Engineering Mechanics Questions

• The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of α rad / s2, is
• A framed structure is imperfect, if the number of members are __________ (2j - 3).
• A block ot mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will __________ with the increase in coefficient of friction.
• The rate of doing work is known as
• The centre of gravity of a right circular solid cone is at a distance of __________ from its base, measured along the vertical axis.(where h = Height of a right circular solid cone.)
• If three coplaner forces acting on a point are in equilibrium, then each force is proportional to the sine, of the angle between the other two.
• The unit of work in S.I. units is
• Onejoule is equal to
• One end of a helical spring is fixed while the other end carries the load W which moves with simple harmonic motion. The frequency of motion is given by(where δ = Deflection of the spring.)
• Varingon's theorem of moments states that if a number of coplaner forces acting on a particle are in equilibrium, then
• Moment of inertia of a rectangular section having width (b) and depth (d) about an axis passing through its C.G. and parallel to the depth (d), is
• If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be
• In actual machines, mechanical advantage is __________ velocity ratio.
• The loss of kinetic energy during inelastic impact, is given by(where m1 = Mass of the first body,m2 = Mass of the second body, and u1 and u2 = Velocities of the first and second bodies respectively.)
• The polygon law of forces states that if a number of forces, acting simultaneously on a particle, be represented in magnitude and direction by the sides a polygon taken in order, then their resultant is represented in magnitude and direction by the closing side of the polygon, taken in opposite direction.
• The periodic time (T) is given by(where ω = Angular velocity of particle in rad / s.)
• The centre of oscillation and centre of suspension for a compound pendulum are interchangeable.
• The terms 'leverage' and 'mechanical advantage' Of a compound lever have got the same meaning.
• For a self locking machine, the efficiency must be
• A rubber ball is dropped from a height of 2 m. If there is no loss of velocity after rebounding, the ball will rise to a height of