Monday, 14 November 2011

UG interview quesions:Part 3

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: 
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
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..,.
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 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
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).

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