# Flexible Manufacturing System Questions and Answers – Fundamentals of NC Technology – Set 2

This set of Flexible Manufacturing System Multiple Choice Questions & Answers (MCQs) focuses on “Fundamentals of NC Technology – Set 2”.

1. What are the two types of Motion Control systems for NC?
a) Static and Dynamic
b) Point-to-point and Continuous
c) Series and Parallel
d) Singular and Hybrid

Explanation: Point-to-point and Continuous are the two categories of Motion Control System of Numerical Control. It is based upon the path that the tool has to travel through the raw material to achieve the final dimension.

2. Which motion control system is also known as positioning system?
a) Continuous
b) Point-to-Point
c) Collinear
d) Collateral

Explanation: Point-to-Point motion control system is also known as positioning system. In this system, the worktable is moved to the programmed location regardless of the path necessary to get to that location.

3. Which motion control system involves continuous simultaneous control of two or more axes?
a) Continuous
b) Collinear
c) Point-to-Point
d) Retro

Explanation: The Motion control system which involves continuous simultaneous control of two or more axes is Continuous motion control system. Control over the tool trajectory relative to the work part is achieved in this system.

4. The Maximum error between the desired surface and the actual machined surface can be controlled by the lengths of individual line segments.
a) False
b) True

Explanation: The Maximum error between the desired surface and the actual machined surface can be controlled by the lengths of individual line segments. Accuracy of approximation can be controlled by maximum deviation.

5. Which term is used to define continuous path control used for simultaneous control of two or more axes in machining operations?
a) Contouring
b) Single Cutting
c) Intermittent Cutting
d) Curving

Explanation: In order to define continuous path control used for simultaneous control of two or more axes in machining operations, contouring is used. The offset must be provided here between cutting tool path and the part outline.

6. Which interpolation is used when a straight path is to be generated?
a) Linear Interpolation
b) Angular Interpolation
c) Polar Interpolation
d) Circular Interpolation

Explanation: In order to generate a straight path in continuous path Numerical Control system, linear interpolation is used. It is the most basic of interpolation technique used by the part programmers worldwide.

7. Which interpolation technique permits programming of a circular arc?
a) Rectangular Interpolation
b) Circular Interpolation
c) Angular Interpolation
d) Linear Interpolation

Explanation: A set of detailed step by step commands that directs the actions of processing equipments is known as Part Program. The commands are given based on the geometry of the part piece to be machined.

8. Which interpolation technique combines the circular interpolation with linear movement of a third axis?
a) Helical Interpolation
b) Linear Interpolation
c) Rectangular Interpolation
d) Angular Interpolation

Explanation: Part programs are prepared by part programmer. The duty of part programmer is to observe the dimensions of the final product and to provide commands to the machine to machine the product from the raw material.

9. If the work part is asymmetrical, the zero point will be defined at the centre.
a) True
b) False

Explanation: For symmetrical work part, the zero point will be defined at the centre of the profile. The Zero point will be communicated to the machine tool operator irrespective of the location.

10. Which interpolation technique has the capability of providing approximations of free from curves using higher order equations?
a) Rectangular Interpolation
b) Linear Interpolation
c) Circular Interpolation
d) Parabolic and Cubic Interpolations

Explanation: Parabolic and Cubic Interpolations have the capability of providing approximations of free from curves using higher order equations. They are not as common as linear and circular interpolations and require considerable computational power.

11. Which term is used to define continuous path control utilized for moving the tool parallel to major axis of the machine tool worktable?
a) Tool-cut NC
b) Straight-cut NC
c) Intermittent-cut NC
d) Single-cut NC

Explanation: In order to define continuous path control utilized for moving the tool parallel to major axis of the machine tool worktable, Straight-cut NC is used. This can be used in applications where the work piece will be flat and has simple profile.

Sanfoundry Global Education & Learning Series – Flexible Manufacturing System.

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