Control System MCQ With Answers

Answers - C) Major part of the automatic control theory applies to Linear Time invariant systems.

Answers - B)Traffic light system is an open-loop system.

Answers - A) Loop gain is the Product of every branch gains while traversing the forward path.

Answers - D) Impulse of an RL circuit is decaying exponential function.

Answers - A) Gain margin of the second-order system is infinite.

Answers - B) PID controller is the most powerful controller.

Answers - A) PD controller can handle fast process load changes.

Answers - B) Mechanism of control of body temperature is the feedback system.

Answers - D) Bandwidth is higher in the closed system than in an open-loop control system.

Answers - A) True. Effects of noise and disturbance on system performance can be reduced by feedback.

Answers - B) In feedback systems, multiple signals can be used.

Answers - A) True. An originally stable system can become unstable or more stable due to feedback.

Answers - B) A regenerative feedback indicates a positive sign.

Answers - D) The output of feedback control is a function of output and feedback signal.

Answers - B) A control system with excessive noise suffers from Saturation in amplifying stages.

Answers - C) Zero initial condition for a system means the system is at rest and no energy is stored.

Answers - B) Transfer function is used for finding output for any given input.

Answer - D) Sensitivity of closed-loop system to gain changes and load disturbances depends on Forwarding gain, Loop gain, and frequency.

Answers - A) For a desirable transient response of a second-order system, the damping ratio should be between 0.4 and 0.8

Answers - B) In the minimum phase system, all zeros lie in the left half-plane

Answers - B). Equating the denominator of the transfer function to 0, we would obtain poles.

Answers - D) Maximum overshoot is both function of damping ratio as well as a function of the natural frequency of oscillation.

Answers - C) Under damped system is preferred.

Answers - A) Sensitivity to parameter decreases in a feedback system.

Answers - C) If overshoot is excessive, the damping ratio is less than 0.4

Answers - B) The term “ controller” includes error detector and control elements.

Answers - D) The automated control system called where output is variable is known as Process control system.

Answers - B) Load gauge is used to obtain output position in a position control system.

Answer -
A) Damping ratio is given by -  tan x * sqrt(cos x) / 2

                                          = tan 45 * sqrt(cos 45) / 2

                                          = 0.42.

Answer - C) Eigenvalues are defined as the sum of elements of principal diagonal elements.

Answers - C) Oscillator isn’t used in the automatic control system.

Answer - A) The bandwidth should be medium for a good control system.

Answer - D) Slow response isn’t a feature of a good control system. A good control system is a negative feedback closed-loop control system.

Answer - A) The effect of feedback on sensitivity is minimum in an open-loop control system.

Answer - C) Sampling is necessary for the system where high accuracy in required

Answer - B). The system that works under unknown random actions is known as a Stochastic control system.

Answer - A) Output of control is given to the final control element.

Answer - B) False. A feedback control system is a low pass filter.

Answer - D) Peak overshoot and damping ratio measures speed of response.

Answer - B) There are two types of control systems - open-loop control system and close loop control system.

Answer - D) All the above are disadvantages of closed-loop control systems.

Answer - D) A closed-loop control system is accurate and less affected by noise.

Answer - B). The system called where output is varying with time is called a time-variant system.

Answer - A). The transfer function of positive feedback is given by T = G / (1 - GH)

Answer - B) Node is a point representing a variable or signal.

Answer - B). There are two types of time-domain analysis - Transient response, Steady-state response

Answer - C). A mixed node is a node having both incoming and outgoing branches.

Answer - D) All of the above are features of a test signal.

Answer - B) There are three types of static error constant -.position constant, the velocity constant, and the acceleration constant.

Answer - C) State-space method applies to both non-linear and time-variant systems.