Question

Compare a step-up transformer with a step-down transformer based on the number of loops in the primary and secondary coils.

Answer 1

Step-up transformer increases the magnitude of input voltage of primary coil. In step-up transformer, primary coil has less turns than secondary coil.
Whereas step-down transformer decreases the magnitude of input voltage of primary coil. In step-down transformer, primary coil has more turns than secondary coil.