CMRT Predictive Maintenance Technologies 2

Question 1

In vibration analysis, what does a high amplitude peak at exactly 1× running speed (1X) typically indicate?

Accepted Answer

Unbalance

Answer

Bearing defect

Answer

Gear mesh frequency

Answer

Looseness

Question 2

Which FFT window function is best suited for detecting closely spaced frequency components with similar amplitudes?

Accepted Answer

Hanning

Answer

Flat Top

Answer

Rectangular

Answer

Exponential

Question 3

A vibration spectrum shows peaks at 0.5X, 1X, and 1.5X running speed. This pattern is most consistent with:

Accepted Answer

Fluid-film bearing instability (oil whirl)

Answer

Unbalance

Answer

Misalignment

Answer

Looseness

Question 4

When using an accelerometer for high-frequency vibration measurement, what mounting method provides the widest usable frequency range?

Accepted Answer

Stud mount

Answer

Magnet mount

Answer

Adhesive stud mount

Answer

Hand-held probe

Question 5

The kurtosis value of a vibration signal is most useful for:

Accepted Answer

Detecting early-stage bearing defects

Answer

Identifying resonance frequencies

Answer

Measuring overall vibration severity

Answer

Diagnosing misalignment

Question 6

In rolling element bearing analysis, the Ball Pass Frequency Outer race (BPFO) is calculated using:

Accepted Answer

Number of balls, ball diameter, pitch diameter, and shaft speed

Answer

Shaft speed and number of blades

Answer

Gear tooth count and shaft speed

Answer

Rolling element diameter and shaft speed only

Question 7

When performing route-based vibration data collection, measurements should ideally be taken:

Accepted Answer

Under consistent load and speed conditions

Answer

At random intervals throughout the shift

Answer

Only during equipment startup

Answer

While the equipment is being lubricated