Why are there different length Falcon mortise cylinders?

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Unless otherwise specified on an order, the cam supplied on Falcon mortise cylinders will be the following: Non-IC mortise cylinder is the 5622-STD. IC mortise cylinder is the 5622-IC. Related...
Cams for other applications may be specified with no additional charge, see pricebook.
Typically for a 1-3/4" door you would use a 1-1/4" cylinder.  Use the Table in the Pricebook for a reference:  
There are different mortise cylinder length options depending on the cylinder type. Below is a list of available options for conventional, FSIC, and SFIC cylinders, as well as the convent...
These cylinders are designed with a microswitch attached to the back of the cylinder. The switch is operated by a cam when the key is rotated.   To order: XB09-195 Mort...
The XB09-195, XB09-795, and XQ11-804 are basically modified mortise cylinders. The overall length of the mortise cylinder switch is approximately 1-9/16" (1.563"). The diameter of the cylinder face...
A modular cylinder's length is determined by 4 basic parts; a cam screw, cam, plug extension, and a back housing.  Most of these parts are used in more than one cylinder length and...