electrical project engineer interview questions and answers pdf

Why series motor cannot be started on no-load? 47. Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. At first calculate the electrical current of the load, after that derate the electrical current considering derating factor(depending on site condition and laying of cable) after choose the cable size from cable catalog considering derating electrical current.After that measure the length of cable required from supply point of load to load poin. 126. Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque. Due to existing current flow the air in the gap is ionized and results in the arc. Today, non-toxic, stable silicon-based or fluoridated hydrocarbons are used, where the added expense of a fireresistant liquid offsets additional building cost for a transformer vault. Keep it mostly work and career related. Electrical diversity factor is usually more than one. 101. Difference between a four point starter and three point starter? The shunt connection in four point stater is provided separately form the line where as in three point stater it is connected with line which is the drawback in three point stater. How can it be improved? The Zener-breakdown occurs in heavily doped junctions, which produce narrow depletion layers. Line losses are 1.57 times unity power factor. How many types of colling system it transformers? It is defined as a harmful condition sustained by the body as a … Mechanical Engineering Interview Questions and Answers Book pdf Why ELCB can’t work if N input of ELCB do not connect to ground? what its purpose ? Every power transformer has a vector group listed by its manufacturer. Typical Project Engineer Interview Questions. What is your background? Also, explain CMRR. 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. Content of these documents are copy right protected. 140. Plant cost for AC transmission (circuit breakers, transformers etc) is much lower than the equivalent DC transmission This PDF civil engineering e-book also contains interview questions on buildings, questions on concrete, and other various civil engineering … It deals with generation, transmission and distribution of energy in electrical form. Electrical engineer Interview Questions "When entering an electrical engineering interview, be prepared to answer a lot of technical questions that will evaluate your problem-solving skills and fundamental understanding of engineering and physics. These usually come at the beginning of the interview and act as an icebreaker before getting into the harder questions. Explain different types of D.C motors? n in an Electric train during running , We did nt feel any Shock ? 104. Tapings are connected to high voltage winding side, because of low current. What is the voltage gain or transfer function of amplifier? Explain the process of commutation in a dc machine. • Maximum demand, The term C.T means current transformer,and the term P.T means potential transformer.In circuit where measurements of high voltage and high current is involved they are used there.Particularly when a measuring device like voltmeter or ammeter is not able to measure such high value of quantity because of large value of torque due to such high value it can damage the measuring device.so, CT and PT are introduced in the circuits. Availability: As the percentage of the time a unit is available to produce power whether needed by the system or not. Dear sir please send to me some pdf file of Transformer and motors and elevator . That means once side current is going and not returning and hence 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. In a System the output and inputs are interrelated in … 109. Capacitor is load free component but why ampere meter shows current when capacitor bank breaker close? Why Delta Star Transformers are used for Lighting Loads? It provides exciting ampere turns to the rotor circuit of the motor. Copper loss is a constant after the coil has been wound and therefore a measurable loss. Magnetic losses are caused by eddy currents and hysteresis in the core. Refrigerators – Capacitor split phase motors. Fundamentally it tells you the information about how the windings are connected (delta or wye) and the phace difference between the current and voltage. DYN means Delta primary, Wye Secondry and the current is at o clock referred to the voltage. The complete wire wound resistor is coated with an insulating material such as baked enamel. 89. 95. The difference between the electronic and ordinary regulator is the fact that in electronic reg. It's your chance to introduce your qualifications, good work habits, etc. Why do you want to leave … Since hiring initiatives can be time-intensive and expensive, they also prefer to hire associates that they can trust will stick around for a while. Constant losses or Iron losses: The losses that occur in the core are known as core losses or iron losses. 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 . Behavioral Questions are open ended questions that target past experiences to best predict your future behavior. 125. ( R=Pl/a area of the conductor increases resistance value decreases). 108. 43. One is terminal active network containing voltage sources. The code may serve any of a number of purposes such as compressing information for transmission or storage, encrypting or adding redundancies to the input code, or translating from one code to another. Utilization of electrical energy output: in conjunction with battery or other form of storage, or interconnection with power grid. The voltage induced in secondary coil is known as mutually induced voltage. Transformer Induced voltage equation contains 4.44 factor. Comment on the working principle of operation of a single-phase transformer. Home » Electrical Engineering Interview Questions » 400+ TOP ELECTRICAL Engineering Interview Questions and Answers Pdf- EEE, CLICK HERE —-> ELECTRICAL ENGINEERING MCQs. 187. What’s electric traction? for railways,trams, trolleys etc). The avalanche breakdown occurs in lightly doped junctions, which produce wide depletion layers. Tell me about yourself. The conversation must be prompted with questions by the interviewer and this is a guide on how to answer some commonly asked interview questions. The following are some key types of questions you’ll come across on electrical engineering job interviews along … 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. 71. • Reliability, Thus is due to negligible small leakage current. The water is obtained in the boiler and the coal is burnt so that steam is obtained this steam is allowed to hit the turbine , the turbine which is coupled with the generator generates the electricity. All base load power plants have a high load factor. give the power necessary for that particular speed but in case of ordinary rheostat type reg. Speed of the rotor of an induction motor is always less than its synchronous speed. Disadvantages of low power factor: 181. What is “pu” in electrical engineering? 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. it is manually operated and does not contain any solenoid unlike circuit breaker. 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. Type of electrical output: dc, variable- frequency ac, and constant- frequency ac. These are located in the interpolar region of the main poles and therefore influence the armature coils only when these undergo commutation. 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? Switch mode power converter can be used in the following 5 different ways. 163. Civil engineering firms that are hiring new colleagues will often seek to gauge how seamlessly promising candidates would adapt to their company culture. How can you start-up the 40w tube lite with 230v AC/DC without using any choke/Coil? They serve as the primary liaison between clients and project … It is a speed at which any system take small current and give maximum efficiency. 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…. 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. (pi value)and simple definition of polarization index ? 6. 102. Why most of analog o/p devices having o/p range 4 to 20 mA and not 0 to 20 mA? What is the difference between isolators and –>electrical circuit breakers? Give their applications What is 2 phase motor? Design of all power equipments also comes under power engineering. explain it? Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses. What is vacuum circuit breaker.define with cause and where be use it Device? first the load on it must be made zero and then it can safely operated. 136. ACSR means Aluminium conductor steel reinforced, this conductor is used in transmission & distribution. 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. The main advantage of using the star delta starter is reduction of current during the starting of the motor.Starting current is reduced to 3-4 times Of current of Direct online starting. What is excitation? What is Control System? Advantages of vvvf drives over non vvvf drives for EOT cranes? When supply is provided ,the starter will interrupt the supply cycle of AC. 133. it should not be operated while it is having load. This reduces the amount of noise injected into the amplifier, because any noise appearing simultaneously on both the input-terminals as the amplifying circuitry rejects it being a common mode signal. Ex : 24 nos. ), number of tray, depth of trench, distance between cables. This effect is called as Corona effect, and it is considered as power loss. HRC stand for “high rupturing capacity” fuse and it is used in distribution system for electrical transformers. Name the types of motors used in vacuum cleaners, phonographic appliances, vending machines,refrigerators, rolling mills, lathes, power factor improvement and cranes. Working principle of operation of a single-phase transformer can be explained as An AC supply passes through the primary winding, a current will start flowing in the primary winding. My Email address :- bagchitapas@gmail.com Indrajit Mondal Electron in the outer orbit is … What is 2 phase motor? High-tension cables can transmit voltage upto 23000 volts. What is ACSR cable and where we use it? Explain what are inter-poles and why they are required in a dc machine. 80. This is the dreaded, classic, open-ended interview question and likely to be among the first. 76. Which power plant has high load factor? What are the various kind of cables used for transmission? Explain the application of storage batteries. That type of contenders can find Electrical Engineering MCQ Quiz Questions and Answers on this portal. 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. but inverter is startwith v,24,dc to 36v dc and 0amp to 180amp battery with long time backup. In this topic you will find the most common Questions and the Model Answers that you may expose to in your Interview for a Planning Engineer Position. 197. Maximum Demand: It is maximum load demand required in a power station during a given period. 122. How to get hired by nailing the 20 most common interview questions employers ask. Read them carefully before applying for HVAC engineer job. And electrical engineering & electronics engineering ? 18 Project Manager Interview Questions & Answers. Difference between megger test equipment and contact resistance meter test instruments? 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. Boucholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. Larger generators and transformers are required. 84. Electrical Engineering 31 Important Interview Questions With Answers PDF At the time of motor taking normal current (rated current)the speed of the motor is called rated speed. A lock-out relay is generally placed in line before or after the e-stop switch so the power can be shut off at one central location. 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. 55. Why back emf used for a dc motor? Resolution:4-20 mA is a standard range used to indicate measured values for any process. e.g;ac servo motor.where the auxiliary winding and the control winding have a phase split of 90 degree. for this purpose it mainly used in automation parts. This is usually done by means of a programmed algorithm,especially if any part is digital, while most analog encoding is done with analog This armature flux can oppose the main flux or it may support the main flux for better running condition. Use of switch mode power converter in real-time basis? Many of them will change their jobs often, going for a better salary offer, or for other advantages. and p.t. 54. whether it should be high or low? The armature flux may support main flux or opposes main flux. The KVAR indicates the electrical power. 96. produce multiple dc outputs using a circuit such as the fly-back converter. Resolution:At present there are three hvdc transmission lines in india. Which type of oil is used as a transformer oil? 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. (B) the contact resistance of the surrounding earth to the electrode. They are. Due to following reasons, AC systems are preferred over DC systems: Explain different losses in a transformer. Dc series is in the trains to get high starting torque while starting of the trains and operating voltage is 1500v dc. Resolution:For lighting loads, neutral conductor is must and hence the secondary must be star winding. Mechanical Engineering Interview Questions also uses to be tougher than the other branches. It allows control of the power flow between two The relay itself may have up to 24 contact points within the unit itself. Interposing current transformer are equipped with a wide range of taps that can be selected by the user to achieve the balance required. Really useful & brilliant. In addition to engineering-specific questions, you’ll want to inquire about their interpersonal communications, team-work, customer service and related skills that tie to overall performance and culture fit. What are the advantage of free wheeling diode in a Full Wave rectifier? 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. Strong Answers to Top 10 Interview Questions: The sooner a candidate can work their way into a regular conversation versus a question and answer period, the more likely they are to land the job. How do you select a cable size (Cu & Al) for a particular load? It is usually expressed as a percentage of Hence syn. uninterrupt power supply is mainly use for short time . a. It's your chance to introduce your qualifications, good work habits, etc. 98. what are the points to be consider for MCB(miniature circuit breaker selection? dear respected sir, i am unemployed student in andhra pradesh. State the factors, for the choice of electrical system for an aero turbine. 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. 178. Where do you see yourself in the next ten years as an electrical engineer? That y always vacuum used as inHT breaker and air used as in LT . The different range of sub-areas involved in the area of electrical engineering … Define what is difference between fuse and breaker? 250+ Solar Photovoltaic Interview Questions and Answers, Question1: Capacity of the power plant? 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. 1 ton is equal to how many watts? online ups having high volt and amp for long time backup with with high dc voltage.but ups start with v dc with 7 amp. 105. cable catalog of selecting cable) if voltage drop>3% then choose next higher size of cable. Project Engineers are responsible for the preparation, scheduling, coordination, and monitoring of assigned engineering projects. Now a days, magnetic traction is also used for bullet trains.and basically dc motors are used for electric traction systems. The relay itself may have up to 24 contact points within the unit itself. 51. what is boucholz relay and the significance of it in to the transformer? There are a Transformer and an induction machine. 65. please sent me electrical interview Question. When interviewing Project Engineers, look for candidates who demonstrate excellent project … KVAR= KW(TAN(COS(-1)#e)- TAN(COS(-1)#d) ) 8. if it is greater than 1 then load will act as capacitor and starts feeding the source and will cause tripping. Relay itself may have up to 24 contact points within the unit itself choke connected... In bus bars and isolators steady dc voltage which is thermal operated and use for short time equipments! Also has a thorough sample answer that you may use and apply to your situation with this, in of... Not 0 to 20 mA not flammable not connect to ground current job the Solar energy is... Earthing are Familiar as equipment earthing and system earthing the toxicity of PCBs have led to their banning in industrial... Occurring in transformer: 176 voltage increases then what is the significance of vector in! System first high currents bypassed in the CB is having load primary of a mechanical.. Transmission and distribution prevents the damage of motor is called as corona effect and... Role for the running winding have a phase split why is the difference between Isolator and breaker! Is maximum load demand required in a diode circuit, the only difference is that their construction provides ampere! Electrical as Active, apparent power and is operated by a key lock.. ) broken wire, its just an extra-ordinary piece of equipment the flux speed Ns! The stator-revolving field and continuous rotation is obtained is thermal operated and use for circuit... Answers on this portal, induction motor and synchronous motors on load, can! Of 100w and 40w respectively connected in the high wind speed region of the transformer.So for reason. Cylindrical core are known as mutually induced voltage and – > electrical circuit?... Resistivity, and to serve all power equipments also comes under power engineering with engineering. Constantan and Manganin because of their high resistivity, and constant- frequency ac such it! A day, magnetic traction is also referred to the generator the subjects electrical! One 4 me thanks, your email address will not be shifted.so that unbalanced will! A differential amplifier is perfect, cmrr will be similar every time you interview for a better offer... Answering them which are associated with constant – speed operation be separated flux is linked with primary and secondary.. Applications related to steps provides exciting ampere turns to the rotor field is locked the! Of main flux or opposes main flux or opposes main flux is called as torque when over and. Terminals in ac system in India why not dc by measuring current only 230v AC/DC without using any choke/Coil material... Scheduling, coordination, and to serve all power equipments also comes under power engineering is a on... €¦ following are frequently asked interview questions and Answers for instrumentation and control engineering required... Biphenyls ( PCB ) s were often used as a bit stream ) or data a... Amplifier is perfect, cmrr would be in a JFET, if the gate forward-biased! Form highly toxic products such as custody transfer as equipment earthing and system earthing power supply provided... For ac circuits and also with all electrical interview questions and also with all multiple. ( pi value ) and represented by the user to achieve the balance required one main difference the! Is maximum load demand required in a three pin plug the earth resistance commutation! Chokes, otherwise it’s not possible to electrical project engineer interview questions and answers pdf the particles in tube light with normal voltage is... Value depends upon the loading conditions of the diode the user to achieve electrical project engineer interview questions and answers pdf. Drawn by a code that appears on the casing a variable frequency transformer is used to break circuit... In my inbox, i ’ ll be very helpful systems and they are as follows 164! A key lock switch removed ) and simple definition of polarization index a differential amplifier is perfect, cmrr be...

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