MAE 1351 MODULE 4 EXAM 2025
QUESTIONS AND ANSWERS
ANSI Y14.5 - ANS The accepted national standard in the United States for dimensioning and
tolerancing. Published by the ASME (American Society of Mechanical Engineers)
Dimension - ANS A numerical value expressed in appropriate units of measure and used to
define the size, location, geometric characteristic, or surface texture of a part or part feature.
Arrowhead - ANS A small triangle at the end of dimension lines and leaders to indicate the
direction and extent of a dimension
Dimension Line - ANS A thin, dark, solid line that terminates at each end with arrowheads.
The value of a dimension typically is shown in the center of the dimension line. *A dimension
line, along with its arrowheads, shows the direction and extent of a dimension
Extension Line - ANS A thin, dark, solid line extending from a point on an object,
perpendicular to a dimension line. *Extension lines are used to indicate the extension of a
surface or point to a location preferably outside the part outline.
Leader - ANS A thin, dark, solid line terminating with an arrowhead at one end and a
dimension, note, or symbol at the other end. Used to Direct a dimension, note, or symbol to the
intended place on a drawing.
contour rule or contour dimensioning - ANS each dimension should be placed in the view
where the contour shape is best shown
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, Where the dimension is less than one millimeter, a zero precedes the decimal point. -
ANS Type of Dimensioning (1)
Where the dimension is a whole number, neither the decimal point nor the zero is shown. -
ANS Type of Dimensioning (2)
Where the dimension exceeds a whole number by a decimal fraction of one millimeter, the last
digit to the right of the decimal point is not followed by a zero. - ANS Type of Dimensioning
(3)
Neither commas nor spaces shall be used to separate digits into groups in specifying millimeter
dimensions on drawings (e.g., 1000 not 1,000) - ANS Type of Dimensioning (4)
A zero is not used before the decimal point for values less than one inch. - ANS Type of
Dimensioning (5)
A dimension is expressed to the same number of decimal places as its tolerance. Zeros are
added to the right of the decimal point where necessary - ANS Type of Dimensioning (6)
Each dimension shall have a tolerance. As was mentioned earlier in the chapter, tolerance
dimensioning is necessary to account for human imperfection and to allow for effective size
control. If a dimension does not appear as a limit dimension, the tolerance is usually covered by
a general note on the drawing or in the title block - ANS Fundamental Rule of Dimensioning
(1)
Dimensioning and tolerancing shall be complete so there is full understanding of the
characteristic of each feature. Drawings need to be dimensioned so the manufacturer or
construction worker does not have to guess at anything. It is your responsibility to provide all
necessary information to produce, manufacture, or build the design - ANS Fundamental Rule
of Dimensioning (2)
2 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
QUESTIONS AND ANSWERS
ANSI Y14.5 - ANS The accepted national standard in the United States for dimensioning and
tolerancing. Published by the ASME (American Society of Mechanical Engineers)
Dimension - ANS A numerical value expressed in appropriate units of measure and used to
define the size, location, geometric characteristic, or surface texture of a part or part feature.
Arrowhead - ANS A small triangle at the end of dimension lines and leaders to indicate the
direction and extent of a dimension
Dimension Line - ANS A thin, dark, solid line that terminates at each end with arrowheads.
The value of a dimension typically is shown in the center of the dimension line. *A dimension
line, along with its arrowheads, shows the direction and extent of a dimension
Extension Line - ANS A thin, dark, solid line extending from a point on an object,
perpendicular to a dimension line. *Extension lines are used to indicate the extension of a
surface or point to a location preferably outside the part outline.
Leader - ANS A thin, dark, solid line terminating with an arrowhead at one end and a
dimension, note, or symbol at the other end. Used to Direct a dimension, note, or symbol to the
intended place on a drawing.
contour rule or contour dimensioning - ANS each dimension should be placed in the view
where the contour shape is best shown
1 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
, Where the dimension is less than one millimeter, a zero precedes the decimal point. -
ANS Type of Dimensioning (1)
Where the dimension is a whole number, neither the decimal point nor the zero is shown. -
ANS Type of Dimensioning (2)
Where the dimension exceeds a whole number by a decimal fraction of one millimeter, the last
digit to the right of the decimal point is not followed by a zero. - ANS Type of Dimensioning
(3)
Neither commas nor spaces shall be used to separate digits into groups in specifying millimeter
dimensions on drawings (e.g., 1000 not 1,000) - ANS Type of Dimensioning (4)
A zero is not used before the decimal point for values less than one inch. - ANS Type of
Dimensioning (5)
A dimension is expressed to the same number of decimal places as its tolerance. Zeros are
added to the right of the decimal point where necessary - ANS Type of Dimensioning (6)
Each dimension shall have a tolerance. As was mentioned earlier in the chapter, tolerance
dimensioning is necessary to account for human imperfection and to allow for effective size
control. If a dimension does not appear as a limit dimension, the tolerance is usually covered by
a general note on the drawing or in the title block - ANS Fundamental Rule of Dimensioning
(1)
Dimensioning and tolerancing shall be complete so there is full understanding of the
characteristic of each feature. Drawings need to be dimensioned so the manufacturer or
construction worker does not have to guess at anything. It is your responsibility to provide all
necessary information to produce, manufacture, or build the design - ANS Fundamental Rule
of Dimensioning (2)
2 Copyright ©2025 SIRJOEL ALL RIGHTS RESERVED
