Explanation: Control element refers to the various blocks in the whole control process and the various control elements can ce controller as control valve, potentiometer, servomotors and tachometers but potentiometer is not the final control element.

Explanation: Proportional band of controller is the range of measured variables through which the air output changes from maximum to minimum.

Explanation: In pneumatic control system the control force is the air and and can be used as final control element converts the pressure signal to position change.

Explanation: Pressure error is the error that is caused due to change in the pressure and the error can be measured by differential bellows and strain gauge which is by the change of dimensions.

Explanation: Dimensions of the container can be changed by conversion of the coordinates and this can ne done with the help of the synchro-resolver.

Explanation: Error damping refers to the error that is caused by the damping in the system and the effect of this error damping is that it reduces the steady state error and gain of the system reduces.

Explanation: Root locus is the locus of the system that is drawn by the change in the gain with respect to the frequency and this technique gives the quick transient and stability response of the system.

Explanation: A phase lag lead network is the network that is similar to the differentiator and it is used to increase the speed response and increases the stability of the system and this introduces lag at low frequencies and lead at high frequencies.

Explanation: Non-linearity is the irregular variation in the two parameters of the servomotor and this is caused by the saturation in the servomotor.

Explanation: Zero initial condition refers to the condition in which the stored energy is zero and hence the system implies that the system is at rest without any energy stored in it .