Which one of the following is not a valid option of units command

SOLUTION

Units

Units is a generic term in AutoCAD, and it can cause a lot fo confusion to both new and experience users.

Its best if you specify what kind of units you mean.

Real world units:

• Real world units are the units you measure things with everyday.
• These units may be inches or miles or millimeter of kilometer, or yards or nautical miles.
• Real world units are established components of a uniform system of measure such as metric system.

AutoCAD units

The 5 types of linear units that AutoCAD uses are as follows.

Architectural

• This type of unit uses feet and inches with fractions. The sign for the foot is (‘).
• For example 2’-6 ½”. For this distance enter 2’-6½ or 2’-6.5.

Decimal

• This unit type uses decimal units that can represent any linear unit of measurement.
• We don’t use foot sign, inch sign or fraction sign in this, we need to convert feet into decimal.
• This method is especially common in civil engineering discipline where decimal units are used, and 1 unit is equal to 1 foot.
• Therefore, for the distance 2’ 6.5” you would need to convert the inches  (6.5 inches in this case) to the decimal equivalent of a foot (6.5/12 = 0.5417).
• So, in this case, you would enter 2.5417.

Engineering

• These units are just like architectural units except that inches are displayed as decimal rather than fractions.
• For a distance of 2’-6½”, enter 2’6.5 or 2.5417’.
• In either method, the resulting distance is displayed as 2’-6.5”.

Fractional

• This unit is equivalent to architectural units except there is no use of feet.
• Everything is expressed in inches and fractions.
• If you enter 30-1/2 or 30.5, the resulting distance displays 30½.

Scientific

• This unit system is similar to the decimal unit system except for the way in which distances are displayed.
• If you enter 3.05E+01, that is what is displayed.
• The notation always uses an expression that indicates a number from 1 to 10 that is to be multiplied by a power of 10.
• In this case, power is 1, so the notation means 3.05 × 10, or 30.5 in decimal units.