Hollow conductors are used in the transmission lines to: 

(1) Improve heat dissipation (2) Reduce corona loss (3) Reduce skin effect (4) Reduce the line inductance

1 Answer

Answer :

Hollow conductors are used in the transmission lines to: Reduce corona loss.

Related questions

Description : Bundled conductors are mainly used in high voltage overhead transmission lines to (a) Reduce line loss (c) Reduce corona (b) Reduce harmonics (d) Increase strength

Last Answer : Bundled conductors are mainly used in high voltage overhead transmission lines to Reduce corona 

Last Answer : Copper conductors are generally used for transmission lines because it has longer life and high conductivity.

Description : ACSR (Aluminium Conductor Steel Reinforced) are used as (A) over head transmission lines. (B) super conductors. (C) fuse (D) underground cables.

Last Answer : (A) over head transmission lines.

Description : In direct cooled system using hydrogen both stator and rotor conductors are made (a) solid (b) hollow (c) perforated (d) any ofthe above

Last Answer : (b) hollow

Description : Corona loss can be reduced by the use of hollow conductors because?

Last Answer : Corona loss can be reduced by the use of hollow conductors because of better ventilation in the conductor.

Description : Transmission tissue is characteristic feature of (a) dry stigma (b) wet stigma (c) hollow style (d) solid style

Last Answer : (d) solid style.

Description : Transmission tissue is characteristic feature of:a) Solid style b) Dry stigma c) Wet stigmad) Hollow style

Last Answer : a) Solid style

Description : If the operating frequency is 450 MHz what length of a pair of conductors is considered to be a transmission line? A. 2.19 ft B. 2.19 m C. 0.219 ft D. 0.219 m

Last Answer : C. 0.219 ft

Description : A pair of current-carrying conductors is not considered a transmission line unless it is at least ___ λ long at the signal frequency. A. 0.1 B. 0.3 C. 0.2 D. 0.4

Last Answer : A. 0.1

Description : A transmission line consisting of two conductors that have equal resistance per unit length. A. Unbalanced line B. Open-wire line C. Balanced line D. Coaxial line

Last Answer : C. Balanced line

Description : The two conductors of a transmission line carry equal current I in opposite directions. The force on each conductor is (a) proportional to 7 (b) proportional to X (c) proportional to distance between the conductors (d) inversely proportional to I

Last Answer : (b) proportional to X

Description : In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required?

Last Answer : In case of a ‘High Voltage DC’ transmission, how many minimum conductors are required? one

Description : Galloping in transmission line conductors arises generally due to - (A) asymmetrical layer of ice formation (B) vortex phenomenon in light winds (C) heavy weight of line conductors (D) adoption of horizontal conductor

Last Answer : D

Description : A three phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to 'd'. if now the conductors of the line are rearranged to form and the equilateral triangle of sides equal to 'd' then?

Last Answer : A three-phase overhead transmission line has its conductors horizontally spaced with spacing between adjacent conductors equal to 'd'. if now the conductors of the line are rearranged to form and an equilateral triangle of sides equal to 'd' then average capacitance and inductance will increase.

Description : Different components of the motherboard of a PC unit are linked together by sets of parallel electrical conducting lines. What are these lines called? A) Conductors B) Buses C) Connectors D) Consecutives

Last Answer : Answer : B

Description : Different components on the motherboard of a PC processor unit are linked together by sets or parallel electrical conducting lines. What are these lines called? a. Conductors b. Buses c. Connectors d. Connectively

Last Answer : Buses

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

Last Answer : (c) A.C.S.R. conductors

Description : What happens to the H lines between the conductors of a coil when the conductors are close together?

Last Answer : The H lines cancel.

Description : Different components on the motherboard of a PC processor unit are linked together by sets or parallel electrical conducting lines. What are these lines called? a. Conductors b. Buses c. Connectors d. Connectively

Last Answer : b. Buses

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 : Why are overhead transmission lines not insulated?

Last Answer : Insulators are useful to help separate electrical conductors when they come into physical contact. Overhead Transmission Lines Are Not Insulated: The overhead transmission line is carrying extreme high voltage and ... a whole lot of thick insulation to absorb the heat produced by such high voltage.

Description : What type of earthing is used by transmission lines?

Last Answer : Preventive  multiple  earthing  PME.

Description : The main limitation for power handling capability of short length transmission lines and cables is (A) power factor (B) stability (C) thermal effect limit (D) conductor size

Last Answer : The main limitation for power handling capability of short length transmission lines and cables is thermal effect limit

Description : Bulk power transmission over long HVDC lines is preferred because of

Last Answer : Bulk power transmission over long HVDC lines is preferred because of Low cost of HVDC terminal

Description : Transmission lines are transposed to : (A) Reduce copper loss (B) Reduce skin effect (C) Prevent interference with neighbouring telephone lines (D) Prevent short-circuit between any two lines

Last Answer : a

Description :  Transmission lines connect: -  a) Generating station to a switching station / step down transformer station b) Step down transformer station to service transformer banks c) Distribution transformer to consumer premises d) Service points to consumer premises

Last Answer :  Transmission lines connect: - Generating station to a switching station / step down transformer station 

Last Answer : The transmission lines which feed different sub-stations represent primary distribution.

Last Answer : On the basis of distance from generating station to distributers

Last Answer : Transmission lines use high voltage to reduce the amount of power loss over long distance. This power loss can come from large current running through the cable due to the resistance of the cable conductor. Stepping up the voltage reduces the amount of current through transmission lines.

Description : The electric field inside a hollow conducting sphere ________ A) Depends on the diameter of the sphere  B) Varies according to the direction of earth’s magnetic poles C) Is zero  D) None of these

Last Answer : The electric field inside a hollow conducting sphere Is zero

Description : If a positively charged body is placed inside a spherical hollow conductor, what will be the polarity of charge inside and outside the hollow conductor ? (a) Inside positive, outside negative (b) Inside negative, outside positive (c) Both negative (d) Both positive

Last Answer : The polarity of the charge will positive

Description : advantage and disadvantages of stranded conductors. 

Last Answer : Advantage and disadvantages of stranded conductors  Advantages of Stranded Conductors:-  1. Conductor becomes flexible.  2. Its weight reduces.  3. Easy for handling.  4. Easy to ... Stranded Conductors:-  1. Due to stranding of conductor its resistance increases slightly about 2%. 

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 statements is not valid in case of conductors in electrostatic fields? A) The static electric field intensity inside a conductor is zero B) The static electric field intensity at ... the surface C) The conductor surface is an equivalent potential surface D) None of the above

Last Answer : Which of the following statements is not valid in case of conductors in electrostatic fields? A) The static electric field intensity inside a conductor is zero B) The static electric field intensity at ... the surface C) The conductor surface is an equivalent potential surface D) None of the above

Description : Two parallel conductors are separated by a distance, d carrying a current, I in the same direction. The magnetic field along a line running parallel to the conductors and midway between them is (A) zero (B) proportional to I (C) proportional to d (D) proportional to the permeability of the medium. 

Last Answer : The  magnetic  field  along  the conductor at  the  midway point  is  zero  because  equal  magnitide  of  field  are produced  in  each conductor   therefore  the  resultant  magnetic field  at  the  midway  is  zero.

Description : Consider the following statements associated with the basic electrostatic properties of ideal conductors :  1. The resultant field inside is zero. 2. The net charge density in the interior is zero. 3. Any net charges reside on the ... (b) 3, 4 and 5 only (c) 1, 2 and 3 only (d) 2 and 3 only

Last Answer : Consider the following statements associated with the basic electrostatic properties of ideal conductors : 1. The resultant field inside is zero. 2. The net charge density in the interior is zero. 3. Any net charges reside on the ... (b) 3, 4 and 5 only (c) 1, 2 and 3 only (d) 2 and 3 only

Last Answer : The number of conductors of the compensating winding in a D.C. machine is always less than the number of armature conductors per pole.

Description : Two aluminium conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 100 ohms the resistance of other conductor will be 

Last Answer : Two aluminium conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 100 ohms the resistance of other conductor will be 25 ohms.

Description : What are the building restrictions concerning power/transmission lines?

Last Answer : There is none in North Carolina—- They just put in a transmission line right down the road with houses at 75 foot set-back from road on both sides of the road. The towers are taller than the driveways are long!

Description : Which of the following is not a transmission medium? (a) Telephone lines (b) Co_axial cable (c) Modem (d) Microwave system -Technology

Last Answer : (c) All are communication channel but modem is a dev that convert analog signals to digital signals or vice-versa

Description : How much labor time to replace transmission cooler lines on Detroit series 60?

Last Answer : Need answer

Description : The leakage current in the transmission lines is referred to as the a) Resistance b) Radiation c) Conductance d) Polarisation

Last Answer : Ans: C

Description : What are the different relays that employed for protection of apparatus and transmission lines?

Last Answer : Answer: The relays that are usually employed for protection of transmission lines include • Over current relay • Directional relay • Distance relay • Under Voltage relay • Under-frequency relay • Thermal relay • Differential relay • Phase sequence relays • pilot relays

Description : Why Earth Wire is provided in the overhead transmission lines?

Last Answer : Earth wire is provided above the overhead transmission lines for protection against lightning strokes. The ground wire or earth wire protects the phase conductors or line conductors by attracting itself the ... traveling waves set in the lines by acting a short circuit secondary of the line current

Description : Why, when birds sit on transmission lines or current wires doesn't get shock?

Last Answer : It's true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock. so ... is grounded..So that means that human who touch the line closes the circuit between phase and neutral.

Description : Man-made noise is usually from _______. A. transmission over power lines and by ground wave B. sky-wave C. space-wave D. troposphere

Last Answer : A. transmission over power lines and by ground wave

Description : The velocity factor in transmission lines vary from ___ to ___. A. 0.6 to 0.8 B. 0.3 to 0.5 C.0.5 to 0.9 D. 0.8 to 0.9

Last Answer : C.0.5 to 0.9

Description : Why, when birds sit on transmission lines or current wires doesn't get shock?

Last Answer : A:Its true that if birds touch the single one line (phase or neutral) they don't get electrical shock... if birds touch 2 lines than the circuit is closed and they get electrical shock.. so if a human ... the air. If he is standing on the ground then touching the line (phase) he will get a shock.

Description : Transmission of printed material over telephone lines. A. Video text B. Facsimile C. Encoding D. Xerox copy

Last Answer : B. Facsimile