Question

1. which button allows you to select and modify the duty cycle (symmetry) of the square and triangle waveforms ?

Explanation:

The "DUTY" button is typically used to select and modify the duty - cycle (symmetry) of square and triangle waveforms. In waveform - generating equipment, this button is dedicated to adjusting the proportion of time the waveform is in its high state within one cycle.

Answer:

E. DUTY