Related Questions

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
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
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
In a system subjected to damped forced vibrations, the ratio of maximum displacement to the static deflection is known as
A Critical damping ratio
B Damping factor
C Logarithmic decrement
D Magnification factor
Forced circulation evaporators are useful for the concentration of viscous, salting and scale forming liquors. Which of the following is a forced circulation evaporator?
A Long vertical evaporator
B Horizontal tube evaporator
C Agitated film evaporator
D Calenderia vertical tube evaporator
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
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
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 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°

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