how to create codeigniter form dropdown with validation

please provide the code to create two dropdown select items with validation in codeigniter.

view code

echo '<div class="form-group">';
        echo form_label('Type', 'type');
        $type = array('2'=>'FACULTY', '1'=>'ADMIN');        
        $type = array('2', '1');
        echo form_dropdown('type', $type, 'faculty','class="form-control input-md"');
        echo form_error('utype[]');
        echo '</div>';

        echo '<div class="form-group">';
        echo form_label('Status', 'status');
        $ustatus = array(
                  '1'  => 'ACTIVE',
                  '0'    => 'INACTIVE',
                );        
        $status = array('1', '0');
        echo form_dropdown('status', $ustatus, 'inactive','class="form-control input-md"');
        echo form_error('ustatus[]');
        echo '</div>';

controller code

 $this->form_validation->set_rules('utype[]', 'Type', 'required');
        $this->form_validation->set_rules('ustatus[]', 'Status', 'required');

remaining all input elements are validating properly bit confused with dropdown select validation. im using codeigniter for first time.