Longitudinal vibrations are said to occur when the particles of a body moves

A perpendicular to its axis
B parallel to its axis
C in a circle about its axis
D none of the mentioned

Correct Answer: parallel to its axis

When the particles of the shaft or disc moves parallel to the axis of the shaft, then the vibrations are known as longitudinal vibrations. When the particles of the shaft or disc move approximately perpendicular to the axis of the shaft, then the vibrations are known as transverse vibrations.
Bissoy MCQ
#Machine Dynamics #Vibratory Motion

Related Questions

Torsional vibrations are said to occur when the particles of a body moves
A Perpendicular to its axis
B Parallel to its axis
C In a circle about its axis
D None of these
The natural frequency of free longitudinal vibrations is equal to (where m = Mass of the body, s = Stiffness of the body and $$\delta $$ = Static deflection of the body)
A $$\frac{1}{{2\pi }} \times \sqrt {\frac{{\text{s}}}{{\text{m}}}} $$
B $$\frac{1}{{2\pi }} \times \sqrt {\frac{{\text{g}}}{\delta }} $$
C $$\frac{{0.4985}}{{\sqrt \delta }}$$
D Any one of these
When the particles of a body moves perpendicular to its axis, then the body is said to have
A Longitudinal vibration
B Transverse vibration
C Torsional vibration
D None of these
The frequency of damped vibrations with viscous damping is ________ the frequency of undamped vibrations.
A More than
B Less than
C Same as
D None of these
In steady state forced vibrations, the amplitude of vibrations at resonance is __________ damping coefficient.
A Equal to
B Directly proportional to
C Inversely proportional to
D Independent of
When a body is subjected to transverse vibrations, the stress induced in a body will be
A shear stress
B tensile stress
C compressive stress
D none of the mentioned
A body is said to be under forced vibrations, when
A There is a reduction in amplitude after every cycle of vibration
B No external force acts on a body, after giving it an initial displacement
C A body vibrates under the influence of external force
D None of the above
The change in length due to a tensile or compressive force acting on a body is given by (where P = Tensile or compressive force acting on the body, $$l$$ = Original length of the body, A = Cross-sectional area of the body and E = Young's modulus for the material of the body)
A $$\frac{{{\text{P}}l{\text{A}}}}{{\text{E}}}$$
B $$\frac{{{\text{P}}l}}{{{\text{AE}}}}$$
C $$\frac{{\text{E}}}{{{\text{P}}l{\text{A}}}}$$
D $$\frac{{{\text{AE}}}}{{{\text{P}}l}}$$
If $$\frac{\omega }{{\omega {\text{n}}}}$$ is very high for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
A 0°
B 90°
C 180°
D 360°
If $$\frac{\omega }{{\omega {\text{n}}}}$$ is very low for a body vibrating under steady state vibrations, the phase angle for all values of damping factors, will tend to approach
A 0°
B 90°
C 180°
D 360°

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