If your HTML is:
Use:
$("#cmbOperator option[value='" + name + "']").attr('selected', 'selected');
- Selects based on the 
value attribute. 
or
$("#cmbOperator option:contains('" + name + "')").attr('selected', 'selected');
- Selects based on the text content.
 
If your HTML is:
Use:
$("#cmbOperator option:contains('" + name + "')").attr('selected', 'selected');