Related Questions

Vibrating screens are used for handling large tonnages of materials. The vibrating motion is imparted to the screening surface by means of
A Electromagnets
B Cams or eccentric shafts
C Unblanced fly wheels
D Either A, B or C
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°
In vibration isolation system, the transmissibility will be equal to unity, for all values of damping factor, if $$\frac{\omega }{{\omega {\text{n}}}}$$ is
A Equal to 1
B Equal to 2
C Less than 2
D Greater than 2
The transmissibility, for all values of damping factor, will be less than unity, if $$\frac{\omega }{{\omega {\text{n}}}}$$ is
A Equal to 1
B Less than 2
C Equal to 2
D Greater than 2
When the damping co-efficient (ξ) is unity, the system is
A Overdamped
B Critically damped
C Underdamped
D Highly fluctuating
A simple spring-mass vibrating system has a natural frequency of $${{\text{f}}_{\text{n}}}.$$ If the spring stiffness is halved and the mass is doubled, then the natural frequency will become
A $$\frac{{{{\text{f}}_{\text{n}}}}}{2}$$
B $$2{{\text{f}}_{\text{n}}}$$
C $$4{{\text{f}}_{\text{n}}}$$
D $$8{{\text{f}}_{\text{n}}}$$
A single phase transformer has a maximum efficiency of 90% at full load and unity power factor. Efficiency at half load at the same power factor is -
A 87.8%
B 86.7%
C 88.26%
D 88.9%
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 vibrating reed frequency meter the natural frequencies of two adjacent reeds have a difference of
A 0.1 Hz
B 0.25 Hz
C 0.5 Hz
D 1.5 Hz

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