Why can't display all installed kernel with rpm -q

Sat May 13 00:47:08 UTC 2006

The system is with a 3 GHZ p4 cpu, and installed kernel 2.6.15-1.2054_FC5smp, updated to 2.6.16-1.2111_FC5smp, when I issued command rpm -q kernel try to list all  the installed kernels, I got displayed "package kernel is not installed", do I miss  any thing? How to use rpm command to display all installed kernels?
thks
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