DSC EXAM QUESTIONS WITH CORRECT
ANSWERS 2026
Definition of PID control, how does it work - CORRECT ANSWER -a widely used feedback control
mechanism that automatically adjusts a system's output to maintain a desired setpoint by
calculating the difference between the current state and the setpoint, then applying corrective
actions based on three components: proportional (P), integral (I), and derivative (D)
What does the proportional gain respond to - CORRECT ANSWER -This component directly
reacts to the current error by applying a corrective action proportional to the error magnitude,
providing immediate response to deviations from the setpoint.
What does the integral gain respond to - CORRECT ANSWER -This component accumulates the
error over time, addressing any persistent deviations from the setpoint and helping to eliminate
steady-state errors.
What does the derivative gain respond to - CORRECT ANSWER -This component predicts future
error based on the rate of change of the error, helping to prevent overshoot and improve
system stability by quickly adjusting the control action as the system approaches the setpoint.
How to design a PID control for a first order and second order system - CORRECT ANSWER -first
accurately model the system's transfer function, then select appropriate proportional (Kp),
integral (Ki), and derivative (Kd).
TF for a first order system - CORRECT ANSWER -G(s) = K/(τs + 1), where K is the gain and τ is the
time constant
TF for a second order system - CORRECT ANSWER -Represented by G(s) = K/(s^2 + 2ζωns +
ωn^2), where K is the gain, ζ is the damping ratio, and ωn is the natural frequency.
ANSWERS 2026
Definition of PID control, how does it work - CORRECT ANSWER -a widely used feedback control
mechanism that automatically adjusts a system's output to maintain a desired setpoint by
calculating the difference between the current state and the setpoint, then applying corrective
actions based on three components: proportional (P), integral (I), and derivative (D)
What does the proportional gain respond to - CORRECT ANSWER -This component directly
reacts to the current error by applying a corrective action proportional to the error magnitude,
providing immediate response to deviations from the setpoint.
What does the integral gain respond to - CORRECT ANSWER -This component accumulates the
error over time, addressing any persistent deviations from the setpoint and helping to eliminate
steady-state errors.
What does the derivative gain respond to - CORRECT ANSWER -This component predicts future
error based on the rate of change of the error, helping to prevent overshoot and improve
system stability by quickly adjusting the control action as the system approaches the setpoint.
How to design a PID control for a first order and second order system - CORRECT ANSWER -first
accurately model the system's transfer function, then select appropriate proportional (Kp),
integral (Ki), and derivative (Kd).
TF for a first order system - CORRECT ANSWER -G(s) = K/(τs + 1), where K is the gain and τ is the
time constant
TF for a second order system - CORRECT ANSWER -Represented by G(s) = K/(s^2 + 2ζωns +
ωn^2), where K is the gain, ζ is the damping ratio, and ωn is the natural frequency.
