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Vibrations Questions Set 7:

Quiz Mode

If the isolation factor is negative, what is the phase difference between the transmitted and disturbing force?

180°

90°

450°

360°

Solution:

Which of the following is a type of force transmitted to the foundation?

Damping force

Undamping force

Tensile force

Torsional force

Solution:

For a body subjected to transverse vibrations, the type of stress induced will be

compressive stress

shear stress

hydrostatic stress

bending stress

Solution:

Which of the following statements about the isolation factor is correct?

It is a dimensionless quantity

Its unit is Newton

Its unit is Joule

Its unit is Hz

Solution:

If the periodic time is 1.917 seconds and the total time taken for the oscillations is 19.17 seconds, find the number of oscillations.

36.74

21.087

17.253

Solution:

When the angular frequency of the applied force varies, the amplitude changes and becomes maximum. Name the phenomenon.

Damping

Resonance

Forced vibrations

Oscillations

Solution:

For a case of base excitation of simple spring mass damper system, the frequency ratio at which the amplitude of excitation is equal to amplitude of vibration (other than trivial case of 0), irrespective of the damping factor of the system, is:

1.414

1.6

1.732

Solution:

A unit with a mass of 40 kg is supported on 3 springs with the same stiffness. The unit operates at 500 rpm. Find the stiffness of each spring if only 10% of the shaking force is allowed to be transmitted to the support structure.

3.459 N/mm

7.89 N/mm

5.472 N/mm

3.324 N/mm

Solution:

What is critical damping?

Largest amount of damping for which no oscillation occurs in free vibration

Smallest amount of damping for which no oscillation occurs in free vibration

Largest amount of damping for which the motion is simple harmonic in free vibration

Smallest amount of damping for which the motion is simple harmonic in free vibration

Solution:

In forced vibration, resonance is a phenomenon that can occur frequently if not taken care of. The value of the viscous damping ratio (ζ) is used to predict the dynamic system's resonance characteristics.

Consider the following data:

c = Damping constant of the system = 1000 Ns/m

m = Mass of the system = 100 kg

What is the maximum permissible value of the system's stiffness constant (k) to prevent resonance of the system?

5000 N/m

4000 N/m

3000 N/m

2000 N/m

Vibrations Questions Set 7:

If the isolation factor is negative, what is the phase difference between the transmitted and disturbing force?

Solution:

Which of the following is a type of force transmitted to the foundation?

Solution:

For a body subjected to transverse vibrations, the type of stress induced will be

Solution:

Which of the following statements about the isolation factor is correct?

Solution:

If the periodic time is 1.917 seconds and the total time taken for the oscillations is 19.17 seconds, find the number of oscillations.

Solution:

When the angular frequency of the applied force varies, the amplitude changes and becomes maximum. Name the phenomenon.

Solution:

For a case of base excitation of simple spring mass damper system, the frequency ratio at which the amplitude of excitation is equal to amplitude of vibration (other than trivial case of 0), irrespective of the damping factor of the system, is:

Solution:

A unit with a mass of 40 kg is supported on 3 springs with the same stiffness. The unit operates at 500 rpm. Find the stiffness of each spring if only 10% of the shaking force is allowed to be transmitted to the support structure.

Solution:

What is critical damping?

Solution:

Solution:

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