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Responses to a survey can be limited using Automatic Quota Control. For example: If you want 75 responses for you survey then you can set this up under Automatic Quota Control. Go to:
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Quota Control is activated only once the set number of Complete Responses are saved. If respondents have already started taking the survey and while they are completeing the survey the quota is reached, they will still be able to complete the survey. This is the reason why there might be slightly greater number of completed responses than the quota set.
By default Survey Quota is set to 0. Survey Quota = 0 allows unlimited responses to the survey. If you have enabled Quota Control and later on wish to remove it, update the Survey Quota value to 0.