Explanation: The maximum thevenin equivalent resistance Rmax occurs when the wiper is at the center of the potentiometer and the maximum thevenin equivalent voltage Vmax is equal to +Vcc or –Vee, when wiper is uppermost or lowest in the potentiometer. 3. What is done to compensate the voltage, when V1 > V2?
A. Move the wiper towards +Vcc
B. Move the wiper towards –Vee
C. Keep the wiper at the center of potentiometer
D. None of the mentioned
Answer:A
Explanation: The maximum thevenin equivalent resistance Rmax occurs when the wiper is at the center of the potentiometer and the maximum thevenin equivalent voltage Vmax is equal to +Vcc or –Vee, when wiper is uppermost or lowest in the potentiometer. 3. What is done to compensate the voltage, when V1 > V2?
A. Move the wiper towards +Vcc B. Move the wiper towards –Vee C. Keep the wiper at the center of potentiometer D. None of the mentioned
Explanation: V1 > V2 implies that output offset voltage is positive. This means that V2 should be increased until it is equal to V1. The wiper can be moved towards +Vcc until output offset voltage is reduced to zero.