A. heat conductivity (c) nonlinear dependence of the charge on the applied voltage. (b) diamagnetic. (b) Rochelle salt. Liquids are generally used as insulating materials up to voltage stresses of about, 6. Here, we systematically studied the effect of surface functionalization of TiO2 and BaTiO3 NPs to enhance the dielectric permittivity of polyvinylidene fluoride (PVDF) NCs by 23 and 74%, respectively, … Which soil has the least specific resistance ? WebAnswer: Option A. Q 7. (d) remains unchanged. 23. electrical appliances ? 43. Multiple Choice B. high relative permittivity (d) none of the above. Questions and Answers as PDF files and eBooks. is no alignment of dipoles in the absence of magnetic field. Direct transmission matrix. (d) none of these, (a) ferrimagnetic Boosters & Ring distributor of Electrical Power - MCQs with ... DC Distribution Calculations of Electrical Power - MCQs with... Distribution System of Electrical Power - MCQs with Answers, Dielectric Stress in a Single Core Cable - MCQs with Answers, Insulation Resistance and Capacitance - MCQs with Answers, Insulation & Insulating materials - MCQs with Answers, Power Systems - Switchgear and Protection, Power Systems - Electrical Power Generation. WebThe electric breakdown strength of insulating materials depends on a variety of parameters, such as pressure, temperature, humidity, field configurations, nature of applied voltage, imperfections in dielectric materials, material of electrodes, and surface conditions of electrodes, etc. This tends to couple with the electrical stress, thus reducing the dielectric strength as temperature increases. toolsplusjobs D. Titanite, 4. Parallel pin electrodes were used in oil. function of the product of gas pressure and distance between the electrodes. You don't need to login to post your comment. Unilateral network Bilateral network This Website is made For Electrical Engineering Student Who are Preparing For Electrical Engineering competitive Exam and Electrical Interviews and For All Types Of Electrical Engineering Exams-You Can Get Fully Explained MCQS for This Website II PGVCL II GETCO II DGVCL II UGVCL II MGVCL II GUVNL II, Our website uses cookies to improve your experience. How do you calculate dielectric breakdown voltage? The impurity in liquid dielectric which has significant effect in C. mica A. polyvinyl chloride The material should also be less affected by temperature … (a) 5 ohms (b) intensity of electric field. Jan 1997. WebThe breakdown strength attracted major interest in early polymer studies. Which of the following statement about corona is Magnetization has its origin in circulating current. C increase in spacing between phase conductors. Webdoes redmi note 10s have video stabilization; detailed lesson plan in english grade 4 verbs pdf; vnc viewer failed to get server address; s4r element abaqus When the electric strength is increased beyond a particular value, it results in breakdown. (d) Neither 1 nor 2. (c) low. A good dielectric should have all the following properties EXCEPT, (B) high resistance to thermal deterioration, 9. (a) 1 only. (b) ferrimagnetic Electric strength in a cable is more on 10. C It is an organic material The electrical breakdown strength of insulating materials depends on (A) nature of applied voltage (B) imperfections in dielectric material (C) pressure, temperature and … 250+ TOP MCQs … D. positive and dependent of temperature, 16. B. dielectric constant The solenoid dipole is represented by an infinitesimal current – loop. (c) becomes double (a) 5 kV/mm Evidence of strong correlation between space-charge buildup and breakdown in cable insulation. (c) the capacitances of insulated conductors Webmicrosoft office professional plus 2016 product key 2022. prey 2022 123movies. ----------------- class of ceramics is used in carrier body covers for ICs and resistors, heat shields etc. normally given as, A good dielectric should have all the following properties EXCEPT, The variety of paper used for insulation purpose is. 5. (a) 1, 2 and 3 only. (c) 3 only. (c) can be used in congested areas The magnetization is entirely solenoidal and divergent. 31.A A. positive and independent of temperature Electro-mechanical breakdown of solid insulating materials occurs due to. The higher the value of tan delta is, the more the Dielectric Loss is likely to be. ITAR Compliant Which of the following gas has been used as insulating medium in electrical appliances ? Nigel Hampton. C. 30 kV IEEE T DIELECT EL IN. 33. Which soil has the maximum specific resistance ? Vacuum insulation is used in all of the following EXCEPT, Liquids are generally used as insulating materials up to voltage gas EXCEPT, (B) increased capacitive reactance of transmission lines, 16.C ----- (d) no dipoles. As per the Chegg guidelines I have given solution of the 1st question only. (d) very much higher than, (a) hard (d) none of these. Practicing these interview questions, you can easily crack any Competitive Exams interview. Four conditions are postulated in the literature.1 At short times, such as impulse, the breakdown value is the intrinsic electric strength. Electro-mechanical breakdown of solid insulating materials occurs B. minimum (a) conductors. B. Phlogopite (d) Wrought iron. WebSwitching surge is. (a) 1 and 3. Regions of high electrical stress can cause nearby gas to partially ionize and begin conducting. It means if the voltage applied across 1mm thick sheet of mica becomes 80kV mica will lose its insulating properties and current will start passing through mica sheet. (a) low cost (a) oil filled High voltage ac. The Insulators need ________ energy to shift electrons from valance band to conduction band in comparison to conductors, superconductors and semiconductors. Web03․. (d) for all of the above reasons. than, 2. (d) all of the above. Beyond breakdown voltage, dielectrics become … D. 50 kV, 27. This rese per unit area to deformation, is called- (a) strain (b) stress (c) pressure (d) modulus of elasticity (d) polar, (a) critical D. 1015 to 1017 ohm-m, 6. In solenoid magnetization is due to a surface current distribution. Your email address will not be published. The table below (figure 4) includes a comparison of dielectric strength values per the NEMA Standard Authorization Engineering Information for several common grades of rigid insulation material: Of course, these NEMA Standard values for dielectric strength are minimum values to meet that standard. The maximum potential gradient that an insulating material or dielectric can withstand without its mechanical breakdown is called its dielectric strength. (d) all of the above. C. Paper Insulation. (a) hysteresis losses only frequency applications EXCEPT. (c) 15 kV/mm However, once the matrix begins to break down thermally around 700 hours, the dielectric strength also drops dramatically. (d) hysteresis, leakage, copper and friction losses. 12. The electrical breakdown strength of insulating materials depends B both diversity factor and load factor increase, D both diversity factor and load factor decrese, Answer: B both diversity factor and load factor increase, D resonance does not depend on line compensation, Answer:B Capacitive effect of transmission line, Answer: C efficiency by reducing corona loss, Answer: A asymmetrical layer of ice formation, Surge impedance is independent of length of the, A For a short distance it is economical over, B In HVDC system, harmonics are not generated, C Use of HVDC can improve system stability. Web250+ TOP MCQs on Insulating Materials and Answers Design of Electrical Machines Multiple Choice Questions on “Insulating Materials”. The alternating current (AC) breakdown … ----- 39.C ----- 40.B -----41.D ----- 42.B -----43.D -----44.B ----- 45.C, “  Nerathai venakkum (b) 3 and 4. Ans: a. Output matrix. (c) provide proper stress distribution (c) provide proper insulation (d) leads the voltage by 180oC. For the breakdown voltage test, ASTM D-149 was also used following Method B, Step-by-Step. (c) both permanent and induced dipoles. (d) absolute, (a) insulating (a) steel tape B. for equipment working at high temperature It is defined as “the maximum electric field strength that a material can withstand intrinsically without breaking down; i.e., without experiencing failure of its insulating properties.”. measurement of high dc voltages ? WebPolyamide resins contain an amide group as a recurring part of their molecular chains. This is called creepage failure. O d. State matrix. (b) bedding (c) none of the above. (b) vulcanized rubber (F is force exerted on a charge q in the electric field E and S is the (b) high resistivity (b) 10 kV/mm With increase in the amount of impurities, the breakdown voltage reduces. Method A is most commonly used for quality control tests, while Method B is commonly used when different materials are compared. WebElectric strength of solid insulation under ac stress depends on time of exposure at a given stress level. D.  all of these, 18.Sometimes varnish is coated on hard porous insulating materials. Which of the following statement about corona is Uploaded By saeedanwar95. (c) armouring C. 30 kV /mm Liquids are generally used as insulating materials up to voltage B. crystalline structure (d) rubber insulated (b) make it flexible C.  Marble B. Steatite D. 1.5 kV /mm, 12.An exposure of insulating material to moisture, causes increase in 7. Using the NACE formula the test voltage is: We know the dielectric strength is 8,400V/mm so for 2mm the maximum voltage before breakdown occurs is 2 x 8,400 = 16,800V. The phenomenon of corona is generally accompanied by, In Van de Graaff generators output voltage is controlled by, Insulators for high voltage applications are tested for, Impulse testing of transformers is done to determine the ability Method B and C results are comparable to each other. Your email address will not be published. The types of materials used for edible packaging include lipids, proteins and polysaccharides or a combination of any two or all of these. As per IE Rule, In the case of low or medium voltage, As per IS 12640:1988, Supply variation will become. We will provide you the secure enterprise solutions with integrated backend systems. (d) resistors. (c) Ferroelectric. WebThe ASTM standard test method for dielectric breakdown voltage and dielectric strength of solid electrical insulating materials at commercial power frequencies is D-149. (b) the decrease in the length of the insulation Which of the following technique/method is-used for the (c) none of the above. D. low relative permittivity, 24. (b) Ferroelectric materials only. Nov 18 2022 08:12 AM … (c) hysteresis and eddy currents. 10 kV /mm Thus, manufacturing quality has an important impact on material performance. (b) 2 and 3. The essential condition for the Paschen's law to be valid is that, 38. High Voltage Engineering - Electrical Engineering (MCQ) questions and answers. (a) 1 and 4. Web250+ TOP MCQs on High Conductivity Materials and Answers. These mechanisms mainly include: • Thermal … They have a low friction coef (c) between 8 and 10 (d) 200 kV/mm . D. none of above, 25. Cotton Insulation. (c) 60 ohms An Insulator is defined as a material having resistivity- roughly in the range -------- . (c) antiferromagnetic Insulation used in commutator is Paramagnetic substances have very small positive values of susceptibility. (c) spontaneous polarization. The materials have negative magnetic susceptibility. (a) large saturation magnetization. 20 related questions found. If the applied electric field is sufficiently high, free electrons may become accelerated to velocities that can liberate additional electrons during collisions with neutral atoms or molecules in a process called avalanche breakdown. 8. measurements of ac high frequency voltages ? (a) only expand. Ferromagnetic substances have very large negative values of susceptibility. Method A, Short-Time Test – Apply voltage uniformly to the test electrodes from zero to one at a specific rate until breakdown occurs. Which of the following method or technique can be used for the Value). B. (b) bedding WebThe electrical breakdown strength of insulating materials depends on A. nature of applied voltage B. imperfections in dielectric material C. pressure, temperature and … (a) High dielectric constant. (c) any of the above Management Consulting Company. (b) dielectric breakdown. A failure through the insulation thickness is called a puncture failure. For solid materials, a breakdown event severely degrades or even destroys its insulating capability. (c) 30 kV/mm So, you need to check all the questions in the High Voltage Electrical Engineering MCQ Quiz to prepare for the exams. closed surface containing charge q, D is the flux density). (c) high melting point. A. Paraffin wax. b. The breakdown mechanism probably varies with time. (a) Bedding (c) Extra high tension reducing the breakdown strength, is, 7. (b) positive Since dielectric breakdown occurs as the acceleration of electrons within the insulating medium increases, the thermal loading of the insulation must also be considered. Apr 13, 2022. magnetic bum. (b) working temperature A . (a) paramagnetic substance. Article. How do you calculate dielectric breakdown voltage? 9. If the point is now enclosed by a perfectly conducting sheet sphere at the point P. Outside the sphere, becomes 0 μVm 100 μVm -100 μVm 50 μVm Answer 19. Pages 106 Ratings 100% (1) 1 out of 1 … B. electrical stress (a) ferromagnetic However when a large enough electric field is applied to any insulating substance, at a certain field strength the concentration of charge carriers in the material suddenly increases by many orders of magnitude, so its resistance drops and it becomes a conductor. This is called electrical breakdown. (c) 3 to 5 mm Because dielectric materials usually contain minute defects, the practical dielectric strength will be a fraction of the intrinsic dielectric strength seen for ideal, defect-free material. B. Line insulators are made of 17.B ----- 18.C ----- 19.B ----- 20.D ----- 21.B ----- 22.D ----- 23.C General ONLINE MCQ EE. The insulating material for a cable should have ______ C. mechanical strength of, Transformers contribute to radio interference due to, As compared to air the relative dielectric strength of sulphur The insulating material for cable should have (a) low cost (b) high dielectric strength (c) high mechanical strength (d) all of the above. Temperature With increase in temperature, breakdown voltage reduces due to increase in thermal energy. Power Systems - Transmission & Distribution of Electrical Power. A. Alumina (c) voltage (c) expand first and then rotate. … measurement of high ac voltages EXCEPT, The essential condition for the Paschen's law to be valid is that, The breakdown voltage in gases depends on, At unvarying temperature breakdown voltage in a uniform field is a incorrect ? (d) antiferromagnetic, (a) less than (b) diamagnetic Insulators for high voltage applications are tested for, 19. CEO Electro-mechanical breakdown of solid insulating materials occurs due to Apr 13, 2022 magnetic bum vibrations mechanical stresses produced by the electrical field electrical stresses produced by the voltage fluctuations Answer is "mechanical stresses produced by the electrical field" You don't need to login to post your comment … (b) low cost A. III. A. (b) Paramagnetic. WebTest Set - 1 - High Voltage Engineering - The test carries questions on topics such as Conduction and breakdown in gases & liquid dielectrics, breakdown in solid dielectrics, … Answer: C Use of HVDC can improve system stability, (I) To regulate interstate transmission of electricity, (II) Promotion of investment in electricity industry, (111) To determine tariff for interstate electricity transmission, A generating station to a switching station/stepdown transformer station, B stepdwon transformer station to service transformer banks, C distribution transformer to consumer peremises, Answer: A generating station to a switching station/stepdown transformer station. WebBreakdown Voltage Test or Di-electric Strength Test of Insulating Oil. B. high dielectric strength Impulse testing of transformers is done to determine the ability (b) galvanized steel wire The dielectric strength of transformer oil should not be less than In this High Voltage Electrical Engineering Questions and Answers section you can learn and practice High Voltage Electrical Engineering Questions and Answers to improve your skills in order to face technical inerview conducted by Organisations. (a) the resistance of the conductor Large capacity generators are manufactured to generate power at. Insulators are required to withstand (A) Corona gives 22. (b) 2 and 4. The test condition indicates that the electrodes were perpendicular to the thickness of the 1/16” thick material, and the test was done in dielectric oil. (a) frequency of applied voltage. What is Lighting arrester ? Please repost the remaining to get their solutions. Each material is a 220°C rated, high-temperature glass polyester laminate commonly used in dry-type transformer applications for components such as winding combs. TLB is a. Cache Memory used DOS mode O b. Cache Memory with Two Layers L1 and L2 O c. Cache Memory used in Paging O d. Cache Memory using to speedup hard-disk If more resistors are added in a series circuit resistance will be O a decreased b. constant c. equal Od increased How many wires do we need to connect a 4X4 keypad to microcontrollers? Dielectric Loss is measured using the Loss of tangent which is also commonly referred to as tan delta (tan δ). All students, freshers can download High Voltage Electrical Engineering An insulator three times as thick has a dielectric strength slightly less than 3 times as much. We will update the questions related to the High Voltage Electrical Engineering on this page. B. power factor Dielectrics are no exception to this rule. Thus, you will get a brief idea about the High Voltage Electrical Engineering multiple choice questions by referring to this article. (d) spontaneous magnetization. (b) produces large hysteresis. (b) paper insulated Which of the following gas has been used as insulating medium in C. negative and dependent of temperature (d) absence of harmonics D. 3500 kV/mm, 7. rise to radio interference, (B) Corona D.  It is highly inflammable. 2. We offer an extensive range of e-commerce website design and e-commerce web development solutions in the form of e-commerce payment gateway integration, shopping cart software, custom application development, Internet marketing, e-Payment to companies across the globe. Dielectric strength is the measure of the ability of an insulating material to withstand an … (b) 2 only. In addition, The Gund Company offers materials engineering presentations and training seminars for our customers to help them understand a wide range of modern material properties and capabilities. The below list provides all the multiple-choice questions related to engineering materials. C. voltage D. current carrying capacity, 30.PVC stands for _______. hexafluoride is nearly, The electrical breakdown strength of insulating materials depends It has high dielectric strength. Surge voltage originate in power systems due to, 4. This test method is similar to IEC Publication243-1, with differences between D-149 and IEC 243-1 being mostly editorial. C. grain oriented crystalline structure of, (B) insulation to withstand transient voltages, (C) windings to withstand voltage fluctuations, 20. A. maximum Surge voltage originate in power systems due to, 29. (a) ferroelectric. Asbestos cloth is used for--- Short duration transient voltage. Drain oil from transformer and other equipment. B.  ionic After 300 hours of aging at 270°C, the dielectric strength remains unchanged. Most commonly, the test voltage is applied using simple test electrodes on opposite faces of specimens. Alumina C. weak mechanical strength Most manufacturers far exceed the minimum standard, as evidenced in the table showing dielectric strength properties for NEMA GPO-3 (Figure 3). (d) Neel temperature. C.  zero The basic materials selected for insulation systems are selected based on their ability to withstand varied electrical, mechanical, and thermal stresses during … These properties should limit some short-term breakdown mechanisms, distinguished in three main types: (i) Electrical breakdown: this is a very fast mechanism which is not preceded by any increase of the … D. glass, 10. (c) conductor surface Asbestos has --------- . (c) Curie A. (b) power factor B. proportional to applied voltage. B. moisture content WebThe property which attributes to such type of break down is called the dielectric strength. Copper as conductor for cables is used as (A) Annealed (B) Hardened and tempered (C) Hard drawn (D) Alloy with chromium The electric breakdown strength of insulating materials depends on A Nature of applied voltage B Imperfection of dielectric material C Pressure, temperature … (d) none of the above. A. (b) brittle WebMCQ Questions on Electrical Cable 1. AllIndiaExams provides you lots High Voltage Electrical Engineering Questions and Answers with proper explanation. (c) produces low eddy currents. (b) rotate first and then expand. (d) lead sheath. (c) ferromagnetic. All Right Reserved © 2014 Total IT Software Solutions Pvt. 32. D. Micanite. B. hexafluoride is nearly, 22. (c) high mechanical strength 8. Questions of High Voltage Engineering (31-45): 31. A. reactive power WebThe power dissipated in a pure capacitor is. (a) insulation may melt due to higher temperature. Using the NACE formula the test voltage is: We know the dielectric strength is 8,400V/mm so for 2mm the maximum voltage before breakdown occurs is 2 x 8,400 = 16,800V. 04․. B. dielectric strength 09, 2018 • 16 likes • 11,335 views Download Now Download to read offline Engineering High Voltage Engineering (Electrical Engineering) MUET SZAB Campus Khairpur Mir's Sindh Pakistan Follow Advertisement Recommended Dielectrics parth98796 8.2k views • 32 slides … Earlier it was 6% in the case of low or medium voltage. A. sleeves of heating devices The insulator should have (c) Piezoelectricity. WebThe insulating material used for cables should have all of the following except A. (d) none of the above. D increase in load current carried by conductors. (a) insulation layer The electrical … This is the electrical engineering questions and answers section on "High Voltage Engineering" with explanation for various interview, competitive examination and entrance test. Jacques Lewiner. Which of the following method or technique can be used for the (a) to minimize temperature stresses … (d) neither rotate nor expand. (c) ferromagnetic Experts are tested by Chegg as specialists in their subject area. Dielectric strength in case of mica can be expected to be more than They are easily molded, strong and resistant, and lightweight. A.  MgO Experimentally, this highest dielectric strength can be obtained only under the best experimental conditions when all extraneous influences have been … (d) ferrimagnetic, (a) diamagnetic WebThe electrical breakdown strength of insulating materials depends on (A) nature of applied voltage (B) imperfections in dielectric material (C) pressure, temperature and … The dielectric loss increase with temperature. (b) 2, 3 and 4 only. Three different types of insulating fluids such as natural ester, mineral oil and natural ester mixed with Fe 3 O 4 nanoparticles were explored for their AC breakdown strengths and it was shown that natural ester mixed with Fe 3 O 4 nanoparticles has better breakdown strength compared with mineral oil and natural ester . The breakdown voltage in gases depends on (A) distance between the electrodes (B) relative air density (C) humidity (D) all of the above.
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