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WorksheetsVibration Phenomena Quiz
Total questions: 10
Worksheet time: 5mins
A technician observes that a suspension bridge vibrates violently only when the wind blows at a steady speed of 40 mph. The wind itself is not oscillating. How is this vibration phenomenon classified?
It is a self-excited vibration driven by the wind.
It is a free vibration from an initial disturbance.
It is a damped vibration responding to gravity.
It is a forced vibration caused by periodic gusts.
What characterizes 'free vibration' in a mechanical system?
Oscillation sustained by a constant external force.
Oscillation driven by a rotating imbalance mass.
Oscillation that increases in amplitude over time.
Oscillation at the system's natural frequency.
What characterizes 'forced vibration' in a mechanical system?
Motion caused by a periodic external force.
Motion that draws energy from a steady source.
Motion caused by an initial impact only.
Motion that occurs only at natural resonance.
Which type of vibration involves the dissipation of energy, usually as heat?
Latent vibration
Random vibration
Damped vibration
Forced vibration
What is 'self-excited vibration' primarily caused by?
A high amount of system damping.
A sudden, single impact load.
A steady, non-vibratory input.
A fluctuating external force.
What is the phenomenon called when the forcing frequency matches the system's natural frequency?
Harmonic Distortion
Mechanical Resonance
Structural Damping
Frequency Modulation
How does increasing the mass of a system generally affect its natural frequency?
It causes the natural frequency to decrease.
It causes the natural frequency to vanish.
It causes no change to the frequency.
It causes the natural frequency to increase.
A rotating fan with a heavy spot on one blade is a classic example of what?
Forced vibration.
Damped free vibration.
Transient vibration.
Self-excited vibration.
Why is the mounting method of a vibration sensor critical for accurate data?
It affects the frequency response range of the sensor.
It alters the fundamental calibration of the crystal.
It determines the digital resolution of the collector.
It changes the electrical voltage supply to the sensor.
What is defined as the number of complete vibration cycles that occur in one second?
The rate of frequency
The mode of resonance
The phase of vibration
The period of vibration
