Test: Controllers & Compensators - 1 - Electronics and Communication Engineering (ECE) MCQ

Match List-I (Type of controllers) with List-II (Operation) and select the correct answer using the codes given below the lists:
List-I
A. Hydraulic controller
B. Pneumatic controller
C. Electronic controller
List-II
1. Fire and explosion of proof operation
2. Flexible operation
3. High torque, high speed operation 

Consider the following statements related to compensators used in control system applications:
1. When transient response is satisfactory and steady state characteristics are not satisfactory, normally lag compensation is employed.
2. Phase lag network is used to increase system stability and maintain velocity gain constant.
3. The capacitance is not used to fabricate a lag network.

Which of these statements is/are correct?

The transfer function of a phase-lead controller is given by

The input to a controller is

Addition of a pole to the closed-loop transfer function results in

Which of the following properties is/are not exhibited by a phase lead network?
1. The velocity constant is usually increased.
2. The slope of the magnitude curve is reduced at the gain cross over frequency.
3. The bandwidth is reduced.
4. The response becomes faster.

Assertion (A): If the phase shift decreases rapidly near the gain cross over frequency, phase lead compensation becomes ineffective.
Reason (R): The additional phase lead at gain crossover frequency is added to a much smaller phase angle than that at the old gain crossover frequency.