Related Questions

In under damped vibrating system, the amplitude of vibration
A Decreases linearly with time
B Increases linearly with time
C Decreases exponentially with time
D Increases exponentially with time
In a second order under damped system, the
A Time required for the response of first reach its ultimate value is called the response time
B Overshoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient e
C Decay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot
D None of these
If the gain of the critical damped system is increased it will behave as
A Oscillatory
B Critically damped
C Overdamped
D Underdamped
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
When a mass of a critically damped single degree of freedom system is deflected from its equilibrium position and released, then it will
A Return to equilibrium position without oscillation
B Oscillate with increasing time period
C Oscillate with decreasing amplitude
D Oscillate with constant amplitude
If the transient response is under damped:
A steady-state will be reached faster than if the system is overdamped
B the value of the output will exceed the value of the input at times during the transient period
C the present overshoot is zero
D both a and b
E None of the above
The oscillations in a synchronous motor can be damped out by
A maintaining constant excitation
B running the motor on leading power factors
C providing damper bars in the rotor pole faces
D oscillations cannot be damped
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
What is the dynamic error in a critically damped second order instrument for a ramp input (AT)?
A 0.5 AT
B 2 AT
C $$\sqrt {{\text{AT}}} $$
D 1.5 AT
A typical example of an exothermic reversible reaction conducted at high pressure in industry is
A Dehydration of ethanol
B Methanol synthesis
C Reformation of methane
D Polymerisation of ethylene

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