Millwright level 1 Exam Questions and Answers Latest Update 2025 Graded A+

Millwright level 1 Exam Questions and Answers Latest Update 2025 Graded A+ What does( 3/4''-10 unc -2a x 1 1/2'' )stand for? - Answers 3/4''= Nominal diameter 10 = Threads per inch UNC = thread style (Unified national Course) 2= Class of fit A= External thread (b= internal thread) 1 1/2''= length (depth of full threads in hole) class of fit 1,2,3,4,5&6 - Answers class 1 fit= maximum looseness in mating threads class 2 fit= average fit little play in mating threads class 3 fit= no looseness in mating threads. class 4 fit= precision threads, usually cut and ground class 5 and 6 fit= embellishments of class 4, but the most precise and accurate threads. what does M8x1.25x50mm stand for? - Answers M= Metric 8= nominal diameter in mm 1.25= the pitch 50mm= length of fastener machine screws - Answers special group of screws 3/8'' or less in diameter to find the diameter of a machine screw - Answers multiply the screw number by 0.013 add 0.060 Ex: #6 machine screw 6 x 0.013 = 0.078 0.078 + 0.060 = 0.138'' self tapping machine screw - Answers is installed into a drilled hole slightly smaller than the major diameter of the screw find the tap needed for a drill - Answers TDS= Nominal dia - pitch lubrication does what? - Answers reduces friction and increases life by reducing wear sliding friction - Answers contact spread over a large surface, pressure per sq in usually light rolling friction - Answers rolls over a surface, area of contact is quite small pressure load is high fluid friction - Answers two surfaces in contact, a film of oil is formed ,filling up the depressions and covering the projections on both surfaces. adheasion - Answers forces cause unlike material to stick together cohesion - Answers cause molecules of like material to stick together viscosity - Answers the resistance to flow choosing viscosity - Answers depends on speed, load, temp, pressure, and environment how is viscosity measured? - Answers dynamic and kinematic kinematic viscosity - Answers affected by the density of the oil measured in centistokes calcium soap grease - Answers requires a small amount of water to stabilize. recommended for damp conditions with low heat sodium soap grease - Answers soluble in water but has high temperature range. only used in dry and high temp conditions aluminum soap grease - Answers gives stringiness and is used where adhesiveness is important. water resistant not recommend for high temps. lithium and barium soap grease - Answers water resistant and high temperatures the most commonly used soap grease. dropping point - Answers the temperature that a grease will become fluid enough to drip. what is the most commonly used lifting rope? and why - Answers the wire rope it is stronger than natural and synthetic ropes and gives good warning of failure when defective. construction of wire rope - Answers small diameter wires wound around a small core to create a strand, strands wound around a steel or fiber core. wire ropes with steel core are - Answers crush resistant abrasion resistant flexibility strength whats the lay of the ropes used? - Answers Right lay and most common left lay are used in special applications fiber cores - Answers made from sisal, polypropylene or other synthetic material independant wire rope core - Answers used when wire ropes are subject to sudden heavy loads crushing or heat.