NX Interview Questions - Mechanical Engg - Civil Engg

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Mechanical Engg. Blog | CAD‐CAM‐CAE Blog | Civil Engg. Blog‐Pramit Kumar Senapati » Interview‐FAQs » NX interview Questions

NX interview 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 22 .Part families 23.UDF 24.Sheet to solid assistant 25.Quality checks of model in NX 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 NX: 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 alter natives 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 NX brain Teas interview questions: 1.

How to retrieve back the model you didn’t save power problem or UG window closes due to some

error 2.

How to edit the location of a detailed view?

3.

How to convert a model created in inches to MM?

4.

What is the limit for sheets in drafting?

5.

How to create a mosquito coil?

6.

How to create knurling?

7.

How to taper 1/4 of a face?

8.

How to blend a cone? How to convert a block to sphere avoid blending ?

9.

How to construct a block with a line in a single operation?

10.

Advantages of surface modeling over solids

11.

Advantages of solid modeling over surfaces

12.

Which is the alternative to unite?

13.

How to find Center of Gravity?

14.

What is Degree of Freedom? How many degree of freedom will be there for a mechanical object?

NX general interview questions: 1.

Explain types of Modeling?

2.

Explain types of Coordinate systems in NX?

3.

What is reverse engineering?

4.

What is continuity? Explain different types of continuity.

5.

Advantages of NX 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?

11.

How to insert sketch dimensioning & feature dimensioning in drafting?

12.

Write the symbol for hole dimensioning?

13.

What does the error message non manifold mean?

14.

How to remove parameters of a model and retrieve it back?

15.

What is view dependent edit?

16.

What is the use of edit section components in view?

17.

How to find out manually altered dimension?

18.

How to reduce decimal places in information window?

19.

What is the use of unfolded section cut in drafting?

20.

How to fully constrain a spline in sketch?

21.

What is routed relief?

22.

What is Conditional Operator – Expression?

23.

How to confirm:

•

Sketch is fully constrained?

•

Components of assembly are completely mated?

24.

What is appended text?

25.

What is the use of part list?

26.

What is the use of visible in view?

27.

What is the use of overflows in blend?

28.

What are silhouette curves?

29.

What is combined projection?

30.

What is swoop?

31.

What is law curve?

32.

What is rho?

33.

What is the limit for undo?

34.

How many colors are there in UG?

35.

How is tube shown in model tree?

36.

What is a pattern face?

37.

Explain Heal geometry?

38.

What is Para Solid?

39.

What is direct modeling?

40.

How do you export the model in STL format?

41.

What is Timestamp?

 Q&A NX : 1. Is it possible to sew solids in Unigraphics? 2. How can you duplicate a body and still maintain its parameters? 3. What is extract body and time stamp in Unigraphics? 4. What is the difference between? 5. Fillet and Blend, Trim and Split, Trimetric and Isometric Fixed, Datum and Relative Datum, 6. Orthographic Views and Auxiliary Views, Edit Curve and Edit Curve Parameters 7. What is the default tolerance for angle, intersection dist, model and curve in Unigraphics? 8. What are single segment and multiple segments in a tube? 22 What are primitives? 9. What is feature based modeling? 10. What is sketch based modeling? 11. Explain the different types of Coordinate systems in Unigraphics? 12. What is NURBS? 13. What are Iso parameters? 14. How do you create a variable blend in Unigraphics? 15. Explain the following with respect to Unigraphics 16. Through Point, Through Poles, Through Cloud Points 17. Explain the difference between swept and sweep along guides in Unigrphics? 18. What is a Law Curve in Unigrahpics?

 Answers to NX interview questions above 18 nos:

Yes, it is possible to sew solids in NX. 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. Insert > Mirror Body 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. 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 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 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, diameter, angle etc..,. Default tolerance angale in NX for angle, intersection dist, model and curve is 0.0200mm 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. 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..,. 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. 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. 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.

NURBS is an acronym for Non Uniform Rational B‐ Spline 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. Insert > Feature Operations > Edge Blend > Toggle on Allow Variable and Setback > select the edge > select the point and the corresponding blend values. 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 of 2 ‐150 strings Cross Strings should be approximately perpendicular to the primary strings. They can be in the 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, B‐

Surface sheet 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 In NX 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 .