Change Default Post Title from Admin panel

function change_default_title( $title ) {
    $screen = get_current_screen();
    switch ($screen->post_type) {
    case 'qtrotator':
    $title = 'qtrotator';
    break;
    case 'page':
    $title = 'page';
    break;
    default:
    $title = 'Enter Default Post Title Heree';
    break;
    }
    return $title;
}
add_filter( 'enter_title_here', 'change_default_title', 10, 2 );