Mass transfer will almost always occur for spectroscopic and eclipsing binaries.

Question

Quizplus · Accepted Answer

Mass transfer occurs in spectroscopic binaries as the stars are close enough that the gravitational pull can cause material to flow from one star to the other. In eclipsing binaries, mass transfer can occur if one star is larger and is transferring material onto the smaller star. Mass transfer occurs in binary systems where one star transfers material to its companion, and this is often observed in spectroscopic and eclipsing binaries.

Mass Transfer Will Almost Always Occur for Spectroscopic and Eclipsing