This set of Solid Modelling Multiple Choice Questions & Answers (MCQs) focuses on “Solid Representation”.

1. Which of the following is not the application of solid representation scheme?

a) Mass property calculation

b) Finite element modelling

c) Interference analysis

d) Generation of orthographic views

View Answer

Explanation: Solid representation scheme permits automation and integration tasks such as mass property calculation, finite element modelling, interference analysis, machine vision, etc. In order to generate orthographic views, edge representation method is used.

2. Which of the following is not the formal property of solid representation scheme?

a) Validity

b) Indistinctness

c) Unambiguousness

d) Uniqueness

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Explanation: The formal properties of solid representation scheme are domain, validity, uniqueness and unambiguousness which determine the usefulness of representations in solid modelling. But solid representation should not be indistinct, it leads to invalid data input to the system.

3. What is the main purpose of conversion of solid model to an edge representation?

a) To generate isometric view

b) To generate wireframe view

c) To generate shaded view

d) To generate orthographic view

View Answer

Explanation: Conversion of a solid model to an edge representation is mainly used to generate orthographic view for display and drafting purposes. These views are generated automatically. But they are not dimensioned automatically and a manual or semiautomatic dimensioning is required.

4. Which of the following expression defines solid model of an object as a point set S in 3D Euclidean space?

a) S = iS bS

b) S = iS bS cS

c) S = kS

d) kS = iS bS

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Explanation: Solid model of an object is defined as a point set S in 3D Euclidean space by the equation S = iS bS where, iS and bS are the interior and boundary of the set respectively. Here, the point set S that defines a solid model is always a regularized set with well-behaved boundaries.

5. Rigidity property of solid model implies that its shape depends on the model’s location or its orientation in space.

a) True

b) False

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Explanation: Rigidity of solid model implies that its shape does not depend on the model’s location or its orientation in space. It also implies that shape of solid model is invariant and remains unchanged after any operation or transformation applied to the solid model irrespective of its location.

6. What is the meaning of ‘closed regular set’ in solid representation?

a) Set is closed and has no dangling portions

b) Set does not oscillate anywhere within the set

c) Set is closed and has dangling portions

d) Set does oscillate anywhere within the set

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Explanation: A ‘closed regular set’ means the set is closed and has no dangling portions. It is a subset of space E3 with no floppy faces or edges. Whereas the ‘semianalytic set’ means that the set does not oscillate anywhere within the set and used to select surface equations of solid models.

7. What does the completeness property of solid representation scheme determine?

a) Geometric coverage of scheme

b) Object equality

c) Ability of scheme to support analysis of the system

d) Ability of scheme to store the data

View Answer

Explanation: The completeness property of solid representation scheme determines the ability of scheme to support analysis of the system and other engineering applications. A complete scheme must provide models with sufficient data for any geometric calculation to be performed on them.

**Sanfoundry Global Education & Learning Series – Solid Modelling.**

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