NX Interview Questions

Unigraphics (UG) NX Interview Questions and Answers 1) What do you mean by Gateway Application in UG?

Unigraphics functions are divided into applications of common capabilities, such as Modeling , NX Sheet Metal, Shape Studio, Drafting, Manufacturing, Assemblies etc. When you open Unigraphics, you are in the Gateway application because this application is a prerequisite to all other application. 2) What is Master Model Concept? The same model is used from conceptual design to the Drafting, Assembly, Analysis and Manufacturing. The idea of a virtual assembly taken to its logical conclusion leads to Master Model paradigm. If you change any thing in Master Model, it will reflect in all other applications. 3) What do you mean by Team Center? It is a PDM (Product Data Management) software which helps the organisation effectively control the design, development, analysis, manufacturing through out the product of life cycle. 4) How to convert a file created in mm to inches (conversion of units) in UG? We can convert a file created in mm to inches by using UG command prompt. ug_convert_part (space) -in (space) 1234.prt Note: Save your file where command prompt showing location; Example:- C:/users/username 5) What is meant by UDF? User defined feature is used to create the objects of different sizes in a single file. We can create our own form features that automate commonly used design elements. You can create and add the user defined features (UDFs) to target solids. You can define the shape and function of features, and create hierarchical libraries of features that are tailored to our need. 6) What is Promote body? When you have an assembly that is work part, this option lets you promote a body from a loaded assembly component to the level of the assembly. The promote body remains associative to the original body, which is referred to as the base body. Once you have promote a body, you can perform operations on it, such as adding features, performing Boolean operations between it and other bodies, and so on. The effects of these operations are only visible at the level of the assembly work part in which the promote was created, and in any other assembly that references that part. 7) What is Wave Link Geometry? This option create an associate copy of composite curve, sketch, datum, point, face, body, mirror body of part file in assembly file. Once you have a wave linked boy you can perform operations on

it. (Example: In Machining model you can add wave link of Casting model and perform the machining operations) 8) What is Extract Body? This option create an associate copy of an entire body in part file. Features can then be added to Extract Body feature without appearing on the original body. You can also decide whether you want he Extract Body feature to update when the original body is changed. 9) What are Part families? This option let you create a family of parts by creating a template part. You can use the Unigraphics spread sheet (via the Create button on the Part Families dialog) to create a table describing the various part family members. 10) What do you mean by Expressions? Expressions are mathematical or conditional equations used to control the parameters of a model. With expressions, you can easily apply major edits to a model. By changing the expressions that control a specific parameter, you can re-size or re-position features of a solid model Three types of Expressions are there 1. Airthmatic Expressions 2. Conditional Expressions 3. Geometric Expressions

11) What is Direct Modeling or Synchronous Modeling? Direct modeling techniques represents extended capabilities for some of the more basic Unigraphics functions. Among these are face oriented operations, constraint based methods, blend regeneration and independence of feature history. You can use Direct modeling functions on models that have been imported from other CAD systems and are non-parametric. 12) What is the limit for Undo? we can use Undo for 222 times or until up to last time saved. 13) How many colors in are there in UG? There are 216 colors in UG. 14) How many Layers are there in UG? There are 256 Layers in UG. 15) What are Grips? What are there uses? Grip programs can be executed as button action by specifying grip executable file names. The uses of Grip are 4. Simplify Repetitive Operations 5. Standardized Results

6. Interactive commands.

16) What do you meant by Weight Management? The Weight management option allow us to calculate and control the weight and other mass properties of parts, components and assemblies based on the solid bodies they contain. 17) What do you mean by Knowledge Fusion? The Unigraphics NX Knowledge Fusion application provides a graphical user interface that allows us apply engineering knowledge driven rules and design intent to geometric models and assemblies in Unigraphics. 18) What are the different types of modeling? There are four types of modeling. 7. 8. 9. 10.

Solid Modeling Feature Based Modeling Free Form Modeling Sheet Metal Feature Modeling

19) What is Parasolid? Para solid is form of translator which is used to open the higher version Unigraphics part files to in lower version of Unigraphics. For example we can open the NX7.5 version part files in NX4. 20) How can we create a mosquito coil? We can create a mosquito coil by first creating an inclined helix curve and then projecting it to the bottom plane. Then we need to use the sweep along guide command. 21) What is Datum Plane? Why it is used? Datum Plane is reference feature that can be used to as construction tool in building the model.

22) What is Datum Axis? Datum Axis, which is a reference object you can use to create other objects, such as Datum planes, revolved features, and extruded bodies. Datum Axis can be either relative or fixed. 23) What is constraint? Constraints limit structural movement and represent mounts and supports. Constraints can be applied to faces or edges. (Restricting the degree of freedom) 24) How many types of constraints are there? There are two types of constraints. 1) Geometrical constraints 2) Dimension constraints 25) What is sketching plane? To create a sketch, you must associate the Sketch feature to a planar object. We can select a face or Datum plane. This plane is know as sketching plane.

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26) What is the expansion of IGES, STEP, DXF? IGES – Initial Graphic Exchanges Specifications. STEP – Standard For The Exchange of Product Model Data DXF – Data Exchange Format 27) What is Co-ordinate System? How many types of Co-ordinate Systems are there in Unigraphics? Co-ordinate System is a reference element. It uses X,Y and Z co-ordinates while creating model. Following are the three types of Co-ordinate Systems

1. 2. 3.

Work Co-ordinate System Absolute Co-ordinate System Existing Co-ordinate System

28) What is the difference between Rotational WCS & Dynamic WCS? In Rotational WCS we can give the angle by which the WCS need to rotate by typing it in the space provided, while in Dynamic WCS we can dynamically rotate the WCS and give the angle. 29) What is the difference between Sketch Curves & Basic Curves? Sketch curve are parametric and can constrain but basic curves are non parametric and cannot constrain them. 30) How many types of geometrical constrains are there in Unigraphics NX? There are 22 types of Geometrical constrains in Unigraphics NX. 31) How many layers are there in Unigraphic (UG)? There are 256 layers in Unigraphics. 32) In which command do you find strings, apex string, and spline string? We find these options in section command of free form feature. 33) Where do you find bounded plane command? We find the Bounded plane command in Insert –> Surface –> Bounded Plane. 34) What is meant by Master Model Concept? The idea of virtual assembly taken to its logical conclusion leads to Master Model paradigm. In this concept a master model of the component is designed and the same is referred by those in assembly, drafting, analysis and manufacturing department of the particular company. 35) What is the displayed part and work part. Where does it come? Displayed parts are the parts which can only be displayed but not editable while we can both display and edit a work part. Both displayed part and work part comes under assembly.

36) What is Reattach? In Reattach, You can reattach a already created sketch to a different planar face or datum plane. 37) What is string mode? String mode is an option which is available while creating lines and arc using basic curves. When the string mode is selected we can draw continuous lines or arc. If the string mode is not selected we can create only one line or arc at a time. 38) What is Reference Set? Reference set controls the the amount of data that is loaded from each component and viewed in context of an assembly. (Data likes Datum Planes, Axis, Solid body, Sheet body, Sketches, Curves etc) 39) What is Top Down Assembly? In top down assembly we create the different parts in the same assembly file and assemble it there itself. 40) What is Bottom Up Assembly? In bottom up assembly we create the different parts of an assembly in separate file and then get them and assemble using constraint. 41) How many mating constraints are there in assembly?

There are 8 mating constraints in assembly. Mate, Align, Angle, Parallel, Perpendicular, Center, Center, Distance and Tangent. 42) How many ways to find the sketch is fully constrained in Unigraphics? There are three ways to find the sketch is fully constrained. 1) In sketch environment (status bar) 2) In part navigation 3) Checkmate 43) What do mean by NURBS? NURBS is Non Uniform Rational Bezier Splines. 44) What is B surface? B surface is Bazier surface. 45) What is the use of Expand command? Expand command is used in Drafting. In the drafting application you can use expand to create and edit objects in specific view. 46) What is Section Strings? Section strings is defined as the curves which represent the section of the profile in Sweep along guide or Swept command.

47) What is single segment in Tube? By using single segment option in Tube we get a single smooth solid along the guide curve. 48) What is law curve? The law curve option lets you create a spline using the law Sub-function. A law spline is defined by a set of X, Y, and Z components. You must specify a law for each of these three components. 49) What is the default tolerance for angle and distance in Unigraphics? Angle – o.5 Distance – 0.0254 50) What is the minimum blend radius for a sheet metal? The minimum blend radius is part tolerance. 51) What are primitives? Primitive features are the basic analytic shapes. They are non associative, meaning they are not associated to geometry used to create them. 52) How many primitives are there in Unigraphics? There are four primitives. They are Block, Cylinder, Cone and Sphere. 53) In Ruled features how many section strings are necessary? In Ruled feature two section strings are necessary. 54) Where will we use primary strings and cross strings? We will use primary strings and cross strings in Through Curve Mesh option for creating a free form feature. 55) How many numbers of characters can be used for part file name? We can use 37 characters for a part file name. 56) What is the difference between Face blend and Soft blend? A face blend can be created between the faces of solid and / or sheet bodies. The faces can be non adjacent and/ or part of a different sheet body. Soft blends let you create blends whose cross sectional shape is not circular. 57) What is the difference between datum plane and fixed datum plane? A Datum plane is a reference plane that serves as aid when existing planes are not available. The datum plane can be editor later. The fixed datum plane are datum planes which cannot be edited later.

58) How Can we identify the Manually edited dimensions in Drafting? We can identify by going to Information –> Others –> Object – specific –> Dimension with Manual Text. 59) How many types of views can we create in a drafting? We can create 11 types of views in drafting. 60) What is the maximum number of guide curves used in Swept operation? The maximum number of guide curves used in Swept operations is Three (3).

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Unigraphics (UG) is one of the widely used CAD/CAM/CAE software in the world. Find below the Unigrpaics interview questions. UG interview questions: Part 2 16) Is it possible to sew solids in Unigraphics? 17) How can you duplicate a body and still maintain its parameters? 18) What is extract body and time stamp in Unigraphics? 19) What is the difference between? Fillet and Blend, Trim and Split, Trimetric and Isometric Fixed, Datum and Relative Datum, Orthographic Views and Auxiliary Views, Edit Curve and Edit Curve Parameters 20) What is the default tolerance for angle, intersection dist, model and curve in Unigraphics? 21) What are single segment and multiple segments in a tube? 22) What are primitives? 23) What is feature based modeling? 24) What is sketch based modeling? 25) Explain the different types of Coordinate systems in Unigraphics? 26) What is NURBS? 27) What are Iso parameters? 28) How do you create a variable blend in Unigraphics? 29) Explain the following with respect to Unigraphics Through Point, Through Poles, Through Cloud Points 30) Explain the difference between swept and sweep along guides in Unigrphics? 31) What is a Law Curve in Unigrahpics? Answers to UG interview questions: Part 2 16) Yes, it is possible to sew solids in Unigraphics. Insert > Form Feature > Sew > Solids > Select the faces in the target and the tool bodies > If the Target areas and Tools areas (Dialog Box) are with in tolerance then it will sew the solids. 17) Insert > Mirror Body 18) The Extract Geometry option in Unigraphics, lets you create associative copies of curves, faces, or bodies. Time stamp when toggled on will not extract the features created after Extracted body. 19) Fillet and Blend: Fillet is for 2D curves or sketches Blend is for 3D features Trim and Split: Trim is Parametric, Split is unparametric Trim removes a part of the body, Split divides the body in to two parts Trimetric and Isometric: Trimetric is inclined at angle of 30 deg with respect to the +ve X – axis Isometric is Inclined at angle of 45 deg with respect to the +ve X – axis Fixed Datum and Relative Datum: Fixed datum are not referenced or not constrained to any geometric objects except that of user defined

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Relative datum’s are referenced or relative to the geometric objects like curve, features or fixed datum’s Orthographic Views and Auxiliary Views: Orthographic views are standard views such as Front, Top, Right views etc, Auxiliary views are views that are used to show true size of a face of a part which may not be possible in Orthographic views

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Edit Curve and Edit Curve Parameters: Edit curve includes trim, trim to corner, stretch etc..,. Edit curve parameters gives us the flexibility of changing the curve parameters such as length,

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diameter, angle etc..,. 20) Default tolerance angale in Unigraphics for angle, intersection dist, model and curve is 0.0200mm 21) Single Segment as the output type, the resulting tube will have a single B-Surface face for each curve. Once specified this option cannot be changed during the edit option. Multiple segments will give multiple faces for each spline in the string, and they will be analytic face. 22) The primitive approach views a solid model as a combination of simple, generic & standard shapes that can be combined. Primitive shapes include cubes, sphere, cone, wedge etc..,. 23) The feature based modeling is similar to primitive based modeling it replaces primitives with features such as Extrusion, Revolve etc.., and embeds Boolean operations in the feature definition. 24) The sketch based modeling is similar to feature based modeling except that allows the user to create more elaborate & more general feature other than using predefined shapes. 25) Model Coordinate system (MCS): It is defines as the reference space of the model with respect to which all the model and geometrical data is stored. It is a Cartesian system. The default sketch planes indicate the 3 planes of MCS and their intersection is the origin. Work Coordinate System (WCS): The WCS is a convenient user defined system that facilities geometric construction. It can be established at any position and at any orientation in space that the user desires. The WCS requires 3 non collinear points to define its XY plane. Screen Coordinate System (SCS): The SCS is defined as a 2D device dependent coordinate system. 26) NURBS is an acronym for Non Uniform Rational B- Spline 27) Iso parameters blends are used in creating a blend between the turbine blades and the hub. It gives the flexibility of creating the blend which may follow a define string which may either be Linear, Cubic, Law curve, Constant, Equation etc..,. The other blend type includes Disc blend, conic, sphere and Iso parametric. 28) Insert > Feature Operations > Edge Blend > Toggle on Allow Variable and Setback > select the edge > select the point and the corresponding blend values. 29) Through Points : It can be employed when creating a sheet using row of points Through Poles : sheet is generated by selecting the first and the last points in n rows Through Cloud Points : It passes through specified array of points Note: The above three methods are Unparametric Ruled : It creates sheet between two section strings only Through Curve : It is similar to Ruled. It creates sheet between N section strings. Through Curve Mesh :It creates sheet using Primary Strings and Cross Stings Primary Strings should be approximately one directly (i.e., roughly parallel). It can be in the range

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of 2 -150 strings Cross Strings should be approximately perpendicular to the primary strings. They can be in the

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range of 2-150 strings There may be no constraint or the constraint may either be tangent or continuous curvature Swept : A swept feature is a body swept out by section strings moving along guide string. Swept feature can either be solid or sheet bodies. Guide Strings are in the range of 1 - 3. The guide string may be made up of many segments Section strings are in the range of 2 - 150 Quilt : A quilt feature is a single, four sided, bi cubic (degree 3 x 3) approximate surface, untrimmed, BSurface sheet

30) Swept -> 3 Guide strings and Max of 150 sections string. It easily follows the guide strings (i.e., it doesn’t undergo any twist as it moves along the guide string) Sweep along guide ->1Guide String & 1 section string. It undergoes twist ( Ex. Section moving along a helix) 31) In Unigrahics Law Curve is a Feature, which has a level of control over its properties, represented in a Law Curve Frame or graph. The X and Y values of the graph are both Properties of the Law Curve. When we draw a graph we draw an X direction and a Y direction. The X direction is the Independent and the Y direction is the Dependant(X can go where it likes but Y is dependent on where X is, as it’s always perpendicular to it). To discuss further on these questions use the Unigraphics section of the Forum.

Find below the Unigraphics interview questions for design engineers. In this series only questions are provided, Use the product design forum to discuss further on the solutions to the following questions. Explain the following: 1.Product life cycle management (PLM) 2.Team centre 3.Master model concept 4.I-MAN5.Grip 6.Interoperate 7.Examine geometry 8.Global Shaping 9.Part cleanup 10.Quick stack 11.Knowledge fusion 12.WAVE 13.Promotion of bodies 14.Cloning 15.Zone 16.Envelope 17.Component filter 18.Weight management 19.MACRO 20.Load Options -File 21.Smart model 22.Part families 23.UDF 24.Sheet to solid assistant 25.Quality checks of model in Unigraphics 26.What is law curve? 27.What is rho? 28.What is the limit for undo? 29.How many colors are there in UG? 30.How is tube shown in model tree? 31.What is a pattern face? 32.Explain Heal geometry? 33.What is Para Solid? 34.What is direct modeling? 35.How do you export the model in STL format? 36.What is Timestamp?

Explain difference between the following with respect to Unigrahics: 1.Class A & Class B surfaces 2.Surface & B-Surface 3.IGES & STEP 4.Orient view & replace view 5.Higher & lower degree curves/surfaces 6.Cubic & quintic 7.Spline and Spine 8.Curve and String 9.Face blend & edge blend 10.Sheet from curve & bonded plane 11.Sew & quilt 12.N sided surface & Bonded plane and Sheet from curves 13.Through curves & ruled 14.Swept and Through curve mesh 15.Cylinder & Boss 16.Through point & through poles 17.Top down and Bottom up assembly 18.Wave link & Promotion 19.Mate & align 20.Instance & transform 21.Trim & patch 22.Blank & suppress & layer 23.Fixed datum plane & relative datum plane 24.Define mating alternatives and verify mating alternatives 25.Simple instance & identical instance & general instance 26.Trim & split 27.Simplify & join 28.Intersect & section – curve operation 29.Orthographic view & auxiliary view 30.Geometric tolerances & dimensional tolerances 31.Work part & displayed part 32.Flatness & parallelism 33.Architectural feet inches & engineering feet inches 34.Offset & Extrude 35.Drafting and Detailing

Unigrahpics is one of the widely used CAD/CAM/CAE software in the engineering industry. Unigraphics is a family of integrated CAD/CAM/CAE/PLM applications, which supports both product and process complexity inherent in the enigneering field. Following is the 4th part of Unigraphics interview questions, use Unigraphics board of the forum to discuss solutions to these questions.

Unigraphics general interview questions:

General interview questions continued...

25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35. 36. 37. 38. 39. 11. How to insert sketch dimensioning & feature 40. 41. dimensioning in drafting? 1. Explain types of Modeling? 2. Explain types of Coordinate systems in Unigraphics? 3. What is reverse engineering? 4. What is continuity? Explain different types of continuity. 5. Advantages of UG over other CAD packages? 6. What are the types of dimensioning? 7. How to create your own symbols in drafting? 8. What is dual dimensioning? 9. What is the deference between break line details & bounded by objects? 10. What is the use of Reference sets?

What is the use of part list? What is the use of visible in view? What is the use of overflows in blend? What are silhouette curves? What is combined projection? What is swoop? What is law curve? What is rho? What is the limit for undo? How many colors are there in UG? How is tube shown in model tree? What is a pattern face? Explain Heal geometry? What is Para Solid? What is direct modeling? How do you export the model in STL format? What is Timestamp?

12. Write the symbol for hole dimensioning? 13. What does the error message non manifold Unigrahphics Tricky interview questions: mean? 14. How to remove parameters of a model and 1. How to retrieve back the model you didn’t save (power problem or UG window closes due to some error) retrieve it back? 2. How to edit the location of a detailed view? 15. What is view dependent edit? 16. What is the use of edit section components 3. How to convert a model created in inches to MM? 4. What is the limit for sheets in drafting? in view? 5. How to create a mosquito coil? 17. How to find out manually altered 6. How to create knurling? dimension? 7. How to taper 1/4 of a face? 18. How to reduce decimal places in 8. How to blend a cone? How to convert a block to sphere (avoid information window? 19. What is the use of unfolded section cut in blending)? 9. How to construct a block with a line in a single operation? drafting? 20. How to fully constrain a spline in sketch? 10. Advantages of surface modeling over solids 11. Advantages of solid modeling over surfaces 21. What is routed relief? 22. What is Conditional Operator – Expression?12. Which is the alternative to unite? 13. How to find Center of Gravity? 23. How to confirm: 14. What is Degree of Freedom? How many degree of freedom • Sketch is fully constrained? will be there for a mechanical object? • Components of assembly are completely mated?

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