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System Engineer Interview Questions
A list of top frequently asked Control System interview questions and answers are given below. When the number of elements connected performs a specific function then the group of elements is said to constitute a system or interconnection of various components for a specific task is called system.
Example: Automobile. Any set of mechanical or electronic devices that manages, regulates or commands the behavior of the system using control loop is called the Control System. It can range from a small controlling device to a large industrial controlling device which is used for controlling processes or machines. Open loop control System: An open-loop control system is a system in which the control action is independent of the desired output signal.
Examples: Automatic washing machine, Immersion rod. Closed loop control System: A closed-loop control system is a system in which control action is dependent on the desired output. Examples: Automatic electric iron, Servo voltage stabilizer, an air conditioner. The time required to change from one state to another state is known as transient time , the value of current and voltage during this period is called transient response and the system in which the input and output characteristics of the system does not change with time is called the Time-Invariant System.
Linear system: Linear systems are the systems which possess the property of homogeneity and superposition. The term superposition means that an input r 1 t gives an output c 1 t and r 2 t will give the output c 2 t. If we apply both the input r 1 t and r 2 t together, then the output will be the sum of c 1 t and c 2 t.
Non-Linear System: Non-linear systems are the systems which do not possess the property of superposition and homogeneity, and the output of these systems are not directly proportional to its input.
In these types of systems, the stability of the system depends upon the input and initial state of the system. When the two differential equations are of same order or form such type of systems is called analogous systems.
Transfer function of a system is defined as the ratio of Laplace transform of output to the Laplace transform of input with all the initial conditions as zero. The processing system open loop system , feedback path element, an error detector, and controller are the necessary components of the feedback control system.
When the input is fed to the system and the output received is sampled, and the proportional signal is then fed back to the input for automatic correction of the error for further processing to get the desired output is called as feedback in control system.
Gain margin is the gain which varies before the system becomes stable because if we continuously increase the gain up to a certain threshold, the system will become marginally stable, and if the gain varies further then it leads to instability. The graphical representation of the system's relationship between the variables of a set of linear equations is called SFG Signal Flow Graph. Signal flow graphs do not require any reduction technique or process. The input and output variable relationship of a signal flow graph is given by Mason's Gain Formula.
The basic rule for block diagram reduction is that if we make any changes in the diagram, then that changes do not create any changes in the input-output relationship of the system. Order of the system is the highest derivative of the order of its equation. Similarly, it is the highest power of 's' in the denominator of the transfer function.
The maximum value of the closed-loop transfer function is called the Resonant Peak. A large value of resonant peak means that it has large overshoot value in the transient response. The slope of the log-magnitude curve near the cut-off frequency is called the cut-off rate. It indicates the ability of the system to differentiate between the signal and the noise.
When the phase of the open loop transfer function reaches ? When we have to bring the system to the edge of instability, the additional phase lag required at the gain crossover frequency is called the Phase Margin.
The value at which the function F s becomes infinite is called the Pole of the function F s , where F s is a function of complex variables. The value at which the function F s becomes zero is called the Zero of the function F s , where F s is a function of complex variables. When there is an emergency, i. Positive feedback increases the error signal and drives the system to the instability that is why it is not generally used in the control system.
Positive feedbacks are used in minor loop control systems to amplify internal signals and parameters. When a specific type of motor known as servomotor is combined with a rotary encoder or a potentiometer, to form a Servomechanism. In this setup, a potentiometer provides an analog signal to indicate the position and an encoder provide position and speed feedback.
Servomechanism is used in the control system so that the mechanical position of a device can be varied with the help of output. The Servomechanism is widely used in a Governor value position control mechanism that is used in power plants to take the speed of turbine and process it using the transducer, and the final value is taken as a mechanical movement of the value.
However, nowadays Governor value position control is done with Electronic controls that use power Thyristors. This mechanism is also used in robotic hand movement.
The media or way through which we lay the field cables in plants is called as cable tray. These are made of aluminum, steel or fiber reinforced plastic FRP and are available in six types-. The main points which we have to consider before laying the cables are the site conditions and the adequate space where we have to lay the cable. Based on the occupancy in the cable tray and a number of cables required we have to choose the size of the cable tray.
These are available in all sizes like 80,, , , and The slope near the cut-off frequency of the log-magnitude curve is called the cut-off rate. The cut-off rate indicates the ability of the system to distinguish between the signal and the noise. It is used in large systems using telemetry links based on pulse modulation PM translational data.
Stable systems are the system in which all the roots of the characteristic equations lie on the right half of the 'S' plane. Marginally stable systems are the system in which all the roots of the characteristic equations lie on the imaginary axis of the 'S' plane. Unstable systems are the system in which all the roots of the characteristic equations lie on the left half of the 'S' plane.
Routh Hurwitz criterion states that a system is stable if and only if all the roots of the first column have the same sign and if all the signs are not same then number of time the sign changes in the first column is equal to the number of roots of the characteristic equation in the right half of the s-plane.
Automatic Controllers are the device which compares the actual value of plant output with the desired value. These systems produce the control system that reduces the deviation to? JavaTpoint offers too many high quality services.
Mail us on hr javatpoint. Please mail your requirement at hr javatpoint. Duration: 1 week to 2 week. All Interview. Control System Interview Questions A list of top frequently asked Control System interview questions and answers are given below. There are two types of Control System- Open loop control system. Closed loop control system. Javatpoint Services JavaTpoint offers too many high quality services.
Advantages of the open-loop control system Open loop systems are simple. These are economical. Less maintenance is required and is not difficult. Disadvantages of the open-loop control system Open loop systems are inaccurate.
These systems are not reliable. These are slow. Optimization is not possible. Advantages of closed-loop systems The closed loop systems are more reliable.
Closed loop systems are faster. Many variables can be handled simultaneously. Optimization is possible. Disadvantages of closed-loop systems Closed loop systems are expensive. Maintenance is difficult. Installation is difficult for these systems. The essential characteristics of the signal flow graph are: It represents a network in which nodes are used for the representation of system variable which is connected by direct branches.
SFG is a diagram which represents a set of equations. It consists of nodes and branches such that each branch of SFG having an arrow which represents the flow of the signal. It is only applicable to the linear system. Depending upon the condition of hazards the type of cable is decided.
The temperature elements are- Thermocouple. Resistance temperature detectors RTDs. Sampled data system has the following applications- Quantized data is used for controlling in High-speed tinplate rolling mills. Digitally controlled or pulse controlled electric drives. For machine tool operations which are numerically controlled.
Marginally stable systems are the system in which all the roots of the characteristic equations lie on the imaginary axis of the 'S' plane 38 What are unstable systems?
Control action is the manner in which the automatic controller produces the control signal. Java Basics Interview Questions.
Top 20 Systems Engineer Interview Questions and Answers
A list of top frequently asked Control System interview questions and answers are given below. When the number of elements connected performs a specific function then the group of elements is said to constitute a system or interconnection of various components for a specific task is called system. Example: Automobile. Any set of mechanical or electronic devices that manages, regulates or commands the behavior of the system using control loop is called the Control System. It can range from a small controlling device to a large industrial controlling device which is used for controlling processes or machines. Open loop control System: An open-loop control system is a system in which the control action is independent of the desired output signal. Examples: Automatic washing machine, Immersion rod.
System Engineer interview questions
The employer would want to know that not only you can do the job but you can make the difference and bring significant contribution — Simple as that. This is your time to express why you think that your professional abilities fit into the job and its requirements. Is This Answer Correct? This question seems simple, so many people fail to prepare for it, but it's crucial.
MCSE Interview Questions and Answers will guide you that Microsoft Certified Systems Engineer MCSE refers to the broad certification program for Microsoft, although it can also refer to an individual candidate who had completed any one exam within the program subject to some exclusions. Mention what windows server service is used to install client operating system over the network? WDE Windows Deployment Services allows you to install client and server operating systems over the network to any computer with a PXE enabled network interface. Download PDF. You Might Like: Top 50 Desktop
Look through applicants for System engineer. System engineers typically improve and maintain information systems that perform key functions of this or that company. They are responsible for software design and development in order to provide the highest levels of system performance, safety, and availability. Perfect potential system engineers have abundant technical experience along with excellent troubleshooting abilities. In the course of your interview, ask questions that include scripts and automation software used in your company.
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Systems engineers generally work on the development of in-house IT infrastructure, which can range from reporting applications to internal networks and web servers. As a result, a systems engineer can be a technological jack-of-all-trades with a variety of past experiences. One candidate will have different strengths from the next. Questions like this will give you a better understanding of a candidate's expertise and how well their skill set will fit your organization's needs. What to look for in an answer:.
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