DOM IAT-II

The speed at which the shaft runs so that the additional deflection from the axis of rotation of the shaft becomes infinite, is known as _________

• a) Whirling speed

• b) Rotational speed

• c) Stabilizing speed

• d) Reciprocating speed

A shaft supported in ball bearings is assumed to be a simply supported.

• a) True

• b) False

Fluid resistance causes damping which is known as ______

• a) Resistance damping

• b) Fluid damping

• c) Viscous damping

• d) Liquid damping

In damped vibrations, the amplitude of the resulting vibration gradually reduces. This is due to the reason that an amount of energy is always dissipated to overcome the ________

• a) Frictional resistance

• b) Work done

• c) Fluid pressure

• d) Air pressure

The resistance to the motion of the body is provided by ______

• a) Medium of vibration

• b) Speed of vibration

• c) Length of the material

• d) External friction

In which direction does the damping force acts?

• a) Opposite to the motion

• b) Along the motion

• c) Perpendicular to motion

• d) Variable

In which direction does the accelerating force acts?

• a) Opposite to the motion

• b) Along the motion

• c) Perpendicular to motion

• d) Variable

In which of the following cases, overdamping occurs?

• a) Roots are real

• b) Roots are complex conjugate

• c) Roots are equal

• d) Independent of the equation

In which of the following cases, underdamping occurs?

• a) Roots are real

• b) Roots are complex conjugate

• c) Roots are equal

• d) Independent of the equation

In a system with different shaft parameters, the longest shaft is taken for calculations.

• a) True

• b) False