Millwright-Preventive and Predictive Maintenance Exam Questions With Verified Answers

Millwright-Preventive and Predictive Maintenance Exam Questions With Verified Answers Preventive maintenance - answeris the periodic inspection and maintenance of plant assets and equipment to uncover conditions that may to equipment failure or shortened life This measures the amount of contaminants per litre of fluid. a. ferromagnetic analysis b. total base number c. infrared tests d. gravimetric level analysis - answerd. gravimetric level analysis These tests indicate how much of the oil additives have been depleted a. ferromagnetic analysis b. total base number c. spectographic level analysis d. gravimetric level analysis - answerb. total base number This technique is advanced and becomming more common in industry. It determines concentrations of contaminants over a period and accurately predicts the lubricant failure. a. ferromagnetic analysis b. total base number c. spectographic level analysis d. gravimetric level analysis - answerc. spectographic level analysis These tests reveal the amount of general oil degradation. a. ferromagnetic analysis b. infrared c. spectographic level analysis d. gravimetric level analysis - answerb. infrared What is a method of determining the condition of lubrication or hydraulic oil? - answerParticle Analysis Automatic particle counters APCs or laser particle sizing APS can determine particle size and distribution What is one of the most expensive and dangerous methods of NDT? - answerUsing X-Rays Harmful gamma and xrays What two kinds of Ultra-Sonic inspection are used in Millwright trade? - answerImmersion and Contact Scale, paint and corrosion removal may be required before inpsection Static unbalance is sometimes called (this is when the weighted centerline and shaft axis are parallel but misaligned (shifted) along their length a. force or kinematic unbalance b. couple unbalance c. misalignment d. shaft offset - answera. force or kinematic unbalance This is caused when shafts weight is evenly distributed along its length but unevenly distributed side to side This type of unbalance has extra equal weights on opposite sides of the shaft. (6 oclock and 12 oclock) This causes the weighted centerline of the rotating part to intersect the shaft axis. a. force or kinematic unbalance b. couple unbalance c. quasi static d. shaft offset - answerb. couple unbalance detailed analysis - answerAll good PM programs begin with a ________ of past equipment failures, including their costs, causes, remedial actions taken, and changing demands on the equipment. critical, important, and nonthreatening - answerThree catagories of equipment failures: Nondestructive testing - answerNDT Nondestructive evaluation - answerNDE How is couple unbalance detected? a. when shaft is rotated and 180* phase angle is indicated between ends of arbor b. when shaft is rotated and 180* phase angle is indicated between ends of rotor c. when shaft is rotated and 270* phase angle is indicated between ends of rotor d. when shaft is rotated and 270* phase angle is indicated between ends of arbor - answerb. when shaft is rotated and 180* phase angle is indicated between ends of rotor PDM program - answerNDE is the main tool in the _______. In this condition the extra weights at either end are unequal and are at opposite ends of the shaft a. force or kinematic unbalance b. couple unbalance c. quasi static d. dynamic unbalance - answerc. quasi static The weighted centerline of the rotor and shaft axis do not intersect in the centerline of the shaft This type of vibration or unbalance would be cause if weight is unevenly distributed along the length of the shaft, across the width or at different angles about the radius a. force or kinematic unbalance b. couple unbalance c. quasi static d. dynamic unbalance - answerd. dynamic unbalance the most common type of unbalance, forces are complex and usually involve a computer for correction