Is it a good approach to ask a lot of questions to customers to conduct winning customer surveys?

It depends on how and who the customer is...for example I deal with a lot of owners/proprietress who look after the purchase part of their businesses.
They do not generally have the temperament of answering too many questions and might also give not-to-the-core honest answers in an attempt to ensure they do not give out too much classified information about the business.
At the same time down the line people like purchase managers, production managers etc might be more than willing to give as many answers as required and with all honesty.! Also, it is very important to frame the questions in a way that2 questions do not sound similar though both are targeting different set of information.
Lastly , of course asking as many "relevant" questions as possible will give you more data and hence a winning customer/consumer survey.!