Question

Question #5f3ca

Answer 1

We can try to reduce heat dissipated.

Explanation:

Considering that:

You can see that the efficiency depends heavily upon the heat `Q_2` discarded into the cold reservoir so that the efficiency will always be `<1` (or `1-`something)..
If we want to increase efficiency we can try to reduce as much as possible `Q_2`, for example, reducing friction and heat dispersion.
We will never be able to make it zero though!!! So our efficiency will always be less than 1 (less than 100% which means we will never reach total conversion of heat into work).