Electrical Interview Questions With Answers:
Electrical Question: What are the Characteristics of Negative Feedback?
Answer:
Negative Feedback in a Control System has following Characteristics
Reduction in the gain at the expense of better stability of the system
Rejection of disturbance signals in the system
Low Sensitivity to parameter variations
Accuracy in tracking the steady state value
Electrical Question: What are the basic components of the feedback control system?
Answer: Basic components of the feedback control system are process system (open loop system), feedback path element, error detector, and controller.
Electrical Question: Define Transfer Function?
Answer: Transfer Function of a control system is defined as:
i) Ratio of Laplace transform of Output to the Laplace transform of the Input with zero initial conditions
ii) Transfer function is defined as the Laplace transform of Impulse response of the system with zero initial conditions
Electrical Question: What is Time Invariant system?
Answer: Time Invariant System is one in which the input and output characteristics of the system does not change with time.
Electrical Question: What is the basic rule for Block Diagram Reduction Technique?
Answer: The rules of the Block Diagram reduction Techniques are designed in such a manner that any modifications made in the diagram will not alter the input and output relation of the system
Electrical Question: Where Servomechanism is used?
Answer: Servomechanism is used in control system where the output is pertained to vary the mechanical position of a device.
Servo Mechanism is widely used in Governor value position control mechanism used in the power plants where speed of the turbine is taken and processed using the transducers and final control element is brought as mechanical movement of the value. Now a days Governor value control is done with Electronic controls using power Thyristors. Servomechanism is also widely used in the robotic hand movements.
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