Q. In the following sentence, should the word “point” be singular or plural? “The type should be no larger than 11 point.”

A. It should be “points,” plural, but it would become singular “point” if used as a modifier:

the type is 11 points
11-point type

All this changes if you use an abbreviation:

the type is 11 pt.
11 pt. type

Not only is “pt.” preferred for both singular and plural, but “11 pt. type” has no hyphen. For the first convention, see CMOS 10.65. For the second, see the hyphenation guide at CMOS 7.89, section 1, “number + abbreviation.”