Dynamics of Machine Quiz 02.07.20

On which factors does law of friction depend?

• Nature of material

• Area of contact between surfaces

• Velocity of sliding

• All of the above

The loading generally act upon the ___________ of the body.

• Centroid

• Symmetrical centre

• Rotational centre

• Chiral centre

Which of the following is incorrect regarding inertia force?

• Imaginary force

• Acts upon a rigid body

• Brings the body to equilibrium

• Same direction as of accelerating force

D-Alembert’s principle is used for which of the following?

• Change static problem into a dynamic problem

• Change dynamic problem to static problem

• To calculate moment of inertia of rigid bodies

• To calculate angular momentum of a system of masses

In the expression F – m.a = 0, the term – m.a is called

• Reversed effective force

• Net force

• Coriolis force

• Resultant force

Why the inertia torque acts in the opposite direction to the accelerating couple?

• Bring the body in equilibrium

• To reduce the accelerating torque

• Acts as a constraint torque

• Increase the linear acceleration

A body remains in equilibrium if ________

• Inertia force is applied in the same direction to the resultant force

• Inertia force is applied in the direction opposite to the resultant force

• Inertia force is applied in the direction Perpendicular to the resultant force

• Inertia force is applied in the direction Parallel to the resultant force

Considering a four bar chain with each link having linear and angular acceleration, applying D-Alembert’s principle will never result in which of the following member?

• 2- force member

• 3- force member

• 4 – force member

• Non accelerating member

If the normal force creates a tension then the force is said to be ____________

• Positive

• Negative

• Rotational

• Collinear

Which of the following conditions should be satisfied for static balancing?

1. Dynamic forces acting on the system should be zero

2. Couple acting on the system due to dynamic force should be zero

3. Centrifugal forces acting on the system should be zero

4. Couple acting on the system due to centrifugal forces should be zero

• Condition 1 and condition 2

• Condition 1 and condition 3

• Condition 3 and condition 4

• All of the above