Description : What are Liquid insulators and examples?
Last Answer : Need answer
Description : What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?
Last Answer : I think it will breaks when it crosses breakdown voltage .
Description : Compare pin type and suspension insulators on given points: (i) Position of insulator on cross arm. (ii) Position of conductor on insulator. (iii) Reaction on cross arm. (iv) Possibility of ... Replacement cost (vi) Maximum voltage level (vii) Effect on height of supporting structure. (viii) Life
Last Answer : S.No Points Pin Type insulator Suspension or Disc Type insulator 1 Position of insulator on cross arm It is fixed on top of cross arm by using galvanized steel pin. So it is ... so to maintain minimum ground clearance height of pole increase. 8 Life Less More
Description : Which have more free electrons: conductors or insulators?
Last Answer : Conductors have many free electrons whereas insulators have very few or none at all.
Description : Name two good conductors, two good insulators, and two semiconductors.
Last Answer : In general all metals are good conductors, with silver the best and copper second.
Description : which of the following elements are good insulators -General Knowledge
Last Answer : P and S is an elements are good insulators.
Description : What are the insulators used to make fiber optic cable ?
Last Answer : The insulators used to make fiber optic cable are Silicon Dioxide and Muli Component Glass (Soda Boro Silicet , NaOH Silicet etc.).
Description : What compares insulators ?
Last Answer : Consider the value of the dielectric strength of a substance . Comparisons are made between insulators.
Description : The compounds used as gaseous insulators in high voltage generators is
Last Answer : The compounds used as gaseous insulators in high voltage generators is A. `SF_(4)` B. `SF_(6)` C. `SCl_(6)` D. `TeF_(6)`
Description : Are napkins insulators?
Last Answer : Feel Free to Answer
Description : What is more important insulators or conductors?
Last Answer : Both are equally important.Insulators keep the electricity from going where it is notwanted while conductors take electricity where it is wanted.
Description : What is more important conductors or insulators?
Last Answer : Conductors and Insulators. In a conductor, electric current can flow freely, in an insulator it cannot. Metals such as copper typify conductors, while most non-metallic solids are said to be good insulators, having extremely high resistance to the flow of charge through them.
Description : Are perspex and polythene conductors r insulators?
Last Answer : ?
Description : This group of alumino-silicate minerals is widely used in making electrical insulators (1) Bauxite (2) Chrornite (3) Manganese (4) Mica
Last Answer : (4) Mica Explanation: Sheet mica is used principally in the electronic and electrical industries. Its usefulness in these applications is derived from its unique electrical and thermal insulating properties and ... it is a good electrical insulator at the same time as being a good thermal conductor.
Description : Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures
Last Answer : (2) Whose resistance falls almost to zero at very low temperature Explanation: Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in ... lines from the interior of the superconductor as it transitions into the superconducting state.
Description : A bird sitting on a high tension electric wire does not get electrocuted because – (1) it has high resistance (2) the body is earthed (3) it does not form a closed path for the flow of current (4) its feet are good insulators
Last Answer : (3) it does not form a closed path for the flow of current Explanation: Electricity travels from a place of high voltage to low voltage, just as water travels from high elevation to low ... When electricity travels through a body in this fashion, electrocution takes place, and the bird can die.
Description : Which of the listed pairs of materials make the best insulators? A. dry air and a vacuum B. tin and lead C. doped silicon and germanium D. paper and oil
Last Answer : Answer: D
Description : Which of the listed pairs of materials make the best insulators? A. copper and aluminum B. glass and mica C. dry air and a vacuum D. doped silicon and germanium
Last Answer : Answer: B
Description : What are different insulators used in substation
Last Answer : Different Insulators: Over head electrical conductors used for transmitting electric power is mostly bare and not covered with any insulation medium. The bare line conductors are ... Post insulators for support Stray arm insulators Shaft insulators Sectionalising insulators Connecting rod insulators
Description : What are different insulators employed in substations?
Last Answer : Some of the insulators employed in substations are: Pin insulators Post insulators Strain insulators Suspension insulators Hallow apparatus insulators Dead-end insulators Solid core insulators
Description : The metals occuring at the lower most position in the electromotive series (A) Do not resist corrosion (B) Resist corrosion very strongly (C) Are very brittle (D) Are heat insulators
Last Answer : (B) Resist corrosion very strongly
Description : What are insulators? Give example.
Last Answer : Substances that do not allow electric current to pass through them are called insulators. Example: Plastic, rubber, wood, glass etc.
Description : Why insulators are glazed?
Last Answer : If not glazed, it will absorbs water, resistance comes down, leakage current through porcelain, temperature increases till porcelain is puncture
Description : Why disc insulators grooved at bottom?
Last Answer : To increase the creepage distance, reduce the chances of flash over.
Description : The skin effect is a phenomenon observed in a) Insulators b) Dielectrics c) Conductors d) Semiconductors
Last Answer : c) Conductors
Description : Skin depth phenomenon is found in which materials? a) Insulators b) Dielectrics c) Conductors d) Semiconductors
Description : Insulators perform which of the following functions? a) Conduction b) Convection c) Provide electrical insulation d) Allows current leakage at interfaces
Last Answer : c) Provide electrical insulation
Description : Dielectric constant will be high in a) Conductors b) Semiconductors c) Insulators d) Superconductors
Last Answer : c) Insulators
Description : Name three electrical conductors and three electrical insulators.
Last Answer : Ans: conductors: metals, graphite, carbon insulators: glass, rubber, wood
Description : Pick up the incorrect statement from the following: (A) Plastics are chemical resistant (B) Plastics are durable (C) Plastics are ductile (D) Plastics are excellent electric insulators
Last Answer : Answer: Option C
Description : Porcelain is used as: (A) Sanitary wares (B) Electric insulators (C) Storage vessels (D) Reactor chambers
Last Answer : Answer: Option D
Description : Practical method of improving string efficiency a) Increasing crass arms length b) Using different size of insulators c) Using different insulator materials d) Using of guard rings
Last Answer : Ans: Increasing crass arms length*
Description : The substances which have a large number of free electrons and offer a low resistance are called (a) insulators (b) inductors (c) semi-conductors (d) conductors
Last Answer : (d) conductors
Description : High voltage transmission lines use (a) suspension insulators (b) pin insulators (c) both (a) and (b) (d) none of the above
Last Answer : (a) suspension insulators
Description : At very high frequencies, what characteristics are displayed by ordinary insulators?
Last Answer : The characteristics of the dielectric of a capacitor.
Description : What are the most common insulators used for extremely high voltages?
Last Answer : Varnished cambric and oil-impregnated paper.
Description : Light waves can cause photoelectric emission in a) Metals b) Alkali metals c) Insulators d) None of the above
Description : Transistors are made from (a) Plastic (b) metals (c)insulators (d) doped semiconductors
Last Answer : d) doped semiconductors
Description : Substances of conductivity between 10–10 10–20 (n m )–1 are: a) Insulators b) Semiconductors c)Super conductors d)Good conductors
Last Answer : a) Insulators
Description : he substances of conductivity of the order of 10–6 – 10–4 (m)–1 are : a) Insulators b) Super conductors c) Semiconductors d)Good conductors
Last Answer : d)Good conductors
Description : Pin type insulators are generally not used for voltages beyond (a) 1 kV (b) 11 kV (c) 22 kV (d) 33 kV
Last Answer : (d) 33 kV
Description : The use of strain type insulators is made where the conductors are (a) dead ended (b) at intermediate anchor towers (c) any of the above (d) none of the above
Last Answer : (c) any of the above
Description : Which of the following is not a constituent for making porcelain insulators ? (a) Quartz (b) Kaolin (c) Felspar (d) Silica
Last Answer : (d) Silica
Description : Transmission line insulators are made of (a) glass (b) porcelain (c) iron (d) P.V.C.
Last Answer : B
Description : Insulators have (A) A full valence band. (B) An empty conduction band. (C) A large energy gap. (D) All the above.
Last Answer : (C) A large energy gap.
Description : Magnetic materials (A) provide path to magnetic flux. (B) are good insulators. (C) are semiconductors. (D) None.
Last Answer : (A) provide path to magnetic flux.