Sir, Please send me Electrical Engineering Interview Questions. 90. On social networking if you are sharing stuff of this site or documents then you have to credit back to us with sharing our link. 37. How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil? How does Zener phenomenon differ from Avalanche breakdown? The Most Common Electrical Engineer Interview Questions ELECTRICAL Engineering Interview Resolution:It depends upon R=rho l/a where area(a) is inversely proportional to resistance (R), so if (a) increases, R decreases & if R is less the leakage current will take low resistance path so the earth pin should be thicker. why? 2.What are the types of electricity ? Required fields are marked *. Resolution:Knee point voltage is calculated for electrical Current transformers and is very important factor to choose a CT. The reason that 4ma is chosen instead of 0 mA is for fail safe operation .For example- a pressure instrument gives output 4mA to indicate 0 psi, up to 20 mA to indicate 100 psi, or full scale. Actually, this is a typical job … synchronous machines have capability to work on different power factor(or say different imaginary power varying the field emf. This allows the control power for multiple machines to be locked out by the turn of a single key switch. Circuit Breaker is one which makes or breaks the circuit.It has two contacts namely fixed contact & moving contact.under normal condition the moving contact comes in contact with fixed contact thereby forming the closed contact for the flow of current. Why ELCB can’t work if N input of ELCB do not connect to ground? 85. whenever any internal fault occurs in a transformer, the boucholz relay at once gives a horn for some time, if the transformer is isolated from the circuit then it stop its sound itself other wise it trips the circuit by its own tripping mechanism. Well into the 170s, polychlorinated biphenyls (PCB)s were often used as a dielectric fluid since they are not flammable. alternator, can be steam turbines,or hydro turbines .When poles of the rotor moves under the armature That type of contenders can find Electrical Engineering MCQ Quiz Questions and Answers on this portal. since the air in the CB is having vacuum pressure the arc formation is interrupted. The second law of thermodynamic depicts that the total entropy of an isolated system can never reduce over time. All base load power plants have a high load factor. Differential Amplifier: The amplifier, which is used to amplify the voltage difference between two input-lines neither of which is grounded, is called differential amplifier. Switch mode power converter can be used in the following 5 different ways. How can you relate power engineering with electrical engineering? 178. Low lagging power factor causes a large voltage drop, hence extra regulation equipment is required to keep voltage drop within prescribed limits. The armature flux may support main flux or opposes main flux. Why back emf used for a dc motor? Due to any problem in instrument (i.e) broken wire, its output reduces to 0 mA. 99. Engineering: Sub Category Is: Electrical Engineering Interview Questions: Total Questions: 104: Electrical Engineering Interview Guide Visited: 10416 Times Electrical Engineering Interview PDF Uploaded: 8/24/2012 Last PDF Updated: 04/09/2018 Electrical Engineering PDF Downloaded: 10125 Time(s) (1). Whereas CB gets activated under fault conditions according to the fault detected.Bus bar is nothing but a junction where the power is getting distributed for independent loads. Define the following terms:- Rotary phase converter will be converting single phase power into true balanced 3 phase power,so it is often called as single phase to three phase converter . What is slip in an induction motor? EG. 123. Its Single Phase induction motor which mostly squirrel cage rotor and are capacitor start capacitor run. It deals with generation, transmission and distribution of energy in electrical form. Explain different types of D.C motors? What is meant by insulation voltage in cables? What is the difference between earth resistance and earth electrode resistance? Electrical Engineer Job Interview Questions and Answers Question: Tell us about yourself. 143. Why should be the frequency 50 Hz 60Hz only why not others like 45, 95 56 or anything , why should we maintain the frequency constant if so why it is only 50 Hz 60Hz? 18 Project Manager Interview Questions & Answers. A generating stations is supposed to fed power to the grid and in case generating units are off,there is no generation in the plant then plant may take power from grid. Electrical Engineering Interview Questions and Answers pdf Book – Basic Electrical & Electronics Engineering Questions – Electrical Engineering is one of the most popular engineering branches in India. These wires are made of materials such as Constantan and Manganin because of their high resistivity, and low temperature coefficients. Why do you want to leave your current job? Aero turbine always keeps going at maximum efficiency point. I thing it’s good one 4 me thanks, Your email address will not be published. and is of sinusoidal in nature…due to polarity change of rotor poles(i,e) N-S-N-S. 69. 114. In order to stop it quickly we place a load(resitor) across the armature winding and the motor should have maintained continuous field supply. Electrical Engineering MCQ Quiz Answers There are a lot of the students are preparing for Electrical Engineering MCQ Quiz, but they don’t have an online platform for examining the preparation. 83. What is the power factor of an alternator at no load? I(L)*1.25=I(MAX) maximum current. 163. By providing damper winding: Here, bar conductors are embedded in the outer periphery of the rotor poles and are short-circuited with the short-circuiting rings at both sides. It is used in oil filled transformers, some types of high voltage capacitors, fluorescent lamp ballasts, and some types of high voltage switches and circuit breakers. Review a list of frequently asked Electrical interview questions for electrical graduates. Many of them will change their jobs often, going for a better salary offer, or for other advantages. Due to the sudden change of supply the chock will generate around 1000 volts . Ans : There are two types,(1) static Electricity and (2) Current Electricity. highlight its significance. State Maximum power transfer theorem Difference between a four point starter and three point starter? Why, when birds sit on transmission lines or current wires doesn’t get shock? otherwise it’s not possible to ionize the particles in tube. Resolution:In DC motors, Voltage equation is V=Eb-IaRa (V = Terminal voltage,Eb = Back emf in Motor,Ia = Armature current,Ra = Aramture resistance).At starting, Eb is zero. What does the KVAR means? (pu = actual value/ base value). Resolution:The main function of an interposing current transformer is to balance the currents supplied to the relay where there would otherwise be an imbalance due to the ratios of the main current transformers. Hence, voltage is induced in both the windings. The difference between the electronic and ordinary electrical regulator is that in electronic regulator power losses are less because as we decrease the speed the electronic regulator gives the power needed for that particular speed but in case of ordinary rheostat type regulator, the power wastage is same for every speed and no power is saved.In electronic regulator, triac is employed for speed control by varying the firing angle speed and it is controlled but in rheostatic ,control resistance is decreased by steps to achieve speed control. so I requested to you Sir please sent all electrical interview questions and also with all electrical multiple questions if possible. Hence, according to Faraday’s laws of electromagnetic induction, emf will be induced in both the windings. How many types of colling system it transformers? while breaking the circuit, the contact terminals will be separated. That means once side current is going and not returning and hence This effect of supporting and opposing of main flux to armature flux is called armature reaction. What is vacuum circuit breaker.define with cause and where be use it Device? Explain thin film resistors and wire-wound resistors Normally it is used where normal current is more than 100A. What will happen if DC supply is given on the primary of a transformer? Following motors are used: –. What is the function of interposing current transformer? 111. The phenomenon when the depletion region expands and the potential barrier increases leading to a very high electric field across the junction, due to which suddenly the reverse current increases under a very high reverse voltage is called Zener effect. Operation carried out in Thermal power stations? generators r used for the production of electricity. 64. Resolution:Reverse Power flow relay are used in generating stations’s protection. Fuses are burned at the time of over current flows in the circuit but breakers are just open(not burn) at the time of over current flow. The current currying of cables will change depending upon the site temperature (location of site), type of run (it will run through duct, trench, buried etc. Both have the same principle of electromagnetic induction, the only difference is that their construction. 76. CMRR: It can be defined as the ratio of differential voltage-gain to common made voltage gain. Soil Mechanics and Foundation Engineering, Read Online Electrical Engineering Job Interview Questions And Answers, Electrical Engineering Interview Questions, Download Electrical Engineering Interview Questions. 39. Which type of A.C motor is used in the fan (ceiling fan, exhaust fan, pedestal fan, bracket fan etc) which are find in the houses ? Over voltage relay meant for sensing over voltages & protect the system from insulation break down and firing. The relay itself may have up to 24 contact points within the unit itself. Type of electrical output: dc, variable- frequency ac, and constant- frequency ac. Resolution:Mainly transformer has high inductance and low resistance.In case of DC supply there is no inductance ,only resistance will act in the –> electrical circuit. step down an unregulated dc input voltage to produce a regulated dc output voltage using a circuit known as Buck Converter or Step-Down SMPS. Stored energy is available immediately because there is no lag of time for delivering the stored energy. Digital phase converter are a recent development in phase converter technology that utilizes proprietary software in a powerful microprocessor to control solid state power switching components. In order to find the second terminal we should recourse to its definition: Earth Resistance is the resistance existing between the electrically accessible part of a buried electrode and another point of the earth, which is far away. Near distribution transformers and out going feeders of 11kv and incomming feeder of 33kv and near power transformers in sub-stations. 1 ton = 12000 BTU/hr and to convert BTU/hr to horsepower, 12,000 * 0.000929 = 4.715 hp therefore 1 ton = 4.715*.746 = .5 KW. 28. what is the difference between synchronous generator & asynchronous generator? Please describe yourself, your background briefly. So high electrical current will flow through primary side of the transformer.So for this reason coil and insulation will burn out. 220v AC rating. They give operators the ability to monitor the both perturbations on the power supply, as well as power used within a building, or by a single machine or appliance. Happens if i connect a capacitor across an alternator at no load synchronous impedance of generator. Is often a motor with the the starting current high in a JFET, the. This article provides questions asked in a job at an engineering firm banks are in connected in series with the! 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