Engineering Mechanics Questions

• The time of flight (t) of a projectile on a horizontal plane is given by
• Two equal and opposite parallel forces whose lines of action are different form a couple.
• When a particle moves along a circular path, its acceleration has two components, one is normal component and the other is tangential component of acceleration.
• The moment of inertia of a sphere of mass m and radius r, about an axis tangential to it, is
• The velocity ratio for the third system of pulleys is
• The velocity ratio for the first system of pulleys is(where n is the number of pulleys.)
• Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to
• A machine which is capable of doing work in the reversed direction, after the effort is removed, is called a non-reversible machine.
• A body of mass m moving with a constant velocity v strikes another body of same mass m moving with same velocity but in opposite direction. The common velocity of both the bodies after collision is
• Vectors method for the resultant force is also called polygon law of forces.
• If the number of pulleys in a system is equal to its velocity ratio, then it is a __________ system of pulleys
• Moment of inertia of a hollow rectangular section as shown in the below figure about Y-Y axis, is not the same as that about X-X axis.
• The centre of gravity of a triangle lies at a point where its medians intersect each other.
• One joule means that
• When a train is rounding a curve, the side thrust on the wheel flanges is prevented by raising the outer edge of the rail.
• The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (α) is
• The force, by which the body is attracted, towards the centre of the earth, is called
• The velocity ratio for the second system of pulleys is n.
• Efficiency of a screw jack is given by(where α = Helix angle, and φ = Angle of friction.)
• The velocity ratio of a first system of pulleys with 4 pulleys is