ITMC Preventive Maintenance & Troubleshooting 2

Question 1

A vibration analysis on a rotating shaft shows a dominant frequency at exactly 1x running speed. What is the most likely cause?

Accepted Answer

Mass unbalance

Answer

A dominant vibration at 1x running speed (fundamental frequency) is the classic signature of mass unbalance in a rotating component.

Question 2

Which lubrication method is BEST suited for bearings operating at very high speeds?

Accepted Answer

Oil mist lubrication

Answer

Oil mist lubrication delivers a fine aerosol of oil that minimizes churning losses and heat buildup, making it ideal for high-speed bearings.

Question 3

During a PM inspection, a technician finds a V-belt deflects more than the manufacturer's specification. What corrective action is required?

Accepted Answer

Increase belt tension

Answer

Excessive deflection indicates the belt is too slack and must be tensioned to the manufacturer's specification to prevent slipping and premature wear.

Question 4

A hydraulic system is operating at lower pressure than its setpoint even though the pump is running. The FIRST component to inspect is:

Accepted Answer

The pressure relief valve

Answer

A relief valve stuck open or set too low will bleed off pressure, causing the system to operate below setpoint.

Question 5

What does a trending increase in motor winding insulation resistance readings over several PM intervals indicate?

Accepted Answer

Insulation condition is improving

Answer

Insulation resistance readings that trend upward over time indicate the insulation is drying out and improving in quality.

(ITMC) Industrial Technology Maintenance Certification Practice Test

(ITMC) Industrial Technology Maintenance Certification Practice Test

ITMC Preventive Maintenance & Troubleshooting 2