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what is conductor ?

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The object through which current can pass
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Conductor is the object that helps to pass the current


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Description : What is difference between Conductor and insulator ?

Answer : Conductor is a material that offers no resistance to the flow of current, while an insulator is a material that offers total resistance to the flows of current, It doesn't allowed any flows of current.

Description : What is the difference between a cable and a conductor?

Description : In a metal conductor, what is a free electron?

Answer :  When many atoms are close together in a copper wire, the outermost orbital electron of each copper atom can easily break free from its home or parent atom. These electrons then can migrate easily ... random. Such electrons that can move freely from one atom to the next are called free electrons.

Description : Explain the suitability of aluminium as an electrical conductor with respect to its mechanical and electrical properties. 

Answer : Following are requirements of conductor:- i) High conductivity :  Material should have high conductivity, So that * cross section of conductor (size) reduces, * Copper losses reduces, * So Efficiency ... . Boiling point is 1820°C 9. Specific gravity is 2.7 10. High resistance to corrosion. 

Description : State properties of conductor material used for overhead conductor. 

Answer : Following are the properties of conductor material:-   1. High conductivity :- Material should have high conductivity 2. High mechanical strength:- Material should have sufficiently high mechanical strength ... available & less costly. 9. Scrap Value: - Material should have high scrap value. 

Answer : Which allows the flow electrons 

Description : reasons the transposition of conductor

Answer : Following reasons the transposition of conductor:  1. Due transposition of conductor inductance of each line is same LA = LB = LC, So drop due to inductive reactance in each line is same so ... interferences are less due to transposition.  Figure of transposition of conductor: 

Description : Which is the best conductor: silver, carbon, or iron?

Answer : Silver is the best conductor. Carbon is the semiconductor. Iron have less conductance as compared to silver.

Description : How does the resistance of a conductor compare to that of an insulator?

Answer : The resistance of a conductor can be significantly lower than the resistance of an insulator, depending on each material's atomic properties.

Description : lf the wire which is vertical to this page has electron flow downwards the conductor will have

Answer : lf the wire which is vertical to this page has electron flow downwards the conductor will have a counter-clockwise field in the plane of the paper

Description : A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand?

Answer : A 3 layer, total diameter of an ACSR conductor is 5 cm. Find the diameter of each strand? 1 cm

Description : When electric current passes through a metallic conductor, its temperature rises. This is due to?

Answer : When electric current passes through a metallic conductor, its temperature rises. This is due to collisions between conduction electrons and atoms.

Description : The thickness of insulation provided on the conductor depends on?

Answer : The thickness of insulation provided on the conductor depends on the magnitude of voltage on the conductor.

Description : The insulation on a current carrying conductor is provided?

Answer : The insulation on a current carrying conductor is provided to prevent leakage of current, to prevent shock.

Description : Heat in a conductor is produced on the passage of electric current due to?

Answer : Heat  in  a   conductor  is  produced   due  to  frictional  collision  of  electrons   flow  as  they  conduct  current.

Description : If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes?

Answer : If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes 0.4 ohm.

Description : The resistance of a few meters of wire conductor in closed electrical circuit is?

Answer : The resistance of a few meters of wire conductor in closed electrical circuit is practically zero.

Description : Current velocity through a copper conductor is

Description : The resistance of a conductor varies inversely as?

Answer : The resistance of a conductor varies inversely as area of cross-section.

Answer : If B is the flux density, I the length of conductor and v the velocity of conductor, then induced e.m.f. is given by Blv.

Answer : When a conductor carries more current on the surface as compared to core, it is due to skin effect.

Description : Is Aluminium a good conductor of electricity?

Answer : Yes aluminium is a conductor and it is a good conductor of electricity. But copper have better conductivity as compare to aluminium.

Description : Why ACSR conductor is used for overhead lines?

Answer : It has high tensile strength 

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

Answer : The polarity of the charge will positive

Description : A conductor of diameter d, length 1 consumes a power of W when a current I flows through it. What will be the power consumed if d is doubled, 1 is halved and current is tripled ?

Answer : A conductor of diameter d, length 1 consumes a power of W when a current I flows through it. What will be the power consumed if d is doubled, 1 is halved and current is tripled ?  72 W

Description : A conductor is composed of seven identical copper strands, each having a radius 'R'. Then what is self GMD (Geometric Mean Distance) of the conductor?  (A) 2.645 R (B) 2.177 R (C) 2.141 R (D) 1.21 R 

Answer : Self GMD of the seven strand conductor is 49th root of the distances. ThusDs = [(r')7 × (D²12 × D²26 × D14 × D17)6 × (2)6]1/49= [(0.7788 r)7 × (2²r² × 3 × 2²r² × 2²r × 2r)6]1/49 = 2r[3(0.7788)]1/7 = 2.177 r 61/49

Answer : Copper Silver Platinum Aluminium

Description : what are the examples of poor conductor ?

Answer : carbon and salt water are the examples of poor conductors.

Description : what is the temperature coefficient of Resistance of conductor ?

Answer : conductors have positive coefficient. means as the temperature increases resistance also increases.

Description : Select insulating materials for following parts : (i) Insulation between heating element and base plate of electric iron. (ii) Insulation used over copper or aluminium conductor used for making coils. (iii) Transformer bushings. (iv) Insulation between transmission line and pole.

Answer : Parts Insulating Materials  Insulation between heating element and base plate of electric iron. Mica Insulation used over copper or aluminium conductor used for making coils.  ... Transformer bushings Porcelain  Insulation between transmission line and pole. Porcelain

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 

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 : State the impurities for obtaining p-type and n-type semiconductor from intrinsic semi conductor. 

Answer : Crystals of Silicon and Germanium are doped using two types of dopants:  1. The impurities for obtaining n-type semiconductor from intrinsic semiconductor are pentavalent impurity; like Arsenic (As), Antimony ... semiconductor are trivalent impurity; like Indium (In), Boron (B), Aluminum (Al), etc.

Description : Write the four factors affecting the resistance of a conductor. 

Answer : Factors affecting the resistance of a conductor: - 1.Physical state of a conductor 2.Length of a conductor 3.Area of cross section of a conductor 4.Resistivity of a conductor

Description : Define : (i)Conductor (ii)Semiconductor

Answer : Conductor: It contains large no. of free electrons at room temperature. the valence band and conduction band overlap with each other.  Semiconductor: A substance for which the forbidden energy gap is relatively small than insulator i.e in order of 1 eV.

Description : The diameter of conductor used in LT 660 V grade power cables depends on

Answer : The diameter of conductor used in LT 660 V grade power cables depends on current to be carried

Description : If 120 Coulomb of charge passes through a conductor in 60 sec, the current in the conductor is

Answer : If 120 Coulomb of charge passes through a conductor in 60 sec, the current in the conductor is 2 A

Description : Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is (A) 48 (B) 24 (C) 192 (D) 96

Answer : Number of commutator bars for a 4-pole, 2-layer, DC lap winding with 24 slots and one conductor per layer is 24

Description : At temperatures above a limiting value, the energy of lattice vibrations, in a conductor, increases linearly with temperature so that resistivity increases linearly with temperature. In this region, this limiting value of temperature is called

Answer : At temperatures above a limiting value, the energy of lattice vibrations, in a conductor, increases linearly with temperature so that resistivity increases linearly with temperature. In this region, this limiting value of temperature is called Debye temperature

Description : Best conductor of heat and electricity is (A) nickel (B) copper (C) chromium (D) aluminium 

Answer : Best conductor of heat and electricity is copper

Description : In a d.c. machine the force on a conductor placed on the periphery of the conductor is (a) directly proportional to parallel path (b) inversely proportional to the parallel path (c) inversely proportional to the length of the conductor (d) none of these

Description : A type of conductor known as expanded ACSR has a filler separating inner steel strands from outer aluminium strands and this filler is (a) mica sheet (c) paper tape (b) cotton tape (d) aluminium foil

Description : If the diameter of the current carrying conductor increases then the corona loss (a) increases (b) decreases (c) remains unchanged (d) none of these

Description : The short length of the conductor used to connect the line conductor on one side of the terminal pole to the line conductor on the other side of the pole is known as : a)jumper c) guard b) petticoat d) guy

Answer : The short length of the conductor used to connect the line conductor on one side of the terminal pole to the line conductor on the other side of the pole is known as : jumper

Description : The effective resistance of a conductor will be the same as ohmic resistance when : -  a) current is in true sine wave form b) voltage is low c) power factor is unity d) current is uniformly distributed in the conductor cross-section

Answer : The effective resistance of a conductor will be the same as ohmic resistance when : - current is uniformly distributed in the conductor cross-section

Description : Aluminium conductor cables can be joined by   (a) Gas welding (b) Soldering (c) Compression (d) Thermit welding

Answer : 1

Description : The skin effect of the conductor increases the effective value of   (a) Inductance of the conductor (b) Resistance of the conductor (c) Capacitance of the conductor (d) None of these

Description : With the increase in the cross sectional area of the conductor, the value of resistance:  (1) Increase (2) Remain same (3) Decrease (4) None of these

Answer : With the increase in the cross sectional area of the conductor, the value of resistance: Decrease.

Description : Upon increasing the transmission voltage, volume of the conductor will:  (A) increase (B) not change (C) decrease (D) increase for some time and then decrease

Answer : Upon increasing the transmission voltage, volume of the conductor will: decrease

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