Vibration Analysis Quiz

The RMS level is...

• Half the peak level

• Twice the peak level

• 0.707 times the peak level (for a pure sine wave)

• Half the peak-to-peak level

Identify the RMS level on this chart (choose between A, B, C, and D as indicated on the graph).

• A

• B

• C

• D

The relationship between frequency and period is:

• They are the same

• Frequency (Hz) = 1/period (seconds)

• Frequency (Hz) = period 2

• Period (minutes) = 1/frequency (CPM) 2

Is the RMS level of this vibration signal equal to 0.707 times the peak level?

• Yes

• No

The measurement that is proportional to the rate of change of velocity is...

• Displacement

• Velocity

• Acceleration

• Jerk

The measurement that is proportional to the fatigue experienced by the shaft and bearing is...

• Jerk

• Displacement

• Velocity

• Acceleration

The measurement unit that is most sensitive to low frequency vibration is...

• Displacement

• Velocity

• Acceleration

• Hertz

When integrating from acceleration to velocity what happens to the phase?

• It shifts by 90 degrees

• It shifts by 180 degrees

• It does not change

• It depends on the location of the phase reference

Phase is measured in units of...

• Seconds

• RPM

• Degrees

• Orders

What is the phase relationship between these two signals?

• In phase

• 180 degrees out of phase

• 90 degrees out of phase

• 270 degrees out of phase