Engineering Mechanics Questions

• The efficiency of a screw jack is maximum, when(where α = Helix angle, and φ = Angle of friction.)
• The above figure shows the three coplaner forces P, Q and R acting at a point O. If these forces are in equilibrium, then
• The range of projectile(R) on an upward inclined plane is
• In a wormed geared pulley block, if the number of teeth on the worm wheel is doubled, then its velocity ratio is also doubled.
• In a framed structure, as shown in the below figure, the force in the member CD is tensile in nature.
• The moment of inertia of a solid cylinder of mass m, radius r and length l about the longitudinal axis or polar axis is
• The acceleration of a particle moving with simple harmonic motion is __________ at themean position.
• The velocity of a particle moving with simple harmonic motion is __________ at the mean position.
• The centre of gravity of a hemisphere lies at a distance of 3r / 8 from its base measured along the vertical radius.
• In order to double the period of simple pendulum, the length of the string should be
• The law of motion involved in the recoil of gun is
• The angle of the inclined plane at which a body just begins to slide down the plane, is called helix angle.
• A circular hole of 50 mm diameter is cut out from a circular disc of 100 mm diameter as shown in the below figure. The centre of gravity of the section will lie
• Mass moment of inertia of a thin rod about its one end is __________ the mass moment of inertia of the same rod about its mid-point
• Frequency of vibrations means the number of cycles per second.
• If a pendulum is taken 1 km below the earth surface in a mine, it will __________ in time.
• The moment of inertia of a square of side a about its base is a4/ 3.
• If tension in the cable supporting a lift moving downwards is half the tension when it is moving upwards, the acceleration of the lift is
• Coplaner concurrent forces are those forces which
• The loss of kinetic energy due to direct impact of two bodies __________ upon the value of coefficient of restitution.