) The total angular momentum is zero in an isolated system c) The total angular momentum is always conserved d) Angular momentum is proportional to mass Answer: a) The total angular momentum remains constant if no external torque acts on the system The Coriolis effect is a result of: a) Earth’s rotation b) Gravitational forces c) Air resistance d) Magnetic forces Answer: a) Earth’s rotation If a body is in equilibrium, the net force acting on it must be: a) Zero b) Maximum c) Equal to its weight d) Equal to its mass Answer: a) Zero A body moving in a circular path with constant speed has: a) Constant velocity b) Changing velocity c) Constant acceleration d) Zero acceleration Answer: b) Changing velocity The centripetal force acting on a body in circular motion is directed: a) Away from the center of the circle b) Toward the center of the circle c) Tangential to the circle d) Opposite to the direction of motion Answer: b) Toward the center of the circle The moment of a force is the product of: a) Force and distance from the pivot b) Force and time c) Force and velocity d) Force and acceleration Answer: a) Force and distance from the pivot In projectile motion, the horizontal component of velocity: a) Remains constant b) Increases with time c) Decreases with time d) Depends on the angle of projection Answer: a) Remains constant The range of a projectile is maximum when the angle of projection is: a) 30 degrees b) 45 degrees c) 60 degrees d) 90 degrees Answer: b) 45 degrees The gyroscopic effect is important in the stability of: a) Aircraft b) Submarines c) Automobiles d) Bicycles Answer: a) Aircraft Aerodynamics and Flight Mechanics Lift in an aircraft is generated due to: a) Pressure difference between the upper and lower surfaces of the wing b) High pressure above the wing c) High temperature of the wing d) Low pressure below the wing Answer: a) Pressure difference between the upper and lower surfaces of the wing The drag force acting on an aircraft is: a) Opposite to the direction of motion b) Perpendicular to the direction of motion c) In the same direction as the lift force d) Equal to the weight of the aircraft Answer: a) Opposite to the direction of motion The angle of attack in an aircraft wing is the angle between: a) The chord line of the wing and the relative airflow b) The wing and the ground c) The fuselage and the ground d) The wing and the horizontal tail Answer: a) The chord line of the wing and the relative airflow Stalling of an aircraft occurs when: a) The angle of attack exceeds a critical value b) The speed of the aircraft is too high c) The drag force is minimized d) The lift force is equal to the weight of the aircraft Answer: a) The angle of attack exceeds a critical value The Reynolds number is a dimensionless quantity used to predict: a) Flow patterns in fluid dynamics b) The lift coefficient of an aircraft c) The structural strength of materials d) The thermal conductivity of fluids Answer: a) Flow patterns in fluid dynamics Thrust in a jet engine is produced by: a) Expelling hot gases at high speed b) Increasing the pressure in the combustion chamber c) Rotating the compressor blades d) Compressing the air intake Answer: a) Expelling hot gases at high speed The Mach number is the ratio of: a) The speed of an object to the speed of sound in the surrounding medium b) The speed of sound to the speed of light c) The speed of light to the speed of sound d) The speed of an object to the speed of light Answer: a) The speed of an object to the speed of sound in the surrounding medium In level flight, an aircraft is said to be in equilibrium when: a) Lift equals weight and thrust equals drag b) Lift is greater than weight and thrust is greater than drag c) Lift is less than weight and thrust is less than drag d) Lift equals drag and thrust equals weight Answer: a) Lift equals weight and thrust equals drag Induced drag in an aircraft is caused by: a) The creation of lift b) Air friction on the surface of the aircraft c) Turbulent flow over the wings d) The weight of the aircraft Answer: a) The creation of lift The critical Mach number is: a) The Mach number at which the airflow over some part of the wing first reaches the speed of sound b) The Mach number at which the aircraft becomes supersonic c) The Mach number at which the drag force is minimized d) The Mach number at which the lift force is maximized Answer: a) The Mach number at which the airflow over some part of the wing first reaches the speed of sound Advanced Mechanics The pitch of an aircraft is controlled by the: a) Elevators b) Ailerons c) Rudder d) Flaps Answer: a) Elevators A vortex is formed at the wing tips of an aircraft due to: a) The high-pressure air from below the wing flowing around the wing tip to the low-pressure area above the wing b) The high-speed flow of air over the wing c) The turbulent flow of air behind the aircraft d) The interaction of the fuselage with the wing Answer: a) The high-pressure air from below the wing flowing around the wing tip to the low-pressure area above the wing The neutral point of an aircraft is defined as: a) The point along the longitudinal axis where the pitching moment coefficient is independent of the angle of attack b) The center of mass of the aircraft c) The point where the lift force is greatest d) The point where the drag force is minimized Answer: a) The point along the longitudinal axis where the pitching moment coefficient is independent of the angle of attack In a supersonic flight, the shock wave generated by the aircraft is: a) A sudden change in pressure, temperature, and density b) A gradual change in pressure, temperature, and density c) A reflection of sound waves d) A reduction in drag Answer: a) A sudden change in pressure, temperature, and density For a stable aircraft, the center of gravity (CG) must be: a) Forward of the neutral point b) Aft of the neutral point c) Exactly at the neutral point d) Far aft of the center of pressure Answer: a) Forward of the neutral point The flutter phenomenon in aircraft is related to: a) Aeroelastic instability leading to rapid oscillations b) Structural failure due to excessive load c) Reduction in lift due to high angle of attack d) Increase in drag due to high-speed flight Answer: a) Aeroelastic instability leading to rapid oscillations The term “specific impulse” in rocketry refers to: a) Thrust produced per unit mass flow rate of the propellant b) Total impulse delivered by the engine c) Efficiency of the fuel combustion process d) Maximum speed achieved by the rocket Answer: a) Thrust produced per unit mass flow rate of the propellant The thrust-to-weight ratio of an aircraft is an important parameter for: a) Determining its climb performance b) Predicting its stall speed c) Measuring its cruising range d) Estimating its fuel consumption Answer: a) Determining its climb performance In a boundary layer, the velocity gradient is highest: a) Near the surface b) Far from the surface c) At the midpoint between the surface and the free stream d) At the edge of the boundary layer Answer: a) Near the surface The phenomenon of “buffet” in aviation refers to: a) Unsteady aerodynamic forces leading to vibrations in the aircraft b) Loss of control due to engine failure c) Sudden drop in altitude d) Increased drag at low speeds Answer: a) Unsteady aerodynamic forces leading to vibrations in the aircraft Structural Mechanics In a cantilever beam, the maximum stress occurs: a) At the fixed end b) At the free end c) At the midpoint d) Along the neutral axis Answer: a) At the fixed end The Young’s modulus of a material is a measure of its: a) Stiffness b) Strength c) Hardness d) Toughness Answer: a) Stiffness Buckling in columns is most likely to occur when: a) The column is long and slender b) The column is short and thick c) The column is loaded transversely d) The column is subjected to tensile forces Answer: a) The column is long and slender The factor of safety in structural design is used to: a) Account for uncertainties in loading and material properties b) Ensure that the structure is overdesigned c) Reduce the cost of materials d) Minimize the weight of the structure Answer: a) Account for uncertainties in loading and material properties A shear force in a beam results from: a) A transverse load applied to the beam b) An axial load applied to the beam c) A torsional load applied to the beam d) A uniform load applied to the beam Answer: a) A transverse load applied to the beam In a statically indeterminate structure, the number of unknowns is: a) Greater than the number of equilibrium equations b) Equal to the number of equilibrium equations c) Less than the number of equilibrium equations d) Independent of the number of equilibrium equations Answer: a) Greater than the number of equilibrium equations In composite materials, the matrix material is primarily responsible for: a) Binding the fibers together and transferring stress to them b) Carrying the main load c) Reducing the weight of the structure d) Enhancing the thermal properties of the material Answer: a) Binding the fibers together and transferring stress to them The ultimate tensile strength (UTS) of a material is: a) The maximum stress that the material can withstand while being stretched or pulled before necking b) The stress at which the material begins to deform plastically c) The stress at which the material fractures d) The stress at which the material returns to its original shape Answer: a) The maximum stress that the material can withstand while being stretched or pulled before necking Creep in materials refers to: a) Slow and progressive deformation under constant stress b) Sudden fracture under high stress c) Elastic deformation under low stress d) Rapid deformation under cyclic loading Answer: a) Slow and progressive deformation under constant stress In fatigue analysis, the S-N curve represents: a) The relationship between the stress amplitude and the number of cycles to failure b) The relationship between strain and number of cycles to failure c) The relationship between stress amplitude and strain d) The relationship between stress and strain Answer: a) The relationship between the stress amplitude and the number of cycles to failure

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