Control Systems (ECE Perspective) – Multiple Choice Questions (MCQs)

1. 73. The stability of a discrete-time control system is determined by the location of its poles relative to the:

   • A. Real axis
   • B. Imaginary axis
   • C. Unit circle
   • D. Origin

2. 74. The difference between the desired output and the feedback signal in a closed-loop system is calculated at the:

   • A. Controller
   • B. Actuator
   • C. Summing point
   • D. Sensor

3. 75. The sensitivity of a system to noise is generally reduced by:

   • A. Positive feedback
   • B. Negative feedback
   • C. Increasing gain
   • D. Decreasing gain

4. 76. The term "hunting" in synchronous machines is a phenomenon of:

   • A. Speed oscillation
   • B. Voltage fluctuation
   • C. Current surge
   • D. Power factor variation

5. 77. A typical application of control systems in electronics is:

   • A. Power amplification
   • B. Signal filtering
   • C. Automated temperature control
   • D. Data storage

6. 78. The characteristic of a control system that measures its ability to follow varying inputs with minimum error is:

   • A. Stability
   • B. Accuracy
   • C. Bandwidth
   • D. Sensitivity

7. 79. The use of operational amplifiers (Op-Amps) in control systems is common for implementing:

   • A. Mechanical components
   • B. Hydraulic components
   • C. Electronic controllers
   • D. Pneumatic components

8. 80. An analog-to-digital converter (ADC) in a control system acts as an interface between the:

   • A. Digital controller and analog plant
   • B. Analog sensor and digital controller
   • C. Analog input and analog output
   • D. Digital input and digital output

9. 81. A digital-to-analog converter (DAC) in a control system acts as an interface between the:

   • A. Digital controller and analog plant
   • B. Analog sensor and digital controller
   • C. Analog input and analog output
   • D. Digital input and digital output

10. 82. The maximum number of roots that can lie on the imaginary axis for a stable linear system (excluding the origin) is:

    • A. One
    • B. Two
    • C. Three
    • D. Any number

11. 83. The stability of a control system can be graphically analyzed using the:

    • A. Routh-Hurwitz array
    • B. Nyquist criterion
    • C. Root locus
    • D. All of the above