File Name: electrical maintenance engineer interview questions and answers .zip
Pu stands for per unit and this will be used in single line diagram of power distribution and it is like a huge electrical circuit with no of components generators, transformers, loads with different ratings in MVA and KV.
Those values are called as pu values. Operation carried out in Thermal power stations? 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. Why link is provided in neutral of an ac circuit and fuse in phase of ac circuit? Link is provided at a Neutral common point in the circuit from which various connection are taken for the individual control circuit and so it is given in a link form to withstand high Amps.
But in the case of Fuse in the Phase of AC circuit it is designed such that the fuse rating is calculated for the particular circuit i. So if any malfunction happen the fuse connected in the particular control circuit alone will blow off. How tube light circuit is connected and how it works?
A choke is connected in one end of the tube light and a starter is in series with the circuit. When supply is provided ,the starter will interrupt the supply cycle of AC. Due to the sudden change of supply the chock will generate around volts. This volt will capable of to break the electrons inside the tube to make electron flow. It is used with generators for charging a number of capacitor in parallel and discharging them in series. It is used when voltage required for testing is higher than the available.
What is encoder, how it function? An encoder is a device used to change a signal such as a bit stream or data into a code. 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. This is usually done by means of a programmed algorithm,especially if any part is digital, while most analog encoding is done with analog circuitry. What are the advantages of speed control using thyristor?
Advantages :. Why Human body feel Electric shock?? Unfortunately our body is a pretty good conductor of electricity, The golden rule is Current takes the lowest resistant path if you have insulation to our feet as the circuit is not complete wearing rubber footwear which doing some repairs is advisable as our footwear is a high resistance path not much current flows through our body. The electric train is well insulated from its electrical system. Whenever a current carrying conductor is placed in an magnetic field it produce turning or twisting movement is called as torque.
The effect of armature flu to main flux is called armature reaction. The armature flux may support main flux or opposes main flux. Bulbs [devices] for AC are designed to operate such that it offers high impedance to AC supply. Normally they have low resistance. When DC supply is applied, due to low resistance, the current through lamp would be so high that it may damage the bulb element.
DC Series motor has high starting torque. We can not start the Induction motor and Synchronous motors on load, but can not start the DC series motor without load. What is vacuum circuit breaker. A breaker is normally used to break a circuit.
At the time of separation an air gap is formed in between the terminals. Due to existing current flow the air in the gap is ionized and results in the arc. What will happen when power factor is leading in distribution of power? If their is high power factor, i. What is 2 phase motor? A two phase motor is a motor with the the starting winding and the running winding have a phase split.
What is the significance of vector grouping in Power Transformers? Every power transformer has a vector group listed by its manufacturer. Fundamentally it tells you the information about how the windings are connected delta or wye and the phace difference between the current and voltage. 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? Its Single Phase induction motor which mostly squirrel cage rotor and are capacitor start capacitor run.
Give two basic speed control scheme of DC shunt motor? By using flux control method:in this method a rheostat is connected across the field winding to control the field current. This type of generators are used in windmills. What is the Polarization index value?
Its ratio between insulation resistance IR i. Why syn. Hence syn. Enlist types of dc generator? Generators are classified into two types:. It is important part in Synchronous Generators, it controls the output voltage of the generator by controlling its excitation current. Thus it can control the output Reactive Power of the Generator. What is an exciter and how does it work? There are two types of exciters, static exciter and rotory exciter. Rotory excitor is an additional small generator mounted on the shaft of main generator.
It gives the starting torque to the generator. 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.
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. That y always vacuum used as inHT breaker and air used as in LT. What is the difference between surge arrestor and lightning arrestor?
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. What happens if i connect a capacitor to a generator load? Connecting a capacitor across a generator always improves power factor,but it will help depends up on the engine capacity of the alternator,other wise the alternator will be over loaded due to the extra watts consumed due to the improvement on pf.
Why the capacitors works on ac only? Generally capacitor gives infinite resistance to dc components i. Explain the working principal of the circuit breaker? Circuit Breaker is one which makes or breaks the circuit. Define What is the function of anti-pumping in circuit breaker? What is stepper motor.
Stepper motor is the electrical machine which act upon input pulse applied to it. How to calculate capacitor bank value to maintain unity power factor with some suitable example?
Tell me in detail about c. Company:reliance 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.
They work on the same principle of transformer, which is based on linkage of electromagnetic flux produced by primary with secondary. They work on the ratio to they are designed. There are a Transformer and an induction machine. Those two have the same supply. For which device the load current will be maximum? And why? The motor has max load current compare to that of transformer because the motor consumes real power.. What is power factor? Power factor should be high in order to get smooth operation of the system.
Low power factor means losses will be more. What is the difference between Isolator and Circuit Breaker? Isolator is a off load device which is used for isolating the downstream circuits from upstream circuits for the reason of any maintenance on downstream circuits. But circuit breaker is onload automatic device used for breaking the circuit in case of abnormal conditions like short circuit, overload etc.
Boucholz relay is a device which is used for the protection of transformer from its internal faults, it is a gas based relay. What is SF6 Circuit Breaker? SF6 is Sulpher hexa Flouride gas..
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? Just answer this question honestly. Sometime an employer wants to know if there are other companies you're considering so that they can determine how serious you are about the industry, they're company and find out if you're in demand.
Visit us Electrical Engineering Interview Questions and answer cracks the interview gets the job. This article provides questions asked in a job interview for professional electrical engineering positions, and assists with answering them. Learn about interview questions and interview process for companies.
Top 41 interview question maintenance engineer. Turn OFF your cell phone a lot of people forget this one. Bring copies of your resume and references for the interviewer as well as a pad of paper and a pen.
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Both generator and alternator work on the same principle they convert mechanical energy into electrical energy. An RLC circuit carries an electrical circuit consisting of a resistor R and inductor L and a capacitor C , connected in parallel or series. This circuit is called a second order circuit as any voltage or current in the circuit can be described by a second order differential equation. Wire is sized by American Wire Gauge system. Your installation of conductors will depend on a few factors like gauge of the wire, wire capacity, etc. For wires, smaller the wire gauge larger the ampacity or capacity of the wire to handle current.