What are the most common insulators used for extremely high voltages?

What are the most common insulators used for extremely  high voltages?
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Answer :

Varnished cambric and oil-impregnated paper.
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Pin type insulators are generally not used for voltages beyond (a) 1 kV (b) 11 kV (c) 22 kV (d) 33 kV

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Last Answer : (d) 33 kV

The voltages across various discs of suspension insulators having identical discs are different due to:

Description : The voltages across various discs of suspension insulators having identical discs are different due to:  (A) Surface leakage currents  (B) Series capacitance of lines  (C) Shunt capacitance to ground  (D) Series and shunt capacitances

Last Answer : The voltages across various discs of suspension insulators having identical discs are different due to: Shunt capacitance to ground 

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Last Answer : The characteristics of the dielectric of a capacitor.

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Description : What three things prevent a CT rotor from turning when voltages are applied to its stator windings?

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Description : What is the relationship between the transmitter and receiver stator voltages when their rotors are in correspondence?

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Description : When a series voltage regulator is used to control output voltages, any increase in the input voltage results in an increase/a decrease (which one) in the resistance of the regulating device.

Last Answer : An increase.

When a series voltage regulator is used to control output voltages, any increase in the input voltage results in an increase/a decrease in the resistance of the regulating device.

Description : When a series voltage regulator is used to control output voltages, any increase in the input voltage results in an increase/a decrease in the resistance of the regulating device.

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Description : If the load requirement consists of both positive and negative voltages, what technique is used in the voltage divider to supply the loads from a single voltage source?

Last Answer : The ground (reference point) is placed in the proper point in the voltage divider so that positive and negative voltages are supplied

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Description : The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Last Answer : Friction clutches.

The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Description : The development of excessive test voltages is avoided by the use of meggers equipped with what device?

Last Answer : Friction clutches

In a three-phase alternator, what is the phase relationship between the individual output voltages?

Description : In a three-phase alternator, what is the phase relationship between the individual output voltages?

Last Answer : Each phase is displaced 120º from the other two

What is the relationship of the voltage at C in figure 3-7 to the voltages at A and B?

Description : What is the relationship of the voltage at C in figure 3-7 to the voltages at A and B?

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What determines the phase relationship between the voltages in a two-phase ac generator?

Description : What determines the phase relationship between the voltages in a two-phase ac generator?

Last Answer : Placement of armature coils.

In single-phase alternators, in order for the voltages induced in all the armature windings to add together for a single output, how must the windings be connected?

Description : In single-phase alternators, in order for the voltages induced in all the armature windings to add together for a single output, how must the windings be connected?

Last Answer : In series.

What type of ranging circuit is most often used with a radar that requires extremely accurate range data?

Description : What type of ranging circuit is most often used with a radar that requires extremely accurate range data?

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In electronic circuits, DC voltages can be positive (+) or negative (-) when measured with respect to the _________. A. printed circuit board 'common' trace B. chassis, console frame or hull 'ground' C. analogue or digital circuitry 'common' bus D. all of the above

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The compounds used as gaseous insulators in high voltage generators is

Description : The compounds used as gaseous insulators in high voltage generators is

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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

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.

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

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.

Dielectric constant will be high in a) Conductors b) Semiconductors c) Insulators d) Superconductors

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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

High voltage transmission lines use (a) suspension insulators (b) pin insulators (c) both (a) and (b) (d) none of the above

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Last Answer : (a) suspension insulators

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

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 : it does not form a closed path for the flow of current

Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Description : Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Last Answer : Whose resistance falls almost to zero at very low temperatures

What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?

Description : What happens insulators when high voltage passes through transmission lines whether it breaks or lose it's insulating property?

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Electrostatic type instruments are mainly used for measurement of: a) Heavy currents b) Low currents c) Low voltages d) High voltages

Description : Electrostatic type instruments are mainly used for measurement of: a) Heavy currents b) Low currents c) Low voltages d) High voltages

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At high discharge rates, nickel-cadmium storage batteries are superior to lead-acid batteries because they __________. A. require fewer cells for the same voltage and less mounting space B. are able to produce higher voltages and do not have to be charged as often C. can be charged and discharged many times without much damage D. have no individual cells to replace at the end of useful life

Description : At high discharge rates, nickel-cadmium storage batteries are superior to lead-acid batteries because they __________. A. require fewer cells for the same voltage and less mounting space B. are able to ... times without much damage D. have no individual cells to replace at the end of useful life

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Nickel-cadmium batteries are superior to lead-acid batteries at high discharge rates because they _______________. A. deliver a large amount of power and can be recharged in a shorter time B. need fewer cells in connected series and less mounting space C. have higher output voltages and require no maintenance D. all of the above

Description : Nickel-cadmium batteries are superior to lead-acid batteries at high discharge rates because they _______________. A. deliver a large amount of power and can be recharged in a shorter time B. need ... less mounting space C. have higher output voltages and require no maintenance D. all of the above

Last Answer : Answer: A

The primary function of an electric motor is to ___________. A. develop torque B. generate high voltages C. produce a magnetic field D. generate high electrical resistance

Description : The primary function of an electric motor is to ___________. A. develop torque B. generate high voltages C. produce a magnetic field D. generate high electrical resistance

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High voltages lead to A. less power loss B. more power loss C. high current D. high resistance

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Measurement of high dc-voltages is usually done by using

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Measurement of high dc-voltages is usually done by using

Description : Measurement of high dc-voltages is usually done by using

Last Answer : electrostatic

Electrostatic voltmeters are particularly suitable for measuring high voltages because the construction...

Description : Electrostatic voltmeters are particularly suitable for measuring high voltages because the construction is simplified due to

Last Answer : Electrostatic voltmeters are particularly suitable for measuring high voltages because the construction is simplified due to Large electrostatic forces.

Why transmission voltages are high?

Description : Why transmission voltages are high?

Last Answer : If current is high then I2R losses will be more .If I2R losses is more then heat generated is more. By heat or increasing temperature resistance will also be increase which will decrease ... voltage we are decreasing current which is advantageous. That's why transmission voltages is high.

which of the following elements are good insulators -General Knowledge

Description : which of the following elements are good insulators -General Knowledge

Last Answer : P and S is an elements are good insulators.

What are the insulators used to make fiber optic cable ?

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.).

What compares insulators ?

Description : What compares insulators ?

Last Answer : Consider the value of the dielectric strength of a substance . Comparisons are made between insulators.

Are napkins insulators?

Description : Are napkins insulators?

Last Answer : Feel Free to Answer

What is more important insulators or conductors?

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.

What is more important conductors or insulators?

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.

Are perspex and polythene conductors r insulators?

Description : Are perspex and polythene conductors r insulators?

Last Answer : ?

What are Liquid insulators and examples?

Description : What are Liquid insulators and examples?

Last Answer : Need answer

What is more important conductors or insulators?

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.

What is more important insulators or conductors?

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.

Are perspex and polythene conductors r insulators?

Description : Are perspex and polythene conductors r insulators?

Last Answer : ?

This group of alumino-silicate minerals is widely used in making electrical insulators (1) Bauxite (2) Chrornite (3) Manganese (4) Mica

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.

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

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