The Concept Simulator is basically a respondent Simulator. This can be used to determine what choices will be presented to the respondents when your survey is actually deployed. You can use this information to determine either the number of respondents you need to send the survey out to, or the Minimal Choice Count. With QuestionPro, you can use Concept Simulator in Conjoint analysis as shown below:
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 Go to: Add question » Advanced » Choice models » Conjoint. Conjoint Analysis question type will be added in the survey:
    
Click on "Design Type" and select Random
                
                       
              
    
You will see an option of Concept Simulator and Approx. no. of respondents dropdown in which you can select either of the below mentioned values - 
    
After selecting the desired no. of approximate respondents you want to simulate the results on, click on Simulate Concept Choices:
                
                       
              
    
The results will be displayed in the manner shown below: