Transmission And Distribution Interview Questions And Answers Pdf

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Transmission and Distribution Objective Questions

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. P-V curve designed in the 18th century to understand the efficiency of the engine. Synchronous Condenser , referred to Synchronous Phase modifier or Synchronous compensator, is an advanced technique of enhancing power factor. This is a type of motor that runs without using a mechanical load. By varying the excitation of its field winding, Synchronous condenser can absorb or produce the reactive volt-ampere.

It is great to use a synchronous condenser for power factor improvement higher than kVAR whereas a static capacitor bank is used for lower-rated systems. Tariff term is described for the tax imposed on the products imported from the foreign countries to make it costly.

As a result, the products cost increase and become less desirable or less competitive versus domestic goods and services. The cause of implanting Tariff is to restrict the trade from specific foreign countries or minimize the importation of a particular good.

Transmission lines are used for large distances and they have higher voltage so that they can transport more electricity. In other words, the transmission line carries the electricity from power plants to substations. Distribution lines are used to transport electricity for a short distance. As the voltage is lower, they can transport electricity locally. It carries the electricity to the homes from the substation. Relay is the switches that perform the closing and opening of the circuit.

They perform this function electronically as well as electromechanically. Relay is used in a number of applications like manufacturing, control panels and building automation to control the power. Types of Relay:There is a wide variety of relay which are differentiated on the basis of working principles, operation and polarity:. Nuclear Power plant is used to generate electricity from nuclear fission. The heat is generated with the help of nuclear reactors and Rankine cycle convert the water into steam.

This steam is further used to spin the turbine and generator. Nuclear power provides 11 per cent of the total electricity produced in the world. Below mentioned is the list of the components that are used in nuclear power plants to generate the electricity.

The process of obtaining a uniform distribution of dielectric stress or voltage gradient in a dielectric is called grading of cable. The dielectric stress is minimum at the outermost sheath of the conductor whereas it is maximum at the surface. This non-uniform distribution of the stress causes insulation to break down and increases the thickness of the cable.

So, to avoid this, the uniform distribution of dielectric stress is achieved with the grading of cables. Pumped-storage hydroelectricity is also referred to as pumped hydroelectric energy storage is a type of hydroelectric energy storage which is used for load balancing. When there is a high demand for electric power, water from the reservoir is released through turbines to generate electric power.

It has the largest capacity of storage available for the grid. Ferranti effect is a phenomenon that describes the voltage increase at the receiver of a transmission line compared to the voltage at the sending end. It can be seen when either the load is very small or no load is connected. Internal Faults : Internal faults are phase to phase fault and it causes the system component failure. Internal faults can occur due to winding failure and overheating.

If the cooling system fails then it can also cause the mechanical fault. Testing and maintenance is the best way to avoid internal faults. External fault : An external fault occurs outside the system or transformer. It does not involve hardware failure.

External problems like lightning strikes can cause damage. Even if the air temperature exceeds a threshold value, it is a fault. As these things are not predictable, it can only be solved after the causing condition no longer exists. So, it is important to prepare for these kinds of situations.

External faults are minor but it can lead to system failure if the problem is not resolved. Earthing: Earthing is used to protect against the unwarranted spikes and bouts of electricity as these are a threat to life. Earthing is done by installing an earth wire from the device to the ground. Earth wire is used to provide a very low resistance path for the flow of current to ground. By this, a person will not get the shock. Grounding: With the help of Grounding, insulation against accidental currents is obtained.

The main wire is connected to the power supply and another part of the wire is under the bed. It avoids overloading and other dangerous effects. Sag is defined as the difference in the level between the lowest point of the conductor and the highest point of supports tower or pole where the conductor is attached.

It is mentioned in the given figure by point S. Sag is very important for safety purposes. For the better quality and continuity of electrical service, sag needs to be analyzed. Bus Bar protection as the name suggests is used to protect the busbar from any default. In case of fault occur on the bus bar, all the supply is disturbed and the feeders are disconnected.

There are many reasons for the fault, like the failure of circuit breakers, failure of support insulators and foreign object accidentally falling across the bus bar.

Followings are the most used schemes for bus zone protection: -. Two or more sub-conductor together form a bundle conductor. It works as one phase conductor. One phase can be made of one, two, three or four sub conductors. Bundle conductor is used for voltages which are greater than 22 kV. The main purpose of the bundle conductor is the transmission. It maintains voltage and enhances efficiency by reducing the inductance and skin effect. It is defined as the minimum voltage at which corona discharge started to occur.

In other words, the voltage at which breakdown of the dielectric strength of air occurs. It is signified by. In a system, Slack bus is used to maintain the balance the active power P and reactive power Q during the load flow studies.

It either emits or absorbs the active or reactive power to and from the system. When the flow of power in the transmission line is in a specific direction, the direction relay is used. Thank you. Electrical Engineering Interview Questions.

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Power Systems Interview Questions

Dear Readers, Welcome to Transmission and Distribution Interview Questions and Answers have been designed specially to get you acquainted with the nature of questions you may encounter during your Job interview for the subject of Transmission and Distribution. These Transmission and Distribution Questions are very important for campus placement test and job interviews. Answer: Series capacitance is provided in EHV lines to artificially reduce the series reactance of the line so as to improve stability, voltage regulation and transmission efficiency. Shunt compensation is provided to artificially reduce the line susceptance so as to improve the voltage regulation under light load condition. Answer: The problems associated with EHV transmission are corona loss and radio interference, requirement of heavy supporting structures and insulation requirments.

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300+ TOP TRANSMISSION & DISTRIBUTION Objective Questions and Answers

By which of the following systems electric power may be transmitted? If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. The wooden poles well impregnated with creosite oil or any preservative compound have life a from 2 to 5 years b 10 to 15 years c 25 to 30 years d 60 to 70 years Ans: c 7. Which of the following materials is not used for transmission and distribution of electrical power?

Transmission and Distribution Interview Questions

The generation, distribution, and transmission system together constitute a network called as Power plant. The power plant uses the form of energy such as coal, diesel and converts it into electrical energy. An example of the power system is a grid that supplies power to the other system. The protection is provided in the system to protect each and every element of the power system. If any fault occurs in the system then the relays associated with it trip all the circuit breaker so that the faulty element gets removed from the power system.

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.


Best Transmission and Distribution Interview Questions and Answers · 1. What for series and shunt compensation provided in EHV transmission.


Best Transmission and Distribution Interview Questions and Answers

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By which of the following systems electric power may be transmitted? If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. The wooden poles well impregnated with creosite oil or any preservative compound have life a from 2 to 5 years b 10 to 15 years c 25 to 30 years d 60 to 70 years Ans: c.

5 Response
  1. Martzel R.

    Transmission & Distribution Interview Questions And Answers · Question 1. Why Is Alternating Current Used For Transmission? · Question 2. What Is Corona?

  2. Ligio E.

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  3. Normand F.

    Transmission and Distribution Interview Questions. What for series and shunt compensation provided in EHV transmission lines? Series capacitance is provided.

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