Which waveform has linear ramps up and down?

• A. Triangle Wave
• B. Sawtooth Wave
• C. Sine Wave
• D. Square Wave

Answer: (A)

The waveform in which the amplitude changes with straight, constant slopes in both directions is the one that ramps up linearly and then ramps down linearly. In a triangle wave, each half cycle is a straight line: it rises at a constant rate from minimum to maximum, then falls at the same constant rate back to minimum. This creates the characteristic V-like shape with linear ramps.

Other waveforms don’t have that double linear ramp. A sawtooth has a linear rise in one direction but a sudden drop in the other, so it doesn’t ramp both ways. A sine wave follows a smooth curved path, not straight-line ramps. A square wave sits at two levels with instant transitions, so there are no ramps at all.

Triangle waves are often produced by integrating a square wave, which converts the abrupt transitions into constant-slope ramps, reinforcing why their up-and-down ramps are linear.