Automatic Control Systems - Engineering

Q1:

In the given figure, of potentiometer V0 = Vi (R0/Ri) only when

A RL = 0

B RL = ∞

C RL is neither low nor high

D RL is low but not zero

ANS:B - RL = ∞

If RL is not infinite, the voltage ratio of potentiometer depends on the value of RL. This is called loading effect.