# Engineering Drawing Questions and Answers – Basics of Section of Solids

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This set of Engineering Drawing Multiple Choice Questions & Answers (MCQs) focuses on “Basics of Section of Solids”.

1. To understand some of the hidden geometry of components an imaginary plane is used to cut the object which is called _____________
a) auxiliary plane
b) picture plane
c) section plane

Explanation: To understand some of the hidden geometry of components an imaginary plane is used to cut the object which is called section plane or cutting plane. The new imaginary face generated on the object is called the section.

2. Which of the following is not the purpose of using cutting (section) plane?
a) Interpretation of object
b) Visualizing of object
c) Cutting the objects
d) Invisible features

Explanation: Section plane or cutting plane is an imaginary plane which is used to cut the object to visualize the geometry which is hidden inside the object and interpret it which plays an important role in designing many machine parts.

3. To find the true shape of the section, it must be projected on a plane parallel to the _____________
a) Profile plane
b) Vertical plane
c) Auxiliary plane
d) Section plane

Explanation: As we know true shape and size is obtained only when an object is projected on to the plane parallel to it. Likewise, as section always be plane surface to know its true shape it should be projected on to plane parallel to section plane only.

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Explanation: Continuous thick line is used for visible out-lines, dashed lines are used for line showing permissible surface treatment, long-dashed dotted lines are used for indication of surfaces for which a special requirement applies.

5. A section plane is parallel to V.P the top view gives ___________ which is _________ to xy line.
a) true shape, parallel
b) straight line, parallel
c) straight line, perpendicular
d) true shape, perpendicular

Explanation: The projection of section plane on the plane to which it is perpendicular gives a straight line which is parallel, perpendicular, inclined as due to section if it is parallel, perpendicular, inclined to reference planes.

6. The projection of a section plane, on the plane to which it is perpendicular is a straight line.
a) True
b) False

Explanation: The projection of a section plane, on the plane to which it is perpendicular is a straight line. The projection of a section on the reference plane to which the section plane is perpendicular will be a straight line coinciding with the trace of the section plane of it.

7. The projection of section surface on the other plane to which it is inclined is called auxiliary section.
a) True
b) False

Explanation: No it is not auxiliary plane but apparent section. This is obtained by projecting on the other plane, the points at which the trace of the section plane intersects the edges of the solid and drawing lines joining these points in proper sequence.

8. The section plane is perpendicular to H.P and inclined to V.P the front view of section if section is a line. It ________________ xy line.
a) is perpendicular to
b) is parallel to
c) is inclined to V.P
d) crosses

Explanation: The projection of section plane on the plane to which it is perpendicular gives a straight line. It is given the section is line and also from front view the section lies parallel to xy reference line.

9. The section plane is perpendicular to H.P and inclined to V.P the top view of section if section is a line. It ________________ xy line.
a) is perpendicular to
b) is parallel to
c) is inclined to V.P
d) crosses

Explanation: The projection of section plane on the plane to which it is perpendicular gives a straight line. Here it is given section plane is inclined with V.P so top view gives a line inclined to xy reference line.

10. A section is perpendicular to both the reference planes the true shape and size is obtained by taking projection of section on to _________ plane.
a) horizontal
b) vertical
c) profile
d) auxiliary

Explanation: Given the section is perpendicular to both horizontal and vertical plane that is it is parallel to profile plane which is otherwise called as picture plane. Always remember the true shape and size will be trace if projections are drawn on to the plane parallel to section plane.

11. A section is parallel to horizontal plane the true shape and size is obtained by taking projection of section on to _________ plane.
a) horizontal
b) vertical
c) profile
d) auxiliary

Explanation: Always remember the true shape and size will be trace if projections are drawn on to the plane parallel to section plane. So here as the section is parallel to horizontal plane the projection is to be taken on horizontal plane.

12. A section is parallel to vertical plane the true shape and size is obtained by taking projection of section on to _________ plane.
a) horizontal
b) vertical
c) profile
d) auxiliary

Explanation: Always remember the true shape and size will be trace if projections are drawn on to the plane parallel to section plane. So here as the section is parallel to a vertical plane the projection is to be taken on vertical plane.

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