I've just installed Apache 2.4.7 (Ubuntu) on my Ubuntu 14.04 LTS system and can't see neither prefork nor worker settings in the /etc/apache2/apache2.conf. They are also not defined for default virtual host. Should I set them myself in apache2.conf like this?

<IfModule mpm_prefork_module>

    StartServers 2

    MinSpareServers 2

    MaxSpareServers 5

    MaxClients 200 #must be customized

    ServerLimit 200 #must be customized

    MaxRequestsPerChild 100

</IfModule>