Millwright level 1 Exam Questions With Verified Answers
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Course
Millwright
Institution
Millwright
Millwright level 1 Exam Questions
With Verified Answers
What does( 3/4''-10 unc -2a x 1 1/2'' )stand for? - answer3/4''= 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 ...
Millwright level 1 Exam Questions With Verified Answers What does( 3/4'' -10 unc -2a x 1 1/2'' )stand for? - answer✔✔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 - answer✔✔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 t hreads, 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? - answer✔✔M= Metric 8= nominal diameter in mm 1.25= the pitch 50mm= length of fastener machine screws - answer✔✔special group of screws 3/8'' or less in diameter to find the diameter of a machine screw - answer✔✔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 - answer✔✔is installed into a drilled hole slightly smaller than the major diameter of the screw find the tap needed for a drill - answer✔✔TDS= Nominal dia - pitch lubrication does what? - answer✔✔reduces friction and increases life by reducing wear sliding friction - answer✔✔contact spread over a large surface, pressure per sq in usually light rolling friction - answer✔✔rolls over a surface, area of contact is quite small pressure load is high fluid friction - answer✔✔two surfaces in contact, a film of oil is formed ,filling up the depressions and covering the projections on both surfaces. adheasion - answer✔✔forces cause unlike material to stick together cohesion - answer✔✔cause molecules of like material to stick together viscosity - answer✔✔the res istance to flow choosing viscosity - answer✔✔depends on speed, load, temp, pressure, and environment how is viscosity measured? - answer✔✔dynamic and kinematic kinematic viscosity - answer✔✔affected by the density of the oil measured in centistokes calcium soap grease - answer✔✔requires a small amount of water to stabilize. recommended for damp conditions with low heat sodium soap grease - answer✔✔soluble in water but has high temperature range. only used in dry and high temp conditions aluminum soap grease - answer✔✔gives stringiness and is used where adhesiveness is important. water resistant not recommend for high temps. lithium and barium soap grease - answer✔✔water resistant and high temperatures the most commonly used soap grease. dropping point - answ er✔✔the temperature that a grease will become fluid enough to drip. what is the most commonly used lifting rope? and why - answer✔✔the wire rope it is stronger than natural and synthetic ropes and gives good warning of failure when defective. construction of wire rope - answer✔✔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 - answer✔✔crush resistant
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