Test: Engineering Mechanics - 4 - Mechanical Engineering MCQ

A lift moves downwards with an acceleration of 9.8 m/s². The pressure exerted by a man on the floor of the lift is zero.

Non-coplaner concurrent forces are those forces which

Which of the following statement is correct?

The maximum efficiency of a screw jack is

In a framed structure, as shown in the below figure, the force in the member AC is numerically equal to the force in member BC.

Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

The force which acts along the radius of a circle and directed towards the centre of the circle is known as centripetal force.

Concurrent forces are those forces whose lines of action

Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.

If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by

According to the law of moments, if a number of coplaner forces acting on a particle are in equilibrium, then

Two bodies of masses m₁,and m₂ are hung from the ends of a rope, passing oyer a frictionless pulley as shown in the figure below. The acceleration of the string will be

The centre of gravity of a trapezium with parallel sides a and b lies at a distance of y from the base b, as shown in the below figure. The value of y is

The total momentum of a system of masses (i. e. moving bodies) in any one direction remains constant, unless acted upon by an external force in that direction. This statement is called

A machine having an efficiency less than 50%, is known as

The velocity ratio of a differential pulley block with D and d as the diameters of larger and smaller pulley, is

The unit of mass moment of inertia in S.I. units is kg-m².