Interview Questions.

Q1. What Are Different Types Of Control Systems?

Two main varieties of Control Systems are 

Open loop Control Systems: The Open loop Control System is one in which the Output Quantity has no impact on the Input Quantity. No comments is present from the output quantity to the enter quantity for correction.

Closed Loop Control System: The Closed loop Control System is one in which the remarks is provided from the Output quantity to the enter quantity for the correction so that you can preserve the preferred output of the system.

Q2. What Are Test Signals And Their Significance?

The understanding of the input signal is required to expect the response of the system. In maximum of the systems input indicators are not recognized ahead of the time and it is also tough to specific the input indicators mathematically by way of easy equations. In such instances figuring out the performance of the machine isn't viable.Test alerts allows in predicting the overall performance of the machine because the input alerts which we supply are acknowledged as a result we will see the output reaction of the system for a given input and may understand the conduct of the manage device. The usually used take a look at signals are impulse, ramp, step indicators and sinusoidal signals.

Q3. What Are The Basic Components Of The Feedback Control System?

Basic components of the remarks manage gadget are system device (open loop gadget), feedback direction detail, blunders detector, and controller.

Q4. What Is The Use For Cable Entry In Control Room?

In the technique plant Control room built considering the non-risky vicinity. So in case if fire/Explosion takes place within the plant than that must be restricted from coming into Into the control room. So MCT(Multiple cable trient) blocks are used. 

Q5. What Is Resonant Peak?

Resonant height is defined because the most value of the closed loop trfer characteristic.A big resonant peak corresponds to huge overshoot within the trient respose

Q6. What Is Zero Of The System?

Zero of a characteristic F(s) is a price at which the feature F(s) becomes zero, wherein F(s) is a function of complicated variables.

Q7. What Is Cut-off Rate?

The slope of the log-significance curve close to the reduce-off frequency is called the cut-off price. The reduce-off charge indicates the ability of the machine to differentiate between the sign and the noise.

Q8. What Is A Feedback In Control System?

The Feedback in Control System in one in which the output is sampled and proportional signal is fed returned to the input for computerized correction of the error ( any change in desired output) for futher processing to get returned the favored output.

Q9. Why Negative Feedback Is Preferred In The Control System?

The position of Feedback in control gadget is to take the sampled output returned to the input and examine output signal with input signal for error ( deviation from the desired end result). 

Negative Feedback effects within the better stability of the system and rejects any disturbance indicators and is less touchy to the parameter versions. Hence on top of things structures negative comments is taken into consideration.

Q10. Explain Mechanical Trlational System?

Model of mechanical trlational system may be received by using the use of 3 fundamental factors Mass, Spring and Dash-pot.

Weight the mechanical system is represented through mass and is believed to be concentrated at the middle of frame.

The elastic deformation of the frame may be represented by the spring

Friction present in a mechanical gadget may be represented by way of dash-pot.

Q11. What Is The Effect Of Positive Feedback On Stability Of The System?

Positive feedback is not used usually in the manipulate machine as it will increase the mistake signal and drives the system to instability. But high quality feedbacks are utilized in minor loop manage structures to make bigger certain internal alerts and parameters.

Q12. What Is The Basic Rule For Block Diagram Reduction Technique?

The guidelines of the Block Diagram reduction Techniques are designed in this kind of way that any modifications made inside the diagram will now not alter the input and output relation of the gadget.

Q13. What Are The Characteristics Of Negative Feedback?

Negative Feedback in a Control System has following Characteristics

Reduction in the gain at the cost of higher stability of the system

Rejection of disturbance signals within the gadget

Low Sensitivity to parameter versions

Accuracy in monitoring the steady country cost

Q14. What Is Control System?

In a System the output and inputs are interrelated in this sort of way that the output quantity or variable is controlled with the aid of input amount, then such a system is called Control System.

The output quantity is known as controlled variable or reaction and the enter amount is known as command signal or excitation.

Q15. What Is S-domain And Its Significance?

By taking Laplace trform for  differential equation within the time domain equations in S-area may be acquired.    LF(t)=F(s)

S domain is used for fixing the time domain differential equations without difficulty by using making use of the Laplace for the differential equations.

Q16. What Is Pole Of The System?

Pole of a characteristic F(s) is the value at which the feature F(s) turns into endless, in which F(s) is a function of the complex variable s.

Q17. How Time Response Of The System Is Divided?

Time reaction of the system consists of two components: 1.Trient kingdom response @Steady kingdom reaction. Trient response of the device explains about the reaction of the device whilst the enter modifications from one state to the other. Steady kingdom reaction of the machine indicates the response as the time t, strategies infinity.

Q18. Where Servomechanism Is Used?

Servomechanism is used on top of things gadget in which the output is pertained to vary the mechanical function of a tool.

Servo Mechanism is broadly utilized in Governor value position manipulate mechanism used inside the strength flora in which speed of the turbine is taken and processed using the trducers and  very last manipulate element is delivered as mechanical movement of the value. Now a days Governor cost manipulate is done with Electronic controls the use of strength Thyristors. Servomechanism is likewise extensively used in the robotic hand actions.

Q19. What Is Time Response Of The Control System?

Time reaction of the manage gadget is defined because the output of the closed loop gadget as a function of time. Time response of the machine can be received by fixing the differential equations governing the device or time reaction of the gadget can also be obtained by means of trfer characteristic of the gadget.

Q20. What Is Gain Margin?

The Gain Margin is described because the reciprocal of the importance of open loop trfer feature at phase go over frequency. The gain margin shows the amount by way of which the benefit of the device may be elevated without affecting the steadiness of the gadget

Q21. Phase Margin?

The phase margin is the amount of additional segment lag at the benefit pass over frequency required to bring the machine to the verge of instability.

Q22. What Is Resonant Frequency?

The frequency at which resonant height happens is known as the resonant frequency. Resonance frequency explains about the rate of the trient response.

Q23. Define Trfer Function?

Trfer Function of a manipulate system is defined as:

Ratio of Laplace trform of Output to the Laplace trform of the Input with zero preliminary situations

Trfer characteristic is described because the Laplace trform of Impulse reaction of the device with zero initial situations

Q24. What Is Phase Cross Over Frequency?

The frequency at which the section of the open loop trfer function is 180o  is referred to as the phase go over frequency.

Q25. What Is A System?

When some of factors or additives are related in a sequence to perform a particular characteristic, the group of elements that each one represent a System.

Q26. What Is Mathematical Model Of A Control System?

Control system is a collection of physical elements linked together to serve an goal. The output and input family members of numerous bodily device are governed by means of differential equations. Mathematical version of a control system constitutes set of differential equations. The response of the output of the machine may be studied with the aid of solving the differential equations for diverse input conditions.

Q27. What Is Order Of The System?

Order of the system is described as the order of the differential equation governing the system. Order of the device may be decided from the trfer feature of the system. Also the order of the system helps in knowledge the variety of poles of the trfer function. For nth order machine for a specific trfer characteristic carries 'n' number of poles.

Q28. What Is Time Invariant System?

Time Invariant System is one in which the input and output characteristics of the machine does not trade with time.

Q29. What Is Signal Flow Graph?

A Signal Flow Graph is a diagram that represents a set of simultaneous linear algebraic equations. By taking Laplace trform the time domain differential equations governing a control gadget may be trferred to a hard and fast of algebraic equations in s-area. The sign Flow graph of the machine may be built the usage of these equations.

Q30. What Are The Basic Properties Of Signal Flow Graph?

The basic residences of the signal float graph are:

Signal Flow Graphs are applicable to linear systems

It consists of nodes and branches. A node is a point representing a variable or signal. A department shows the useful dependence of one signal on every other

A node provides the indicators of all incoming branches and trmits this sum to all outgoing branches

Signals journey alongside branches handiest in a marked direction and is increased by way of the benefit of the branch

The algebraic equations ought to be in the shape of cause and impact relationship