Again, there would be one less equation than the number of variables (mesh currents) and hence a constraint equation is needed. Answer: This theorem states that, any number of current sources in parallel may be replaced by a single current source, whose current is the algebraic sum of individual source currents and source resistance is the parallel combination of individual source resistance. Inductor (L) Energy is stored in a magnetic field. A single family dwelling with 2400 square feet of living area has a 120/240 volt three-wire electrical service and contains the following:. Magnetic flux in a uniform closed magnetic circuit, length L meters and cross section A square meters is =1.26NItA × 10-6/ L weber. It is very useful when it is desired to determine the current through or voltage across any one element in a network instead of going through the lengthy method of soling the network. Browse from thousands of Electrical questions and answers (Q&A). There are many ways to go into technical based question but that depends on what sort of industry or work field you are going to work. What is the method to solve circuit using Source Transformation? An inductor is a passive electrical device employed in electrical circuits for its property of inductance. It states that, “The algebraic sum of currents at any node of a circuit is zero”. Where, Q is the symbol of charge measured in Coulombs (C), I is the current in amperes (A) and t is the time in seconds (s). RN is the resistance across the load terminals with all sources replaced by their internal resistances. or, Q = It By plotting the amplitude and phase versus the logarithm of frequency, each unit of change on the ? Non-Ideal or Practical Voltage Source For a practical source, the terminal voltage falls off with an increase in load current. Electrical Circuits Interview Questions and Answers. CLICK HERE —-> EEE INTERVIEW QUESTIONS. 7996. It is widely used in electric circuits in the form of a filter. Best Electrical Circuits Interview Questions and Answers. What does the term Power Factor shows? Answer: Mutual-inductance is the property of two coil because of which each opposes any change in the current flowing through the other by developing an induced emf. Capacitors are widely used as parts of electrical circuits in many common electrical devices. Explain.? 42. Explain the usefulness of Thevenin’s theorem in linear network? What do you mean by dependent and independent voltage sources? Q.12. During signal conversion, amount of information is lost. axis is equal to a factor of 10 also called a decade of frequency. This equation is the foundation on which Electrical Engineering is based. Answer: It states that for any given time, the sum and power delivered to each branch of any electric network is zero. In terms of energy, power is defined as “The time rate of change of energy is called power”. Answer: The study of resonance is very useful in the area of communication particularly. An ammeter measures current and a voltmeter measures a potential difference. Only one source should be present in the network. “Any two-terminal, linear circuit, of resistors and sources, can be replaced by a single current source in parallel with a resistor.”. Answer: The time rate of flow of electric charge across a cross-sectional boundary is termed as current. It states that, “The algebraic sum of voltages in any closed path of network that is traversed in any single direction is zero”. In contrast, Norton’s equivalent circuit is a practical current source. Answer: This theorem states that a linear, bilateral network consisting of active and passive elements can be replaced by a voltage source connected in series with impedance. Circuit Breaker is a mechanical device designed to close or open contact members, thus closing or opening an electrical circuit under the normal or abnormal conditions. Mathematically, Introduction to Electrical Engineering Interview Questions and Answers. ELECTRICAL ENGINEERING Interview Questions. RN = RTH, IN = VTH/RTH Could you measure Voltage in series? It is important to highlight that in AC circuits, the product of voltage and current yields the apparent power which is measured in volt-amperes or VA. KW which is also written ad Kilo-Watt is the real power that is actually converted to the useful work. This would be based on the magnitude of the ideal current source present between the two meshes and their mesh currents. 6. The quantity of total charge that passes through an arbitrary cross-section of a conducting material per unit second is defined as an Ampere. Question5: State sampling theorem. 46. What id difference between power and energy? Answer: It is based on conservation of energy. 22. ElectronicsPost.com is a participant in the Amazon Services LLC Associates Program, and we get a commission on purchases made through our links. (t = 0 for a single layer coil). What is Current Divider Rule (CDR)? Question4: Define Insulator? What is the difference between Voltages or Potential Difference? equivalent to a short circuit. SHARE. Answer: The current through an inductor cannot change instantaneously. Basic electrical questions (with answers) generally asked in interviews. 48. Any load resistance, RL will have the same voltage across, and current through it when connected across the terminals of either source. State clearly the Thevenin’s theorem. In the context of electric circuits, energy (w) is related to power by the following relationship p = vi =dw/dt So the difference is that power is the rate of change of energy. Answer: This theorem states that the voltage across or current through any element due to multiple sources present in a linear network is equal to the algebraic sum of voltage across or current through that element due to individual source with all other sources replaced by their internal impedances. Filters form a vital part in electrical networks especially where a particular frequency range is of prime concern. 34. It is used to measure the variation in terminal voltage between no load (IL =0, open circuit) and full load (IL = IFL). Only one source should be present in the network. State and define Norton’s Theorem? Question3: Different types of communications? What should be the internal resistance of an ideal voltmeter and ammeter? For the initial instant, the inductor may be considered as a current source of current IO. The circuit breaker is an electrically operated switch, which is capable of safely making, as well as breaking, short-circuit currents. Some materials have low resistance and are conductors; others are insulators. State and define Ohm’s Law? Answer: A network in which physically separate resistors, capacitors and inductors can be represented. Your email address will not be published. The usual way is to plot the amplitude in dB and phase in degrees or radians versus the logarithm of frequency. What is Force on a conductor in a magnetic field? Answer: Superposition theorem is very useful in linear network analysis because a complex network can be solved easily by breaking it in simpler networks and using superposition theorem. Under normal conditions the moving contact comes in contact with fixed contact thereby forming the closed contact for the flow of current. Elaborate Thevenin’s Theorem? The forms of practical capacitors vary widely, but all contain at least two electrical conductors (plates) separated by a dielectric (i.e. mmf A coil of N turns carrying a current I amps gives an mmf of NI ampere turns In a vacuum, a magnetizing force of 1 ampere turn / metre produces a magnetic field of 1.26 × 10-6 tesla. Superposition theorem can be formally stated as follows: Define Super node? Let us move to the next Digital Electronics Interview Questions. ? 250+ Electronics Interview Questions and Answers, Question1: What is Electronic? insulator). 39. Define Ohm’s Law for A.C (Alternating Current)? The cooling water circuit consists of a pump, condenser and cooling tower. 7. It takes energy from a battery or some other power source to move electrons to one of the plates and away from the other. When the main current in the coil increases, the induced current opposes the growth of current in the coil. If you are one of those selected for the job interview and are now looking forward to making an exciting and rewarding career in electrical … 43. Phasors simplify this analysis by considering only the amplitude and phase components of the sine wave. Differentiate between Kirchhoff’s First law and Kirchhoff’s Second law? Q.15. 24. 25. Define Ampere? RTH is the resistance across the load terminals with all sources replaced by their internal resistances. For example, the ability of a radio receiver to select a certain frequency transmitted by a station and to eliminate frequencies from other stations is based on the principle of resonance. For a capacitive type load I leads V, hence Leading power factor The algebraic sum of all the currents entering or leaving a node in an electric circuit is equal to zero. The sum of the voltages round any circuit = net “IR” drop in the circuit, 5. Voltage divider rule provides a useful formula to determine the voltage across any resistor when two or more resistors are connected in series with a voltage source. Dear Readers, Welcome to Electrical Circuits Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Electrical Circuits.These Electrical Circuits Questions are very important for campus placement test and job interviews. 3.5 kW 240 volt electric water heater,; 12 kW electric range,; 1.5 horsepower 240 volt central air conditioner,; 1/2 horsepower 120 volt garbage disposal,; 1/3 horsepower 120 volt furnace blower motor, a 1.2 kW 120 volt dishwasher, and 13. VTH is the open circuit (OC) voltage across the load terminals. The Ideal Current Source By definition, an ideal current source that produces a current which is independent of the variations in load. Q.11. Electrical Energy in Capacitor stores in Potential Charge form. What is Kirchoff’s Current Law (KCL)? 36. An inductor can take many forms. Copyright 2020 , Engineering Interview Questions.com, ELECTRICAL CIRCUITS Interview Questions :-. Superposition theorem is extremely useful for analyzing electric circuits that contains two or more active sources. Q4.Why most interrupts active Low? F = B I L Newtons, where B in tesla, I in amps and L in meters. Formally, the Thevenin’s theorem can be stated as: 47. When the main current in the coil decreases, induced current developed in the neighboring coil opposes the decay of current in the coil. Differentiate between Induced emf and Self inductance? In practice, power factor is used to specify the characteristics of a load. Electric Circuits Interview Questions and Answers This set of Electric Circuits Interview Questions and Answers focuses on " The International System of Units, Voltage and Current, Power and Energy " Resistor (R) Describe when to use an 'if' statement and an 'else' statement. In other words, the summation of instantaneous power or summation of complex power of sinusoidal sources in a electrical network is zero. An independent source produces its own voltage and current through some chemical reaction and does not depend on any other voltage or current variable in the circuit. Question #5. The total current leaving a point on an electrical circuit = total current entering State Kirchhoff’s voltage law (KVL). In other words, for an ideal voltage source, the supply current alters with changes in load but the terminal voltage, VL always remains constant. Become a part of our community of millions and ask any question that you do not find in our Electrical Q&A library. 2. No field excitation; Excessive load; Excessive load inertia; Do stepper motors have internal or external fans? The energy stored in a magnetic field is equal to the work needed to produce a current through the inductor. 20. Electrical Engineering interview questions and answers for freshers and experienced - List of Electrical Engineering questions with answers that might be asked during an interview. What is the energy stored in the magnetic field of the inductor? V = RI or I =V/R Also, there may be a wide distribution in the amplitude response over a specified range of frequencies. Due to the sudden change of supply the chock will generate around 1000 volts . What is DC Current source? ... All that matters is that the wire can handle the ampacity of the circuit breaker. Like capacitors, they are employed as filters as well but the most well known application is their use in AC transformers or power supplies that converts AC voltage levels. What does Bode Plots shows? Current can be defined as the motion of charge through a conducting material. Thus inductor acts as open circuit for the new applied source at the instant of switching. But with an initial charge in the system, the capacitor is equivalent to a voltage source of vale VO= qo/c, where qo the initial charge. Current Electricity 2. The instantaneous power delivered to circuit elements is the product of the instantaneous value of voltage and current of the element. Basic Electrical interview Questions & Answers paper-1 1.What is electricity ? Answer: Ideally the internal resistance of a voltmeter should be infinite and ideally the internal resistance of an ammeter should be zero. What are linear ICs? A capacitor (originally known as a condenser) is a passive two-terminal electrical component used to store energy electrostatically in an electric field. How many Types of Circuit Loads are there in a Common Electrical Circuit? Basically, it uses a conductor that is wound into a coil, and when electricity flows into the coil from the left to the right, this will generate a magnetic field in the clockwise direction. 1. The output of a dependent source, on the other hand, is subject to a certain parameter (voltage or current) change in a circuit element. In other words, it can be said that the load resistance must match the Thevenin’s resistance for maximum power transfer to take place i.e., (Rs = RTH) = RL in mesh analysis) or vice versa. Whereas Self Inductance E = – L dI/dt, where E is in volts, L is inductance in henneries and dI/dt is in amps/sec. Q.13. It has two contacts namely fixed contact & moving contact. 2. Q.16. Circuit Breaker Interview Questions & Answers What is a Circuit Breaker? It operates over a continuous range of input levels. Q.18. Hence on connecting an uncharged capacitor to an energy source, a current flows instantaneously. Dependent (Voltage and Current) Sources Electric circuits can be series or parallel. Bode plots are graphical ways to display the behavior of a circuit over a wide range of frequencies. At what factor Resistance R of a conductor depends? Moreover, they can be solved using complex algebra or treated vectorially using a vector diagram. Open circuit in one phase or short circuit; Field connection may be excessive. Statement. Current divider rule provides a useful relationship for determining the current through individual circuit elements that are connected in parallel. When this occurs, the voltage across the load resistance will be Vs/2 and the power delivered to the load is given by which clearly demonstrates maximum power delivered when Rs = RL. Congratulation! What does the term “Voltage Regulation” means? State Tellegen’s theorem and its application. What do you mean by electric network and electric circuit? An inductor is a piece of conducting wire generally wrapped around a core of a ferromagnetic material. Explain the usefulness of superposition theorem in linear network? Answer: A network in which resistors, capacitors and inductors cannot be electrically separable and isolated as individual elements. 38. Q.19. Independent (Voltage and Current) Sources The Ideal Voltage Source An ideal voltage source which has a terminal voltage which is independent of the variations in load. What is an inductor and what does it do? What is the difference between an inductor and a capacitor? R, L, C) or branches. An inductor is a passive electronic component which is capable of storing electrical energy in the form of magnetic energy. 21. In general, there are two main types of DC sources Twitter. A constraint equation can be easily specified given by the magnitude of the ideal voltage source present between the nodes and the respective node voltages. Initial condition must be zero. 37. It can also be subdivided into ideal and non-ideal categories. For a purely resistive load f = 0 Degree, hence Unity Power Factor V ? A transmission line has distributed resistor, inductor and capacitor which are not isolated from the network. Question5: State sampling theorem. This is made possible using source transformations. Note that the symbol and the unit of voltage are both denoted by the same letter; However, it rarely causes any confusion. Differentiate between Real and Apparent Power? An ideal filter will attenuate all signals with frequencies less than and greater than 100 MHz thus providing the best channel sound quality without any distortion. Differentiate between ideal and non-ideal current sources 10. 28. 29. Norton parameters. 35. Answer: A unilateral network is one whose elements follow different laws relating to voltage and current for different direction of voltage and current polarities. What is Maximum Power Transfer Theorem? However, it is useful in deriving equivalent circuit models of semiconductor devices such as a transistor. Question3: Define Conductor? Explain. 0 will draw an excessively large amount of current and a power factor correction is required. A circuit element is linear if the relation between voltage and current involves a constant coefficient. An ideal voltage source has zero internal resistance. ELECTRICAL CIRCUITS Interview Questions :-1. 19. What is Superposition Theorem? Q.24. A capacitor is an electrical/electronic device that can store energy in the electric field between a pair of conductors (called “plates”). 900 and cos f ? 17. Your email address will not be published. Explain the switching action of an inductor? Check out this well-curated list of frequently asked Electrical interview questions and answers. 14. A network is not necessarily a circuit example T network. Categories Interview Questions, Basic Electrical, Battery, Electric Vehicles, Electrical Machines, Electronics, Substation, Transformer Nervous about an upcoming Electrical Engineer interview? A circuit load can also be referred to as a sink since it dissipates energy whereas the voltage or current supply can be termed as a source. It is particularly advantageous where a single resistor or load in a circuit is subject to change. Mutual induction is the characteristic of a pair of coils. What does the term Super-mesh means? A capacitor is a passive circuit element that has the capacity to store charge in an electric field. 3. I For an inductive type load I lags V, hence Lagging power factor Briefly explain the purpose of Inductor in an electric circuit? The energy stored in a capacitor is almost entirely in the electric field produced between the plates. ... Period time is the electrical energy used by the logic circuits… Before the signal is transmitted, it is converted into digital form. Answer: A generator which maintains its output current independent of the voltage across its terminals. Everything else would remain same only the resistance will be replaced with Impedance, which is defined as the opposition to the flow of A.C. 18. State exams cover such areas as Electrical Theory, Trade Knowledge, Grounding and Bonding, Wiring Methods and Installation, Overcurrent Protection, Load Calculations, etc. Clearly RN = RTH. 44. Instead, a capacitor stores energy in the form of an electrostatic field between its plates. FREE Download 100 Electrical Interview Questions and Answers book. What is Voltage Divider Rule? A bilateral network is defined as those whose elements can transmit well in either direction. An electric circuit is a closed energized network. Voltage regulation (VR) is an important measure of the quality of a source. What is Corkscrew Rule? KVAR is also termed as Kilo-Volt Reactive this power is used for magnetic field excitation and flows back and forth between source and load. What does Ampere turns shows? IN, RN =? Whereas Magnetic flux f = B A where ø is in weber, B is in tesla and A is in square meters. Basic Electronics Questions for Interview Electronics Engineering students need to face some Basic Electronics Questions whether they are preparing for an interview or viva voce. Required fields are marked *. An example could be the sum of voltages across a series connection of a resistor and an inductor. However, this would mean one less equation than the number of variables (node voltages) present in the circuit. For example, an iron core conductor is bilateral but it is non linear. This MCQ Test/Quiz is for the student who is preparing for the Electrical Engineering Gate exam, Job Interviews, Competitive Exams, and … Powerbuilder Interview Questions ; Question 18. Answer: A linear integrated circuit is a solid state analog device characterized by a theoretically infinite number of possible operating states. 250+ Electronic Circuits Interview Questions and Answers, Question1: What is Electronic? The formula for the energy stored in a magnetic field is E = ½ LI 2. I =Q/t For example, elements made of high conductivity material like iron core conductor is bilateral elements. Why Inductors are installed in electrical Circuits? In such a situation, like super-node, mesh equations are written for the meshes involved and added giving a single equation. The usual way to solve this is to write KCL equations for both nodes and simply add them together into one equation ignoring the voltage source in question. 40. Thevenin’s equivalent circuit is a practical voltage source. 12. The circuit breaker does not require a replacement like the fuse which needs to be replaced. In an electric circuit, it is often convenient to have a voltage source rather than a current source (e.g.