MAE 1351 EXAM 2 LATEST 2022 QUESTIONS AND ANSWERS

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MAE 1351 EXAM 2 LATEST 2022 QUESTIONS AND ANSWERS An assembly cannot be nested inside another assembly; only parts can. -Answer- False I bring a part into assembly in SW, and click the OK check ... Mark in the top right. This will... -Answer- Align the component origin with assembly origin I bring a cube into assembly and mats coincident it's edge to a fixed edge, how DOFS are left ? -Answer- 2 I bring a cube into assembly mate coincident one of its vertices to a fixed vertex, how many DOFs are left? -Answer- 3 For every mate I apply, I reduce the DOF of the part by... -Answer- Depends on the mate I bring a cylinder into an assembly and mate parallel one if it's flat faces to the top plane, this loses how many DOFs -Answer- 2 I bring a cylinder into an assembly and mate tangent it's curved surface to a curved surface of a fixed cylinder, longitudinally these cylinders are parallel, how many DOFS? -Answer- 3 The equivalent of mass in a rotational system is called the -Answer- Moment of intertia I have an assembly with moving parts and wish to check that I have part clearances throughout, for this I need -Answer- Motion study In a SW assembly it is possible to assign an arbitrary motion to a component to visualize its overall behavior, true? -Answer- Yes, very easily In FEA (finite element analysis) certain physical values are specified at the edge and nodal points as -Answer- Boundary conditions Screw thread -Answer- helix or conical spiral formed on the conical spiral formed on the external surface of a shaft or the internal surface of a cylindrical hole Axis -Answer- A longitudinal centerline of the thread Root -Answer- The bottom of the cut on external threads Crest -Answer- Top of the external threads Major diameter -Answer- Largest diameter of a screw thread. The distance is measured from crest to crest through an axis on an external thread. Minor diameter -Answer- Smallest diameter of a screw thread. The dimension is measured from root to root through the axis on an external thread. Pitch diameter -Answer- Imaginary diameter measured from a point halfway between the major and minor diameters through the axis to a corresponding point on a corresponding point on the opposite side. Pitch -Answer- Distance from a point on a screw thread to a corresponding point on the next thread as measured parallel to the axis. Depth of thread -Answer- Distance between the crest and the root of a thread as measured perpendicular to the axis. Angle of thread -Answer- The included angle between the sides of the thread Body -Answer- That portion of a screw shaft that is left unthreaded. Chamfer -Answer- An angular relief at the last thread engage more with a mating part; commonly applied to the first thread to help start a thread in its mating part. Classes of threads -Answer- A designation of the amount of tolerance and allowance specified for a thread Fit -Answer- Identifies a range of thread tightness or looseness Thread series -Answer- Groups of common major diameter and pitch characteristics determined by the number of threads per inch Lead -Answer- Distance of a screw thread advances axially in one full turn American National Thread -Answer- 60 degree V-Thread (Standard) used in USA, Canada and UK Square thread -Answer- Best thread for transmitting power. Difficult to manufacture-replaced by ACME thread(ex. screw jacks, vice screw) Buttress thread -Answer- Designed for applications with high stress in one direction (ex. breech assemblies of large guns, airplane propeller hubs, columns for hydraulic presses) Rolled thread (knuckle) -Answer- usually rolled from sheet metal (ex. light bulbs, light sockets, bottle tops) Tap cuts -Answer- internal threads [Show More]

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