The corona is considerably affected by which of the following ? (a) Size of the conductor (b) Shape of the conductor (c) Surface condition of the conductor (d) All of the above

The corona is considerably affected by which of the following ? (a) Size of the conductor (b) Shape of the conductor (c) Surface condition of the conductor (d) All of the above
by

1 Answer

Answer :

(d) All of the above
by

Related questions

The corona is considerably affected by which of the following ? (a) Size of the conductor (b) Shape of the conductor (c) Surface condition of the conductor (d) All of the above

Description : The corona is considerably affected by which of the following ? (a) Size of the conductor (b) Shape of the conductor (c) Surface condition of the conductor (d) All of the above

Last Answer : (d) All of the above

Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at the line terminals (c) Possibility of better protection for the line due to possible use of higher terminal reactants (d) Improvement of power factor at times of moderate and heavy loads (e) Possibility of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Description : Which of the following is the demerit of a 'constant voltage transmission system' ? (a) Increase of short-circuit current of the system (b) Availability of steady voltage at all loads at ... of carrying increased power for a given conductor size in case of long-distance heavy power transmission

Last Answer : (a) Increase of short-circuit current of the system

If variable part of annual cost on account of interest and depreciation on the capital outlay is equal to the annual cost of electrical energy wasted in the conductors, the total annual cost will be minimum and the corresponding size of conductor will be most economical. This statement is known as (a) Kelvin's law (b) Ohm's law (c) Kirchhoffs law (d) Faraday's law (e) none of the above

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Last Answer : (a) Kelvin's law

The minimum clearance between the ground and a 220 kV line is about (a) 4.3 m (b) 5.5 m (c) 7.0 m (d) 10.5 m

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The material commonly used for sheaths of underground cables is (a) lead (b) rubber (c) copper (d) iron

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The material generally used for armour of high voltage cables is (a) aluminium (b) steel (c) brass (d) copper

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In transmission lines the crossarms are made of (a) copper (b) wood (c) R.C.C. (d) steel

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Last Answer : (d) steel

Overhead lines generally use (a) copper conductors (b) all aluminium conductors (c) A.C.S.R. conductors (d) none of these

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The material commonly used for insulation in high voltage cables is (a) lead (b) paper (c) rubber (d) none of the above

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Distribution lines in India generally use (a) wooden poles (b) R.C.C. poles (c) steel towers (d) none of the above

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Multicore cables generally use (a) square conductors (b) circular conductors (c) rectangular conductors (d) sector-shaped conductors (e) none of the above

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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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The distributors for residential areas are (a) single phase (b) three-phase three wire (c) three-phase four wire (d) none of the above

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Most of the high voltage transmission lines in India are (a) underground (b) overhead (c) either of the above (d) none of the above

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The voltage of the single phase supply to residential consumers is (a) 110 V (b) 210 V (c) 230 V (d) 400 V

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Besides a method of trial and error, which of the following methods is employed for solution of network problems in interconnected system ? (a) Circulating current method (b) Thevenin's theorem (c) Superposition of currents (d) Direct application of Kirehhoffs laws (e) All of the above

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A booster is a (a) series wound generator (b) shunt wound generator (c) synchronous generator (d) none of the above

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Which of the following D.C. distribution system is the simplest and lowest in first cost ? (a) Radial system (b) Ring system (c) Inter-connected system (d) None of the above

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Due to which of the following reasons the cables should not be operated too hot ? (a) The oil may loose its viscosity and it may start drawing off from higher levels (b) Expansion of the oil may cause the sheath to burst (c) Unequal expansion may create voids in the insulation which will lead to ionization (d) The thermal instability may rise due to the rapid increase of dielectric losses with temperature (e) All of the above

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Last Answer : (e) All of the above

Which of the following methods is used for laying of underground cables ? (a) Direct laying (b) Draw-in-system (c) Solid system (d) All of the above

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The operating voltage of extra high tension cables is upto (a) 6.6 kV (b) 11 kV (c) 33 kV (d) 66 kV (e) 132 kV

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The operating voltage of supertension cables is up to (a) 3.3 kV (b) 6.6 kV (c) 11 kV (d) 33 kV

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The operating voltage of high voltage cables is up to (a)l.lkV (b)3.3kV (c)6.6kV (d)llkV

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The square root of the ratio of line impedance and shunt admittance is called the (a) surge impedance of the line (b) conductance of the line (c) regulation of the line (d) none of the above

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The phenomenon qf rise in voltage at the receiving end of the open-circuited or lightly loaded line is called the (a) Seeback effect (b) Ferranti effect (c) Raman effect (d) none of the above

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310 km line is considered as (a) a long line (b) a medium line (c) a short line (d) any of the above

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Which of the following are the constants of the transmission lines ? (a) Resistance (b) Inductance (c) Capacitance (d) All of the above

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The usual spans with R.C.C. poles are (a) 40—50 meters (b) 60—100 meters (c) 80—100 meters (d) 300—500 meters

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Galvanised steel wire is generally used as (a) stay wire (b) earth wire (c) structural components (d) all of the above

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Which of the following materials is not used for transmission and distribution of electrical power ? (a) Copper (b) Aluminium (c) Steel (d) Tungsten

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The wooden poles well impregnated with creosite oil or any preservative compound have life (a) from 2 to 5 years (b) 10 to 15 years (c) 25 to 30 years (d) 60 to 70 years

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Overhead system can be designed for operation up to (a) 11 kV (b) 33 kV (c) 66 kV (d) 400 kV

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The underground system cannot be operated above (a) 440 V (b) 11 kV (c) 33 kV (d) 66 kV

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are the conductors, which connect the consumer's terminals to the distribution (a) Distributors (b) Service mains (c) Feeders (d) None of the above

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By which of the following systems electric power may be transmitted ? (a) Overhead system (b) Underground system (c) Both (a) and (b) (d) None of the above

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Corona loss is less when the shape of conductor is:

Description : Corona loss is less when the shape of conductor is:

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Pick out the wrong statement. (A) Lead can creep under its own weight at room temperature (B) The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement (C) Recrystallisation temperature decreases with decrease in strain in a cold worked metal (D) With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase

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The infiltration capacity during rain storm, is considerably reduced due to (A) Surface detention (B) Soil moisture (C) Compaction due to rain (D) All the above

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Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction (A) Decreases with decrease of thickness of the flakes(B) Increases with the increasing flake size keeping the flake thicknessconstant(C) Increases considerably with the rise of temperature(D) Decreases as the moisture content of flakes increases

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Solid type cables are considered unreliable beyond 66 kV because (a) insulation may melt due to higher temperature (b) skin effect dominates on the conductor (c) of corona loss between conductor and sheath material (d) there is a danger of breakdown of insulation due to the presence of voids

Description : Solid type cables are considered unreliable beyond 66 kV because (a) insulation may melt due to higher temperature (b) skin effect dominates on the conductor (c) of corona loss between conductor and sheath material (d) there is a danger of breakdown of insulation due to the presence of voids

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An electrical discharge ionizing the air around a conductor is called: w) Flux x) Corona y) Ozone z) Field

Description : An electrical discharge ionizing the air around a conductor is called: w) Flux x) Corona y) Ozone z) Field

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How many people are affected by Corona in Bangladesh ?

Description : How many people are affected by Corona in Bangladesh ?

Last Answer : The number of coronaviruses in Bangladesh is 164. And 18 deaths. Information ATN NEWS

How many people in the world are affected by Corona ? Don't

Description : How many people in the world are affected by Corona ? Don't

Last Answer : In the present world, the number of people affected by corona is 13 , 49 , 264 people. Information ATN NEWS . The number of infected people is also increasing with time. Thank you!

How are you affected by the Corona Virus Financially?

Description : How are you affected by the Corona Virus Financially?

Last Answer : The pandemic caused a lot of financial disposition to me. As I had to stay at home the whole year without pay since I worked in a school. I depleted all my savings, opening this year I was laid off ... being at home with kids, bills to pay with no employment. But I hope all shall be well soon.

The settlement of a particle in sedimentation tank, is affected by A. Velocity of flow B. Viscosity of water C. Size and shape of solid D. All the above

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The run off is affected by (A) Size of the basin (B) Shape of the basin (C) Elevation of the water shed (D) All the above

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If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the (A) Pressure (B) Temperature (C) Both (A) & (B) (D) Neither (A) nor (B)

Description : If the catalyst pore size is small in comparison with the mean free path, collisions with the pore wall controls the process'. The diffusivity under this condition is called 'Knudsen diffusivity', which is affected by the (A) Pressure (B) Temperature (C) Both (A) & (B) (D) Neither (A) nor (B)

Last Answer : (B) Temperature

How common is it to be hired for a part time job described as a certain number of hours but then scheduled for considerably more?

Description : How common is it to be hired for a part time job described as a certain number of hours but then scheduled for considerably more?

Last Answer : I’m not sure how common it is, but it happened to one of my daughters, too. It may be a seasonal issue that will ease after the new year, but I’d definitely talk to the boss about it!

Is it possible that countries without freedom of speech hold considerably worse views about race, homosexuals, etc than the U.S.?

Description : Is it possible that countries without freedom of speech hold considerably worse views about race, homosexuals, etc than the U.S.?

Last Answer : I look at it as, there are few things that are impossible, therefore, all of the above suggestions are possible.

What event(s) in your life matured you considerably in one fell swoop?

Description : What event(s) in your life matured you considerably in one fell swoop?

Last Answer : When I was transferred from public to private school. There was impossible standards at that school. Their graduation requirements were twice that of the state's. It really pushed me to became more ... Then there were the deaths in my family, which obviously caused a growth spurt in my maturity.