MCQs : Control System Engineering(4)

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  1. The condition under which the error signal of a feedback control system would not be the difference between the input and the output is
    • when both the input and output transducers have unity gain
    • when the input and output transducers have non-unity gain
    • when the input or output transducers have non- unity gain
    • when the input and/or the output transducers have non- unity gain


  1. If the error signal is not the difference between input and output, then error signal is called
    • The actuating signal.
    • The reference signal.
    • The controlled variable.
    • The disturbance.
  2. The advantage(s) of having a computer in the loop:
    • Multiple sub systems can be controlled by the same computer through time sharing.
    • Any adjustments to the controller can be implemented with simply software changes.
    • Supervisory functions, such as scheduling many required-applications, can be performed.
    • All of the above
  3. The three major design criteria for control systems are.
    • Stability, Sensitivity, and Steady-state error.
    • Stability, Transient response, and Steady-state error
    • Stability, Sensitivity, and Transient response.
    • Sensitivity, Transient response, and Steady-state error.
  4. Name the two parts of a system’s response.
    • Natural , Transient
    • Steady-state, Zero-state
    • Transient, Steady-state
    • Forced, Zero-input
  5. Physically, the unstable system will
    • destroy itself
    • reach an equilibrium state because of saturation in driving amplifiers
    • hit limit stops
    • Either of above outcomes a, b, c.
  6. Instability is attributable to _______part of the total response.
    • Transient response
    • Steady state response
    • Both a and b
    • Either b or a.
  7. ________ is attributable to steady state part of the total response.
    • Stability
    • Accuracy
    • Both a and b
    • None
  1. Adjustments of the forward path gain can cause changes in the transient response.
    • the statement is TRUE
    • the statement is FALSE
    • the statement is only TRUE if feedback is unity
    • none
  2. A control system is said to be robust when

           (i)     It has low sensitivities

           (ii)   It is stable over a wide range of parameter variations

            (iii) The performance stays within prescribed (but practical) limit bounds in presence of changes in the parameters of the                      controlled system and disturbance input.

    • Only (i)
    • Only (ii)
    • Only (iii)
    • Only (i),(ii),(iii)

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