Corrective Maintenance Flashcards
7 cards from real CMRT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Corrective Maintenance flashcards as text
A clamp-style ammeter is the preferred diagnostic tool during electrical troubleshooting because it:
Answer: Measures current flow without breaking or interrupting the circuit
A clamp meter senses the magnetic field around a conductor to measure current, eliminating the need to open the circuit and interrupt equipment operation.
Vibration analysis on a rotating machine can detect all of the following EXCEPT:
Answer: Lubrication oil viscosity
Vibration analysis detects mechanical faults such as imbalance, misalignment, and bearing defects, but oil viscosity requires oil analysis—not vibration measurement.
Infrared thermography is MOST effective during corrective maintenance for identifying:
Answer: Thermal hot spots caused by loose connections or excessive friction
IR cameras detect surface temperature anomalies; loose electrical connections and friction-generating mechanical defects produce characteristic hot spots visible in a thermal image.
The split-half troubleshooting method involves:
Answer: Testing the midpoint of a system to halve the number of suspect components with each test
Split-half testing applies a binary search logic: test at the midpoint, determine which half contains the fault, then repeat on that half—dramatically reducing diagnostic time.
A centrifugal pump showing reduced flow output should FIRST be evaluated by:
Answer: Gathering operating data and comparing actual performance against the pump curve
Comparing actual head, flow, and power draw to the design pump curve identifies where the machine is operating and points toward the most likely cause of degradation.
A motor drawing significantly higher current than its nameplate rating MOST likely indicates:
Answer: Mechanical overload, bearing failure, or an electrical fault in the windings
Excess current draw signals the motor is working harder than designed, commonly caused by mechanical drag from bearing failure, driven-equipment overload, or winding faults.
A megohmmeter (megger) is used during corrective maintenance primarily to test:
Answer: Insulation resistance in electrical windings and cables
A megohmmeter applies high DC voltage to measure insulation resistance, detecting moisture intrusion, contamination, or insulation breakdown in motors and cables.