Here are a few tips for you:
a) Ask the Technical Team to prepare the Job Description for the position, including the years of experience and technical knowledge know-how, topic-wise.
b) Try to equip yourself with the basics of each technology to have an understanding of what those technologies are and their use in software.
c) Start framing a questionnaire (FAQ) on the technologies with the help of the Software Team members and the answers for them. Please use Google if you have any confusion for clarification.
d) Start asking the candidates about their understanding of each technology in every interview and understand the answers given by them.
I am sure that at the end of completing 15-20 interviews, combined with your inquisitiveness to know about the technology, you shall rise to the occasion. I see a day when you can start doing the preliminary technical interviews by yourself.
There is nothing in the world that we cannot understand. So, go ahead and start learning.
Wishing you all the luck.