initial voltage is built up by residual magnetism.It gives the starting torque to the generator. 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. How tube light circuit is connected and how it works? We additionally provide variant types and plus type of the books to browse. Which type of oil is used as a transformer oil? So it should be zero lagging like inductor. What is the significance of vector grouping in Power Transformers? Refrigerators â Capacitor split phase motors. Why an ac solenoid valve attract the plunger even though we interchanges the terminal? 89. 47. The armature flux has an important role for the running condition. called on grid systems and they might work on off grid systems that are not connected to the system. ENGINEERING Interview Questions for Freshers : We provide engineering interview questions with answers pdf free download for Freshers Experienced & Mcqs objective type lab viva basic general questions book. The complete wire wound resistor is coated with an insulating material such as baked enamel. Some of the more common labels, like progressive, consultative, persuasive, can have several meanings or descriptions depending on which management guru you listen to. Well into the 170s, polychlorinated biphenyls (PCB)s were often used as a dielectric fluid since they are not flammable. when breaker is close at one time by close push button,the anti pumping contactor prevent re close the breaker by close push button after if it already close. Star delta starter circuit comes in circuit first during starting of motor, which reduces voltage 3 times, that is why current also reduces up to 3 times and hence less motor burning is caused. What is the difference between MCB & MCCB, Where it can be used? By connecting static capacitors in parallel with the load operating at lagging power factor. Output voltage is greater than the input voltage or receiving end voltage is greater than the sending end voltage. And electrical engineering & electronics engineering ? Anticipating your kind co-operation. Wire wound resistors â length of wire wound around an insulating cylindrical core are known as wire wound resistors. produce multiple dc outputs using a circuit such as the fly-back converter. Typical Project Engineer Interview Questions. so, interchanging of terminals in ac system does not show any difference. 85. Stored energy is available immediately because there is no lag of time for delivering the stored energy. Combustion-resistant vegetable oil-based dielectric coolants and synthetic pentaerythritol tetra fatty acid (C7, C8) esters are also becoming increasingly common as alternatives to naphthenic mineral oil. Due to following reasons, AC systems are preferred over DC systems: Actually the thing is vacuum has high arc quenching property compare to air because in VCB ,the die electric strengths equal to 8 times of air . and is of sinusoidal in natureâ¦due to polarity change of rotor poles(i,e) N-S-N-S. 69. 33. why syn. 165. i am going to install a oo kva transformer & 380 kva DG set what should the earthing value? Sir, 96. Availability: As the percentage of the time a unit is available to produce power whether needed by the system or not. 50. 162. The pulse train is fed to electronic circuitry for electrical signals. Electric traction means use of the electricity for all the above machines. Utilization of electrical energy output: in conjunction with battery or other form of storage, or interconnection with power grid. 25. what is the principle of motor? Why we do 2 types of earthing on transformer (ie:)body earthing & neutral earthing , what is function. Now a days, magnetic traction is also used for bullet trains.and basically dc motors are used for electric traction systems. 44. You have remained in right site to begin getting this info. 21. 114. dear respected sir, i am unemployed student in andhra pradesh. preparing for competating exams.i followed your questions .it was very usefull to me. Significant reduction in aerodynamic stresses, which are associated with constant â speed operation. Star delta starter is preferred with induction motor due to following reasons: 142. 104. 109. Advantages of vvvf drives over non vvvf drives for EOT cranes? online ups having high volt and amp for long time backup with with high dc voltage.but ups start with 2v dc with 7 amp. Sir am completing my electrical engineering diploma this year ….can you send me a PDF of questions answers for my first interview preparation I will be very thankful to you…. Yes because the poles changes for every half-cycle of ac voltage so the polarity of AC voltage is continuously changing for every half cycle. 76. Due to any problem in instrument (i.e) broken wire, its output reduces to 0 mA. Civil Engineer Interview Questions . Volt Amps with Reactive component. They also prepare project budgets and monitor and manage technical aspects of projects. 120. Prepare for the Instrumentation Project Engineer Interview with answers. Vout/Vin, 198. 110. where the auxiliary winding and the control winding have a phase split of 90 degree. By putting these value on Relation- 5. â¢ Maximum demand, 54. What is an exciter and how does it work? If we connect tapings to low voltage side, sparks will produce while tap changing operation due to high current. State the difference between generator and alternator? If we give 2334 A, 540V on Primary side of 1.125 MVA step up transformer, then what will be the Secondary Current, If Secondary Voltage=11 KV? MOSFETâs have input impedance much higher than that of JFETâs. 97. LA is installed outside and the effect of lightning is grounded,where as surge arrestor installed inside panels comprising of resistors which consumes the energy and nullify the effect of surge. This includes the maximum power from the network and in this case the load resistance is being is equal to the resistance of the network and it also allows the resistance to be equal to the resistance of the network. 220v AC rating. 139. Most Asked Technical Basic CIVIL | Mechanical | CSE | EEE | ECE | IT | Chemical | Medical MBBS Jobs Online Quiz Tests for Freshers Experienced. What is meant by regenerative braking? Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. Resolution:Since two bulbs are in series they will get equal amount of electrical current but as the supply voltage is constant across the bulb(P=V^2/R).So the resistance of 40W bulb is greater and voltage across 40W is more (V=IR) so 40W bulb will glow brighter. Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses. A fixed width pulse is generated for each cycle. Resolution:It reduces the harmonics and it also reduces sparking and arching across the mechanical switch so that it reduces the voltage spike seen in a inductive load. They will work to schedule, plan, forecast, resource, and manage the technical aspects of a project to ensure the project's overall accuracy and quality. What is the full form of KVAR? Define What is the function of anti-pumping in circuit breaker? What is the main use of rotary phase converter ? Define what is difference between fuse and breaker? What is meant by insulation voltage in cables? Low lagging power factor causes a large voltage drop, hence extra regulation equipment is required to keep voltage drop within prescribed limits. Ans : There are two types,(1) static Electricity and (2) Current Electricity. State the factors, for the choice of electrical system for an aero turbine. Generator and alternator are two devices, which converts mechanical energy into electrical energy. Different type of DC motors and their applications are as follows:-. State the methods of improving power factor? This article provides questions asked in a job interview for professional electrical engineering positions, and assists with â¦ 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) Also there are many PSU’s and private Companies which announce, various vacancies for the recruitment of Electrical Engineering candidates on various vacant posts. fashion for smooth current reversal, which otherwise would result in sparking at the brushes. Thanks and best wishes for all engineers There are two types of exciters, static exciter and rotory exciter.purpose of excitor is to supply the excitation dc voltage to the fixed poles of generator.Rotory excitor is an additional small generator mounted on the shaft of main generator. Download 70 Question & Answers for HVAC Engineer Interview These technical questions for HVAC interview are the top questions that come any interview for airconditioning, heating or ventilation jobs. What is a differential amplifier? Because Current flow in the conductor is inversely proportional to the conductor diameter. Reserve generating capacity: Extra generation capacity installed to meet the need of scheduled downtimes for preventive maintenance is called reserve-generating capacity. I can give you some ideas about the practical part of this interview, and list questions you may get, but the truth is that in every good company you will deal with several short case studies.. You will have to demonstrate your way of thinking and practical skills when it comes to engineering â¦ If a differential amplifier is perfect, CMRR will be infinite because in that case common mode voltage gain would be zero. So if any short circuits occur in the system first high currents bypassed in the Earthling terminal. If we use high efficiency power plants to supply the base load,we can reduce the cost of generation.Hydel power plants have a higher efficiency than thermal & nuclear power plants. so I requested to you Sir please sent all electrical interview questions and also with all electrical multiple questions if possible. Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. Zero crossings of the sine wave to trigger a monostable (pulse generator) is a way to determine alternating current frequency. a. So delta / star transformer is used for lighting loads. It is given by Voc / (Ri + RL). Most efficient form of storing energy portably. What is the difference between MCB & MCCB, Where it can be used? When the voltage difference is big it will damage the lamp and when the difference is smaller the lamp will glow depending on the type of lamp. Why do you want to leave â¦ waiting for your great help to me settle in future. And electrical engineering & electronics engineering ? D.C.Generators are classified into two types: 35. A. As a result, the flux is set. synchronous machines have capability to work on different power factor(or say different imaginary power varying the field emf. What is your background? It is usually expressed as a percentage of synchronous speed (Ns) and represented by the symbol âSâ. 37. As we know that Electrical is having two type of load, Active and Reactive .Capacitor is a reactive load which is not considering as a load,& its factor is Isin@ .Meter is design based on Current RMS value because of it meter is showing the current RMS value. Tell me in detail about c.t. Looking for industrial automation engineer jobs? State the difference between generator and alternator DC or Static Resistance: DC resistance can be explained as the ratio of the dc-voltage across the diode to the direct current flowing through it. In three pin plug 6 Amp. 31. 3. A variable frequency transformer is a doubly-fed electric machine resembling a vertical shaft hydroelectric generator with a three-phase wound rotor, connected by slip rings to one external ac power circuit. Comment on the working principle of operation of a single-phase transformer. KVAR means âKilo Volt Amperes with Reactive componentsâ. Questions â¦ 2.What are the types of electricity ? So high electrical current will flow through primary side of the transformer.So for this reason coil and insulation will burn out. Sir, its just an extra-ordinary piece of compilation. 71. Thanks. This computer humming sound is coming due to ionization (breakdown of air into charged particles) of air around transmission conductor. Use of switch mode power converter in real-time basis? Industrial automation engineer design, program, simulate and test automated machinery and processes in order to complete the tasks. 147. Resolution:ELCB is used to detect earth leakage fault. We can have the frequency at any frequency you like, but than you must also make your own motors,high voltage transformers or any other equipment you want to use.We maintain the frequency at 50hz or 60hz because the world maintains a standard at 50 /60hz and the equipments are are made to operate at these frequency. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission What is slip in an induction motor? So KVAR is stand for âKilo thanks, Sir please send me interview and electrical basis mcq pdf qudstion, awesome site for comptative question answer. This method is more suitable than a direct counter, as it can get good accuracy in a second or so. No.We canât sense the over voltage by just measuring the current only because the current increases not only for over voltages but also for under voltage(As most of the loads are non-linear in nature).So,the over voltage protection & over current protection are completely different. power losses tend to be less because as we minimize the speed the electronic reg. (B) the contact resistance of the surrounding earth to the electrode. The machine is started as a squirrel cage induction motor first. There are two types of losses occurring in transformer: 176. Most of the time the last digit tells you how many zeros to write after the first two digits and these are read as Pico-Farads. The two types of earthing are Familiar as Equipment earthing and system earthing. A direct-current torque motor is mounted on the same shaft.