how to check which version of Kernel I'm using?

Hello guys,
I'm new to Nexus 5 as well.

I have been using Chroma for few months now/
http://forum.xda-developers.com/goog...ayers-t3069105

The version I installed on mine is: 8-10-2015 built.

I have been following the post lately,
many people said, 'franco.Kernel' is a good Kernel.

how do I check if I already have franco kernel installed?

I went to About page, it says: 3.4.0-gbebb36b android-build@vpbs1.mtv.corp.google.com#1

also,
if I want to go with franco kernel, what advantages will i get?
do i just need to download this app thru google play to install the franco kernel?
https://play.google.com/store/apps/d...co.kernel.free