Preventive Maintenance & Troubleshooting Flashcards
7 cards from real ITMC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Preventive Maintenance & Troubleshooting flashcards as text
A pneumatic cylinder is slow to extend but retracts at normal speed. The MOST likely cause is:
Answer: A restriction in the extend-side flow path or a leaking piston seal
Slow extension with normal retraction points to a restriction or internal piston seal leak on the extend side, reducing effective force and speed in one direction.
When using a dial indicator to check shaft runout on a lathe, the total indicator reading (TIR) represents:
Answer: The total range from minimum to maximum reading over one full rotation
TIR (Total Indicator Reading) is the full range between the highest and lowest dial indicator values recorded during one complete shaft rotation.
A conveyor belt is tracking to one side consistently. What is the MOST common PM adjustment to correct this?
Answer: Adjust the tail pulley to steer the belt back to center
Adjusting the tail (or training) pulley tilts it slightly, which steers the belt back toward the center of the conveyor.
What is the significance of the P-F curve in predictive maintenance?
Answer: It represents the time between a detectable potential failure and functional failure
The P-F curve shows the interval between when a potential failure can first be detected (point P) and when functional failure occurs (point F), defining the window for predictive intervention.
A technician is torquing bolts on a critical flange connection. The CORRECT procedure is to:
Answer: Tighten bolts in a star (cross) pattern in multiple passes to the final torque
A cross (star) pattern in multiple incremental passes ensures even load distribution across the flange and prevents warping or uneven gasket compression.
Which electrical test is used to detect insulation breakdown between motor windings and the motor frame (ground)?
Answer: Megohmmeter (megger) test
A megohmmeter applies high DC voltage to measure insulation resistance between windings and ground, identifying insulation degradation or breakdown.
During troubleshooting, a technician uses the 'half-split' method. This technique means:
Answer: Dividing the system in half to isolate the fault location, then repeating
The half-split (binary search) method divides the system at its midpoint to determine which half contains the fault, then repeats until the fault is isolated.