Networks Analysis and Synthesis - Engineering

Q1:

In figure, capacitor is used to develop pulses of short duration and large duty cycle across R2 when switch is closed. Which of the following combinations is best suited?

A R1 and R2 large but C small

B R1 and R2 small but C large

C R1 and C large and R2 small

D R2 and C large but R1 small

ANS:C - R1 and C large and R2 small

Large values of R1 and C mean large time of charging C and hence large duty cycle. Small value of R2 ensures that duration of pulses is small.