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(b) black. Electrical Treeing in XLPE Insulated MV & HV Cables (Manuel Bolotinha) Nowadays XLPE (Cross-linkedpolyethylene) is the most used insulation material of medium and high voltage cables, which presents important advantages over PVC (Polyvinylchloride) and other insulations materials. The cable insulation must be designed such that it can withstand all expected voltages during the lifetime of the cable. 2. Several sensors used in high voltage equipments can be summarized as Since the 1965s, resin materials have been used for all types of bushing up to the highest voltages. (b) 33 kV. Rubber. Transmission and Distribution MCQ: We have listed below the best Electrical Generation Transmission and Distribution MCQ Questions, that are very helpful for the preparation of Transmission and Distribution Interview/Exam. High-Voltage Testing on Insulators. The leading cause of electrical failures is a breakdown in the insulating materials. This means testing on insulators is an extremely high priority for knowing how your assets are performing. JNTU Hyderabad B.Tech High Voltage Engineering Mid - I, September - 2014 Question Paper. (c) make both machines run as unloaded motors. There are no fixed values for solid insulation materials, even if cables with electric strength values can be found in many textbooks and journal articles. Total Marks: 70, Passing Marks (35) Q.1 Discuss various factors which affect breakdown of gases. This is the Multiple Choice Questions Part 2 of the Series in Electric Power Transmission and Distribution System Engineering as one of the Electrical Engineering topic. (c) Extra high tension. When the electric strength is increased beyond a particular value, it results in breakdown. The material generally used for armour of high voltage cables is_____? Question is The material commonly used for insulation in high voltage cables is, Options are (A) lead, (B) paper, (C) rubber, (D) none of the above, (E) , Leave your comments or Download question paper. Q1. !! OOPS Login [Click here] is required to post your answer/result 31. Insulation Material shall comply with the requirements of BS7655 for type GP4 and shall have Halogen Acid Gas Emission levels equal to, Low voltage, HOFR and zero halogen cables are insulated with EPR complying with BS7655 GP4. (a) between 2 and 3 . Partial electrical discharges are the key indicator of insulator deterioration. The phenomenon of rising in voltage at the receiving end of the open-circuited or lightly loaded line A. For large rating HV alternators, the class of insulation used is: (A) A (B) B (C) C (D) Y. Cable insulation is used to provide electrical separation between conductors of a cable. In case of three core flexible cable the colour of the neutral is. Paper. By connecting the ammeter on the side of unknown resistance as this connection gives better accuracy. Electrical Engineering MCQ [ hide] 1 Which parameter of a strain gauge varies with applied force. PLEASE COMMENT BELOW WITH CORRECT ANSWER AND ITS DETAIL EXPLANATION. cables are used for 132 kV lines. (a) blue. Login into Examveda with. 1.3.2 Catenary d) The combination of (b) and (c). You have to select the right answer to every question. 17. By Steven McFadyen on May 15th, 2012. Multiple Choice Question (MCQ) of C. Power System Protection page-2. (b) high resistivity. The material commonly used for insulation in high voltage cables is. Standards are specifications for cable insulation and Page 3. 35. on the capital outlay is equal Read about the available resin systems and reinforcements used to build these robust materials. ___is most likely to occur in cables. C. Rubber. Finally, you can also take the Online Quiz from the Take Electrical Cables Quiz Button. The insulating material for cables should (A) Be acid proof (B) Be non-inflammable (C) Be non-hygroscopic (D) Have all above properties. Lagging 34) The material generally used for the armour of high voltage cables is A. (a) insulation may melt due to higher temperature. (d) leads the voltage by 180. The presence of ozone due to corona is harmful because it_____? a) Insulation coordination b) High voltage testing of Cables c) High Voltage Impulse Generation. (b) balance loads on both sides of the neutral. MCQs of Sub-Station And Cables. Cables and Connectors Multiple Choice Questions and Answers for competitive exams. 3 In layers of impregnated paper insulation, the void cause breakdown voltage to. (c) between 8 and 10. High-Voltage Testing on Insulators. lead. A maximum at the conductor and minimum at the sheath. If variable part of annual cost on account of interest and depreciation. Answer: (c) 6 m. SHOW ANSWER. The material commonly used for sheaths of underground cables is_____? Steel 35) In transmission lines, the cross-arms are made of A. A. glaze producing agents B. clays C. filler & fluxing agents High voltage cables A. thermoplastic materials: This chapter describes in further detail the insulation and coverings mentioned previously and also describes the jackets, shields, sheaths, and other materials used in the assembly of a cable. Brass C. Aluminum D. Steel Answer .4. Since paper insulation was used first in the power industry, and was later replaced in low and medium voltage applications, any B. product of the length of the conductor in meters. During the historical development of cables, numerous types of insulation have been employed. How Insulation Breakdown Takes Place . 36. Solid type cables are not considered suitable for operating voltages exceeding 66 kV because. Any of the above. High Voltage Technology Questions Past Papers 6 Time Allowed: 3 hours. (iii) High voltage grade up to 11000 volts This tool can be used to quickly and positively confirm the performance or lack of performance! 3. A. Composite materials designed, tested and proven over decades in high voltage insulation applications. B. 5 Unequal impedance of the four gauge arms can be best compensated by. The commonly used materials for HV insulation is. The leading cause of electrical failures is a breakdown in the insulating materials. Unequal expansion may create voids insulation which leads to ionization. A major application for inorganic materials is in high and medium voltage substation equipments and overhead lines as insulators or as bushings on high voltage transformers and switchgears. 1 The insulating material for a cable should have (a) low cost (b) high dielectric strength (c) high mechanical strength (d) all of the above Ans: d What are the principal types of cables according to the insulation used? Answer: Option D. Q 22. Ans: d. Paper. 1. High dielectric strength to avoid electrical breakdown of cable. Electrical insulation materials are employed over the metallic conductors of underground cables at all voltage ratings. (b) skin effect dominates on the conductor. In particular, Cables . What is the main reason for providing metallic sheath in underground cables? power cables are discussed in the following sections. 27. (c) 66 kV. Circuit breakers. 2. Generally the material used for bus bars should have: (A) Low cast (B) Low resistivity (C) Higher softening temperature (D) All of the above. A certain cable has an insulation of relative permittivity 4. Solid paper insulated cables are suitable for application up to the MV range. Contact us for engineering and applications development support! Low thermal coefficient, low permittivity, acid proof, non-inflammable and non-hygroscopic C. High water absorption 2. Ans: b. 4. Wire and cable MCQ. rubber. These short objective type questions with answers are very important for Board exams as well as competitive exams. 27. a. 2 If length of cable is doubled, its capacitance is. Strain Insulator. Solid type cables are considered unreliable beyond 66 kV because. 50 Important Multiple choice Question Of Transformer 2021 II Electrical most asked MCQ. You have to select the right answer to the question. (a) boost the generated voltage. If the resistivity of the copper is 1.72E-8 m, then the resistance of this cable High-Voltage Testing on Insulators. Ans: a. a) The contact material only. Polymer insulation is preferably used in new installations like DC and the submarine system. High tension cables are generally used up to (A) 11 kV (B) 33 kV (C) 66 kV (D) 132 kV. It is used for making slot wedges, and liners for stator and rotor core stacks, separators in transformer windings, and slot lining. In this page you can learn various important paper insulation of cable multiple choice questions answers, mcq on paper insulation of cable, short questions and answers on paper insulation of cable,sloved paper insulated cable objective questions answers etc. (a) lags the voltage by 90. which will improve your skill. What is meant by grade of cables ? A resistance of value 10 approximately is to be measured by ammeter-voltmeter method with resistance of ammeter is 0.02 and that of voltmeter is 5000. 9 Chemical Oxidation, hydrolysis, etc. A low voltage source is being used for testing armature coils. Good mechanical properties (tenacity and elasticity). Wood C. R.C.C D. Either Steel or Wood Answer .4. Material for insulation in high voltage cables is___. Leave a Reply Cancel reply. Medium Voltage: Polyethylene (PE) Cross linked polyethylene (XLPE) Tree retardant cross linked polyethylene (TR-XLPE) Ethylene-Propylene Elastomers (EPR) PILC; High Voltage: Cross linked polyethylene (XLPE) Paper/Oil; Paper/Polypropylene; SF6 gas 1967: HMWPE insulation on UG cables in the US (Unjacketed tape shields) 1968: First use of XLPE cables for MV (mostly unjacketed, tape shields) 1972: Problems associated with water trees (MV) and contaminants (HV) Introduction of extruded semicon screens 1978: The flexibility of using a castable form of insulation has replaced paper insulation in many product areas and dominates the existing insulated bushing market. The conductors of the overhead lines are. (d) there is a danger of breakdown of insulation due to the presence of voids. (ii) Medium voltage grade upto 650 volts. (c) lags the voltage by 180. The phenomenon of rising in voltage at the receiving end of the open-circuited or lightly loaded line In terms of cost, the overhead transmission line is better than underground transmission line in the field of Insulation Right of way Visibility None of these 33. Strain Gauge MCQ. Neoprene does not have good insulating properties and is used upto 660V a.c, but has very good fire resisting properties and therefore can be extensively used as a sheathing material. (a) High tension. Up to which temperature fiber glass insulation can be used: 15. The insulating material used in cable should have. ANSWER: a. 1. The oil may lose its viscosity; it may start drawing off from higher levels. Operating voltage. Stability of arc in vacuum depends upon. 1. This Transmission and Distribution MCQ Test contains 25 best Multiple Choice Questions. They are V.I.R., P.V.C., flexible, enamelled etc. 21.1 kV (rms)/cm. 1. Raw materials used: sand, marsh gas, salt, coke and magnesium. The insulating material for a cable should have (a) low cost (b) high dielectric strength (c) high mechanical strength (d) all of the above Ans: d 2. Year Voltage (kV) 1900 1925 1950 1975 2000 600 500 400 300 200 100 0 Type Paper Polymer Figure 1 Evolution of the Highest AC Cable Voltage Insulation materials used in MV power cables have long included the mature technology of fluid-impregnated Kraft paper. C. There is a corona loss between conductor and sheath material. When measured at high voltage, power factor and dielectric constant are useful in evaluating high-voltage insulation system. (d) 132 kV. Explanation: Cables for power distribution of 10 kV or higher may be insulated with oil and paper, and are run in Which of the following protects a cable against mechanical injury ? by Present Group on 24 August, 2018. XLPE Insulated Power High Voltage Cable. For example, the cables used for supporting the deck in a suspension type bridge take the form of a parabola. The loads on distributors systems are generally (a) balanced (b) unbalanced (c) either of the above (d) none of the above Ans: b. 11. 75. (a) 11 kV. To ensure the desired performance of an electrical insulator, that is for avoiding unwanted insulator failure, each insulator has to undergo numbers of insulator test. Expansion of oil may cause the sheath to burst. (a) Bedding (b) Sheath (c) Armouring (d) None of the above Ans: c 3. The dielectric constants of several materials commonly used for insulation are given below: v. Dielectric Loss: The dielectric losses occur in all solid and liquid dielectrics due to: (i) A conduction current, and Define Townsends first and second ionization coefficients. The power factor of industrial loads is generally (a) unity (b) lagging Ans: (d) 12. (B) 500 KVA. a) The contact material only. The material commonly used for insulation in high voltage cables is_____? If the insulation is replaced by one of relative permittivity 2, the capacitance of the cable will become. That is, the insulating properties are damaged and it finally becomes a conductor.The electrical field strength at the time of breakdown is called breakdown voltage or dielectric strength. A coil short circuit will be indicated by a . 37. The insulating material used for cables should have all of the following except . The relative permittivity of rubber is. As a production test, this test is often used as a customer acceptance test, with minimum insulation resistance per unit length often specified by the customer. When a dc high voltage pulse is sent through any of these cables mentioned above, it incurs some capacitive charging current, insulation absorption current, insulation leakage current, and current at the fault to some degree. Skin effect dominates on the conductor. Impregnated paper is the most popular insulating material, especially for the land installations in the H.V and EHV lines. All of the above. MCQs: The most commonly used insulating materials for low and medium voltage cables is Category: Electrical Engineering Questions, Published by: T-Code Scripts MCQs: In paper based laminated construction, the typical value of dielectric constant and dielectric loss factor is 25. Explanation: The range of output watt for capacitor type induction motor is 90-750 and that of the repulsion start motor is 90-3700. Q 20. 17. Ans: d. 28. Answer: The metallic 4 The formula for gauge factor is. The material commonly used for insulation in high voltage cables is (a) lead (b) paper (c) rubber (d) none of the above Ans: b 36. C same at the conductor and the sheath. a. Paper. Pin insulators are used for holding the line conductors on the straight running of poles. Good tenacity is required in the materials to withstand the mechanical handling of the cables. The power transmitted will be maximum when. This Electrical Cables MCQ contains 20 Multiple Choice Questions. Properties Required for Insulating Materials. In general, the insulating materials used in cables should have the following properties : High insulation resistance to avoid leakage current. High dielectric strength to avoid electrical breakdown of the cable. High mechanical strength to withstand the mechanical handling of cables. Pin type insulators are generally not used for voltages beyond 1 kV 11 kV 22 kV 33 kV For transmission of power over a distance of 500 km, the transmission voltage should be in the range 150 to 220 kV 100 to 120 kV 60 to 100 kV 20 to 50 kV The material commonly used for sheaths of underground cables is lead rubber copper iron The breakdown of most insulation materials Cables and capacitors. Electrical Engineering MCQ [ hide] 1 Insulating material in cables should have. Stability of arc in vacuum depends upon. 5. D. resistance of the conductor ohms per meter. (b) skin effect dominates on the conductor. The main requirements of the insulating materials used for the cable are: High insulation resistance to avoid leakage current. Applications of insulating materials - Electrical Engineering (MCQ) questions and answers. Pin type insulators are generally not used for voltages beyond 1 kV 11 kV 22 kV 33 kV For transmission of power over a distance of 500 km, the transmission voltage should be in the range 150 to 220 kV 100 to 120 kV 60 to 100 kV 20 to 50 kV The material commonly used for sheaths of underground cables is lead rubber copper iron These B. Dependent on the dominant signal in high voltage equipment, most suitable sensor can be determined. Ans: b. What is a cable? ; Suspension insulators consist of a number of porcelain discs connected in series by metal links in the form of a string. Main advantages of XLPE are:. A. lead B. rubber C. copper D. iron. b) The contact material and its vapour pressure. 36 The electrostatic stress in underground cables is. 37 The intersheaths in the cables are used to. Categories Electrical Engineering MCQs Post navigation. Polymeric materials are employed as the insulation, but the nature of the polymer may vary with the voltage class. Around 83% of HV cables are paper insulated. The material commonly used for insulation in high voltage cables is (a) lead (b) paper (c) rubber (d) none of the above Ans: b. In a D.C. 3-wire distribution system, balancer fields are cross-connected in order to. B minimum at the conductor and maximum at the sheath. Multiple Choice Questions; (c) brown. by Present Group on 24 August, 2018. To ensure the desired performance of an electrical insulator, that is for avoiding unwanted insulator failure, each insulator has to undergo numbers of insulator test. 22. Partial electrical discharges are the key indicator of insulator deterioration. 76. The electric strength is a material property given in kV/mm. The leading cause of electrical failures is a breakdown in the insulating materials. 2 Strain gauges can be used to pickup. Solid type cables are considered unreliable beyond 66 kV because. 35. 4. 13. Therefore, the type of insulating material to be used depends upon the purpose for which the cable is required and the quality of insulation to be aimed at. (d) Extra An explanation of some of the dielec- tric terms is in Appendix 8A. Localization of Cable Faults. (d) between 12 and 14. Q2. (i)Low voltage grade up to 250 volts. c) The circuit parameters only. The best insulation among all insulating materials available is _____. Rotating machines. Steel B. Answer: Option B Login . Lead. b) The contact material and its vapour pressure. The material generally used for armour of high voltage cables is Introduction: The measurement of insulation resistance is a common routine test performed on all types of electrical wires and cables. c) The circuit parameters only. of the guard terminal on almost any insulation resistance tester. conductors, the insulation between aluminum and steel conductors is (a) insulin (b) bitumen (c) varnish partial discharge scanning tests. Without losing its insulting properties, Asbestos can bear a temperature up to: (A) 400 degree centigrade (B) 300 degree centigrade (C) 200 degree centigrade (D) 100 degree centigrade. IF YOU THINK THAT ABOVE POSTED MCQ IS WRONG. (a) insulation may melt due to higher temperature. The ----- can be used as a raw material for making Porcelain. 2. JNTUH. 11. The loads on distributors systems are generally (a) balanced (b) unbalanced (c) either of the above (d) none of the above Ans: b 37. 1. . This means testing on insulators is an extremely high priority for knowing how your assets are performing. The energy released by PD may degrade insulation and it can be used as diagnostic signals. Answer & Solution. The dielectric material has only some electrons in normal operating condition. HV circuit breakers have insulation more than: (A) 10Mega ohm (B) 100 Mega ohm (C) 100 ohm (D) 50 ohm. Disruptive corona begins in smooth cylindrical conductors in air at NTP if the electric field intensity at the conductor surface goes up to. cables with various types of insulation materials, the above mentioned cables are most commonly used. 30. Copper B. Ans: (d) 12. Transformers. 2. (D) 10 MVA. The material generally used for armour of high voltage cables is (a) copper (b) brass (c) aluminium Power Electronics mcq power electronics multiple choice questions - 1. October 20, 2020 by Admin. The most commonly used insulating materials for low and medium voltage cables is . The material generally used for armor of high voltage cables is (a) aluminium (b) steel (c) brass (d) copper . (A) 100 KVA. The material generally used for armour of high voltage cables is a) Aluminium b) Steel c) Brass d) Copper. The range of output watt for resistor type induction motor is 7.5-370 and that of the shaded pole type is 0.37-50. The principal insulating materials used in cables are rubber, vulcanized India rubber, impregnated paper, The paper and press-boards are used for winding and cable conductor insulation, primary dielectrics in capacitors, backing for mica insulation, slot insulation of electrical machines, transformer insulation, etc. Answer .2. A cable is an insulation covered conductor. High voltage (1900/3300 and Summary of Materials Used in the Cable Construction 065 Products. View Answer. The operating voltage of extra high tension cables is upto. The results obtained from IR Test are not intended The material commonly used for insulation in high voltage cables is. In cables the charging current. D. None of the above. paper. Lead. These short solved questions or quizzes are provided by Gkseries. 77. Oil is in widespread use in part due to its relatively low cost and thermal characteristics. Login with Google MCQ Type Questions and Answers. Example of asbestos paper insulation wrap on high-voltage cable inside an underground cable vault. The main requirements of the insulating materials used for the cable are: High insulation resistance to avoid leakage current High dielectric strength to avoid electrical breakdown of cable Good mechanical properties (tenacity and elasticity). Good tenacity is required in the materials to withstand the mechanical handling of the cables Parabola is defined as the shape assumed by a cable suspended between two support points, when the cable is supporting a uniform horizontal load. A copper cable has a length of 450 m and a cross-sectional area of 4.0 mm2. MCQ in Power Transmission and Distribution Part 2 | REE Board Exam. Property of absorbing moisture from the atmosphere is Solubility Viscosity Porosity Hygroscopicity 32. Natural air cooling is used for transformers of rating up to. D. Insulation may melt due to heating. When there is a dead end of the line or the line or there is the corner or sharp curve, Contact us for engineering and applications development support! Oil. 26. A. Thermal stability; High dielectric strength and insulation resistance Mechanical Cracks, channels, tracks, deforming, etc. voltage withstand test. The insulation resistance of a cable of length 10 km is 1M . Prior to (b) leads the voltage by 90. 4 Intersheath grading of cables use which dielectric. Ans: (C) 5-10 KVA. Neoprene: is polymerized chloro butadiene. Cable Insulation Properties. (b) between 5 and 6. Electrical Cables MCQ Test & Online Quiz: Below is the Electrical Cables MCQ test that checks your basic knowledge of Electrical Cables. The material generally used for armour of high voltage cables is_____? equipment due to high voltage. There is a danger of breakdown of insulation because of formation of voids in the layers of dielectric. As with paper insulation, the control of electric stress fields remains important. The resistance should be measured. (c) high Answer: Option A. Q 21. Several layers of the soft and friable insulation are wrapped around the cable in long, wide strips. What are different insulation materials used in cables for high voltage and medium voltage? Home / Technical Articles / Testing and Commissioning of MV/HV Cables. 8. In AC.S.R. 16. 27. By which of the following systems electric power may be transmitted ? (b) Super tension. 1 and 3 only C. 2 and 3 only 15. Welcome to your Overhead lines. Which of the following insulation is used in cables ? For a length of 100 km of the same cable, what will be the insulation resistance? Login with Facebook. 1. (a) Overhead system(b) Underground system(c) Both (a) and (b)(d) None of the above Ans: c 2 are the conductors, which connect the consumer's terminals to the distribution(a) Distributors(b) Service mains(c) Feeders(d) None of the above Ans: b The underground system cannot be operated above(a) Overhead lines generally use. 26. Answer: maximum at the conductor and minimum at the sheath. d) The combination of (b) and (c). Transmission and Distribution MCQ Objective Questions and Answers Page - 3. C. resistivity of the material on ohm-meters. D none of the above. HDPE Cable Insulation. These are commonly used in power networks up to 33 kV system. Fault location in an HV cable is done by. This means testing on insulators is an extremely high priority for knowing how your assets are performing. (c) of corona loss between conductor and sheath material. High dielectric strength, high mechanical strength, high tensile strength and plasticity, high resistivity and high viscosity at impregnation temperature B.

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