Transmission of power by ac cables is impossible beyond a. The metallic sheath is provided around the insulation to protect it against the. Asked cable technician multiple choice questions and. The thickness of metallic shielding on cables is usually 3. The selection of the appropriate cable for a particular application is essential so the cable. Mcqs of underground cables power system i3140914 gtu mcq. Land issues underground cables and overhead lines have significantly different footprints through the countryside when completed. Multiple choice question mcq of electronics page15. In this page you can learn various important cable multiple choice questions answers, mcq on cable and connector, short questions and answers on cable,sloved cable objective questions answers etc. There are reduced chances of conductor theft, sabotage and illegal connections 5. They are not housed together in a pipe, but are set in concrete. A working familiarity with underground cable requirements, practices, and work operations is necessary as this guide does not cover all aspects of underground construction work. These are used in large cities and other densely populated areas where overhead construction in such area is practically impossible.
Multiple choice questions of computer networking 11 computer network is a. The breakdown of insulation of the cable can be avoided. Cables multiple choice questions and answers preparation for. The cables now are above the ground connecting poles that make the process of repairing difficult if any and lot of cables are found thus confusing the technician. Underground cable distribution up to and including 33kv infrastructure technical standards page b05.
Practicing all cables electrical engineering questions and answers in online. Underground cables are usually used in such locations as urban areas where overhead line rights of way are not available, in areas where local or state regulations override economic considerations, near airports and other locations where an overhead line may endanger lives, and in scenic areas where appearance is an important consideration. This document covers cable placing in conduit, innerduct, handholes, and manhole structures. What are the main requirements of the insulation materials. Electrical engineering objective questions mcq with answer. Multiple choice questions mcq on cables for electrical engineering.
Mcqs preparation for engineering competitive exams home engineering multiple. Moving forward, we must understand various types of underground cables available to us. The minimum clearance between the ground and a 220 kv line is about. The metallic sheath is provided around the insulation to protect it against the ingress of moisture, gas and other damaging liquids acid or alkalies from the soil and atmosphere. Recommended post most important questions of dc generator mcqs on induction motor mcq on alternator 2. Oct 08, 2014 1082014 cables multiple choice questions and answers preparation for competition exams pdf preparation for engineering preparation for engineering home i slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Underground cables an overview sciencedirect topics. These short objective type questions with answers are very important for. The underground cable can be 23 times more expensive than the overhead cable.
Multiple choice questions mcq on synchronous motors for electrical engineering 1. Electrical cables mcqs answers pdf electrical engineering. Underground cables are laid at sufficient depth a to minimise temperature stresses b to avoid being unearthed easily due to removal of soil c to minimise the effect of shocks and vibrations due to gassing vehicles, etc. The electrostatic stress in underground cables is a same at the conductor and the.
Figure 2 xlpe cables with different voltages underground xlpe cables left to right. The electrostatic stress in underground cables is 2. In congested areas where excavation is expensive and inconvenient draw in system of laying of underground cables is often adopted. The reliability of underground cable network highly depends upon proper laying of cables, quality of cable joints and branch connections etc. Mcqs of underground cables power system i3140914 gtu. Cable types mcqs with answers, mcq on cables for electrical engineering, objective questions or mcqs on cabels top cable installer interview questions and answers pdf download 1.
Accuracy is important in order to avoid excessive trenching work. Home transmission and distribution quiz questions and answers 102 top. Increase, increase increase, decreases decreases, decreases decreases, increases 22. Underground cable multiple choice questions mcq and.
In this page you can learn various important underground cable multiple choice questions answers, mcq on underground cable and connector, short questions and answers on underground cable,sloved underground cable objective questions answers etc. To protect the sheath from mechanical injury due to armouring. Cables multiple choice questions and answers preparation. Underground power cable, distribution cable, overhead. Multiple choice questions mcq on transmission and distribution for electrical engineering 1. Cables electrical engineering questions and answers gate. Mcq on transmission and distribution for electrical. Clarified cable sealing, exposed cables and terminated cables requirements, section 14. Apr 25, 2020 electrical engineering objective questions mcq with answer free pdf download. If a fault occurs in the underground cable, it is essential that the type of the fault and location of the fault should be determined as quickly and accurately as possible. These three methods are explained below with their advantages and. The electrostatic stress in underground cables is a same at the conductor and the sheath b minimum at the conductor and maximum at the sheath c maximum at the conductor and minimum at the sheath d zero at the conductor as well as on the sheath e none of the above ans. Recommended post most important questions of dc generator mcqs on induction motor mcq on alternator 2 starting methods of synchronous motor.
Underground cable system reduces the probable hazard that could have been imposed on flying aircraft and wildlife. Underground cables multiple choice questions and answers for competitive exams. Objective type question or mcq of transmission and. Conduit pipe is generally employed for protection of. Underground cable installation manual western power. Most recently cables multiple choice questions and answers pdf. The cable buried in ground for transmission and distribution of electrical power is known as underground cable. Electrical cables interview questions and answers mcqs.
Cables mcqs part1 cables mcqs part2 cables mcqs part3. Hello everyone, this session discusses the detailed theory on electric high voltage power cables. Introduction increasingly, utilities, developers and power producers seeking to build new power transmission systems are required to at least consider underground cables as an alternative to overhead lines. To avoid being unearthed easily due to removal of soil. Under ground cablesii mcqs with answers career ride.
These short objective type questions with answers are very important for board exams as well as competitive exams. Mcq on cables 1 how engineering works insulator electricity. Figures 5 and 6 depict sample transition structure designs. Following electrical engineering multiple choice objective type questions and. The underground system cannot be operated above a 440 v b 11 kv c 33 kv d 66 kv. In this post provide you latest and updated 2018 electrical mcq objective questions with answer which are help for preparation all electrical engineering exams like gate, ies, jto, psus, rrb jeaen, rrb loco pilot and technicians, ssc je, dmrc, lmrc, isro and other state level engineering exams. In single core cables armouring is not done to avoid excessive sheath losses make it flexible either of the above none of the above 3. Types of underground cables classification of underground cables the classification of underground cables can be done on the basis of several criteria.
The advantage of cables over overhead transmission lines is a easy. Underground power cables theory high voltage electric. Transmission of power by ac cables is impossible beyond a 35 to 45 km b 500 km. The innerduct may be direct buried or placed in larger diameter.
In practice, underground cables are generally required to deliver 3phase power. What is the purpose of bedding on the underground cables. Underground cable multiple choice questions and answers. The materials whose electrical conductivity is usually less than 1. Underground cables are laid at sufficient depth so as to. Then the trench is covered with bricks and stones to protect the cables from mechanical injury. Section one cable design and application section one explains cable design based on requirements for power and amperage ratings, cable dimensions, and fault current carrying capability. Electrical circuit analysis multiple choice questions and answers pdf to. Lecture notes,seminor topics,lab viva pdf ppt doc book free download.
Dielectric strength of rubber is around 5 kvmm 15 kvmm 30 kvmm 200 kvmm 2. This electrical cables mcq contains 20 multiple choice questions. Multiple choice objective question on power system part 1. Fault currents when calculating the time a conductor can carry a particular fault current, or. Sep 02, 2014 the electrostatic stress in underground cables is. Which of the following methods is used for laying of underground cables. There are three main methods of laying underground cables, which are i direct laying, ii drawin system and iii solid system. Technology multiple choice questions and answers pdf. All of the above 12 what is a firewall in computer network. The material generally used for armor of high voltage cables is a aluminium b steel c brass d copper. The specifications, procedures,practices and instructions contained in theucim detail the technical requirements to be followed by service providers. Underground cables can help power projects to transmit power past sensitive areas of human habitation and address the concerns of stakeholders. All of the above 12 what is a firewall in computer. The discussion is focused on transmission cables but also has relevance for distribution cable applications.
Home mcq cables electrical cables objective questions set 01. Capacitance and charging current is high in case of underground cables, so that for long distance power transmission, the charging. In an insulated cable having core diameter d and overall diameter d, the ratio of maximum to minimum dielectric stress is given by dd. Underground system is more flexible than overhead system. Underground cables important mcqs power systems crash. Free download in pdf underground cables multiple choice questions and answers for competitive exams. In environmental conscious countries, underground cable system provides spaces for large trees to be planted and grow freely. The thickness of the layer of insulation on the conductor, in cables, depends upon.
Transmission of power by ac cables is impossible beyond a 35 to 45 km b 500 km c 300 km d km answer a. For underground cables less than 345 kv, the connection from overhead to underground lines require the construction of a transition structure, also known as a riser. Electrical cables objective questions set 01 objectivebooks. Empire tape is a varnished cambric b vulcanised rubber. Mcq on cables for electrical engineering electricalnotes4u. Various aspects are taken into account while classification and these include. Mar 04, 2021 the cable is laid over the sandbelt after that cable is covered with another layer of sand. As the voltage level increases the cost of insulation is increased therefore the underground cable is restricted to low and medium voltages. What is the main reason for providing metallic sheath in underground cables. For the purpose, either threecore cable or three single core cables may be used. The insulating material for a cable should have a low cost b high dielectric strength c high. Underground cable accessories overview ieee standard 386 defines the specific interface dimensions that 200 amp and 600 series elbows, inserts, junctions, equipment bushings and any mating components must conform to ensure interchangeability. The cables now are above the ground connecting poles that make the process of repairing difficult if any and lot of cables.
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