Comparator

Ask

 If the input to a comparator is a sine wave, the output is a

(a) ramp voltage

(b) sine wave

(c) rectangular wave

(d) sawtooth wave

Answer is (c)

Concept

Comparator compares the input value with a reference voltage and returns either high or low depending on the comparison operator (greater/lesser/greater than or equal to/less than equal to/equal to and so on). Thus the output waveform will have only two levels, high and low which further yields a rectangular wave.