File Name: power system engineering interview questions and answers .zip
Frequently asked interview questions with answers under the subjects like electrical machines,Transmission and distribution,Power electronics and some general basic questions. Question Question 1.
Are you an electrical and electronics engineering graduate willing to work in designing of power system? Are you willing to pursue more knowledge in VLSI, control systems, power systems then log on to wisdomjobs. Electrical Power System is a network of electrical components deployed to supply, transfer, store and use electric power. An example of an electric power system is the grid that provides power to an extended area. It is a network which consists generation, distribution and transmission system.
It is the subfield of electrical engineering that deals in preventing damage such as overheating of generators and motors, to reduce transmission losses and to maintain the ability of system to withstand and prevent voltage collapse. Question 1. Answer : The protection is organized to provide a ring of security around each and every element of power system. If there is any fault associated within the ring the relays associated with it must trip all the allied circuit breakers so as to remove any faulty element from rest of the power system.
Question 2. Answer : Faults that occur within the zone are termed as Internal Faults and that occur outside the zone of protection are termed as external faults can also be called as through faults. Question 3. Answer : The farthest point from the relay which is still inside the zone of protection is called reach point and the distance between relay and reach point is called reach. Question 4. Answer : If the adjacent zones do not overlap there will be some portion of the power system which is left out unprotected.
Question 5. Answer : The relay should allow normal load as well as a certain degree of overload to be supplied. So the pickup value of the relay should be more than maximum load. At the same time, the relay should be sensitive enough to respond to the smallest fault. So, pickup value should be less than the smallest fault current. Question 6. Answer : Naturally when a fault occurs it is sensed by both the primary and backup protection. As the operating time of primary relay is less than that of the backup relay, it will operate first.
There will be an overshoot time due to moment of inertia of moving relay system. Consider a primary relay A having operating time of 0. Assume circuit breaker operating time as 0.
Now the operating time of backup relay B will be 0. Question 7. Answer : A Definite time over current relay DTOC can be adjusted to trip out at a definite amount of time, after it picks up. It has a time adjustment setting and pickup setting. The operating principle of IDMT relay is based on the idea that more severe a fault is, the faster it should be cleared to avoid damage to apparatus.
Question 8. Consider a system where. Since the fault current as a function of fault location is proportional to , it would remain more or less constant throughout the length of feeder. Therefore, the IDMT relay will not be of much help. So DTOC relays can be used for lines which are short in length.
Question 9. Answer : Directional relays are used mainly in single end fed system of parallel feeders, ring main feeder system etc. Question Answer : 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. Fuses are used in only one time but breakers are used by multiple number of times. Answer : Resistance grounding system means connecting the neutral point of the load to the ground to carry the residual current in case of unbalanced conditions through the neutral to the ground whereas resistance earthing system is done in an electric equipment in order to protect he equipment in occurrence of fault in the system.
What Is The Power Station? Thermal power station, Hydel power station, Nuclear power station etc. What Is Slack Bus? Answer : Slack Bus is the responsible for the delivering losses in the power system. This bus is first to respond to a changing load condition. What Is Critical Disruptive Voltage? Answer : The minimum voltage at which the breakdown of the insulating properties of air occurs and corona start is called D C V.
Answer : Faults in the 3 P system can be classified under the following What Is Skin Effect? Answer : When the AC passed through the conductor the density of the current is not uniform over the cross-section of the conductor, the density of the current is very high near the surface of the conductor and very low at middle this effect is called skin effect.
Answer : A bundle conductor consists of two more parallel subconductors at a spacing of several diameters. Popular Interview Questions. All Interview Questions. Electrical Power System Practice Test. IT Skills. Management Skills. Communication Skills. Business Skills. Digital Marketing Skills. Human Resources Skills. Health Care Skills. Finance Skills. All Courses. All Practice Tests. Control Systems Tutorial Question 5.
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Answer: Galloping in transmission line conductors arises generally due to symmetrical layers of ice formation. Answer: The transmission line is not fully stretched but it is allowed to sag down. The difference in levels between point of support and the lowest point on the conductor is called sag. On what basis is the insulation level of a kv, EHV overhead transmission line decided? Answer: At transmission line voltages up to kv, the insulation level is dictated by the requirement of protection against lightning. In EHV, switching surges cause higher over voltages than lightning and are therefore mainly responsible for insulation level decision. The making and breaking currents of three phase ac circuit breakers in power system are in which form?
Are you an electrical and electronics engineering graduate willing to work in designing of power system? Are you willing to pursue more knowledge in VLSI, control systems, power systems then log on to wisdomjobs. Electrical Power System is a network of electrical components deployed to supply, transfer, store and use electric power. An example of an electric power system is the grid that provides power to an extended area. It is a network which consists generation, distribution and transmission system. It is the subfield of electrical engineering that deals in preventing damage such as overheating of generators and motors, to reduce transmission losses and to maintain the ability of system to withstand and prevent voltage collapse. Question 1.
The Power system is a network which consists of the components used in generation, distribution and transmission systems. The power system is used to produce electrical energy from coal and diesel. It has devices that are connected to the system like motor, circuit breaker, synchronous generator, transformer, conductor, etc. P-V curve or indicator diagram represent the corresponding change in pressure and volume in a system. This curve is very useful in many processes like cardiovascular physiology, thermodynamics and respiratory physiology.
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?
Power System Interview Questions. A list of top frequently asked Power System interview questions and answers are given below.
Preparation of DPR, How dimension are made for generator. Favorite BOP item. What to specify in Generator Transformer tender? Transformer Losses Penalty? Specifications Switchgear What u did in different projects?
While not always the case, how a candidate performed while attaining a degree or a doctorate is generally a good indication of how they will perform on the job. A candidate's response will also help you determine strengths and weaknesses. What to look for in an answer:. I also did well in linear algebra, and I am most proud of the grade I earned in convex optimization. I did equally well in the majority of my university's electrical engineering computer software classes. The answer to this question will help you determine how complex a project the candidate can be trusted to lead or assist with.
The generation, distribution, and transmission system together constitute a network called as Power plant.
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