Description : The best conductor of electricity among the following is - (1) copper (2) iron (3) aluminum (4) silver
Last Answer : (4) silver Explanation: Copper and Silver Are Most Common. Silver is the best conductor of electricity because it contains a higher number of movable atoms (free electrons).
Description : The best conductor of electricity among the following is : (1) Copper (2) Iron (3) Aluminium (4) Silver
Last Answer : (4) Silver Explanation: Copper: 9% less conductive than silver; aluminium is 10% less conductive than copper; while steel is the least conductive among the given options. The most electrically conductive metal is silver.
Description : Which of the following is the best conductor of electricity? (1) Zinc (2) Copper (3) Gold (4) Silver
Last Answer : (4) Silver Explanation: Copper and Silver Are Most Common. Silver is the best conductor of electricity because it contains a higher number of movable atoms (free electrons).
Last Answer : Silver
Description : State four advantages of copper over aluminum as a conductor.
Last Answer : It has higher conductivity, it is more ductile, it has relatively high tensile strength, and it can be easily soldered.
Description : Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator? (A) Cresylic acid (B) Copper sulphate (C) Calcium carbonate (D) Sodium carbonate
Last Answer : (B) Copper sulphate
Description : Is a silver a conductor or insulator?
Last Answer : is copper a conductor or insuilator
Description : Is an silver bracelet a conductor?
Last Answer : Insulator
Description : Drinks remain hot or cold for a long time in a thermos flask because of the (a) presence of air, which is a bad conductor of heat, in between the double walls (b) silver coating on the inside of the double walls (c) vacuum between the double walls (d) combined effects of (b) and (c)
Last Answer : Ans:(d)
Description : Which one of the following is an ohmic conductor? (1) Germanium (2) Silicon (3) Carbon (4) Silver
Last Answer : (4) Silver Explanation: Ohmic conductors are conductors that obey Ohm's law, that is Voltage/Current ratio is constant; in other words, the equation Resistance = Voltage/Current is obeyed. ... s resistance does not change with varying current. Metallic conductors such as silver are Ohmic conductors.
Description : Explain with justification two uses of each of two following as an electrical conductor: (i) Brass (ii) Silver
Last Answer : (i) Brass: Brass is an alloy of copper (60% ) and zinc ( 40%) ; the proportions of zinc and copper can be varied to create a range of brasses with varying properties. Brasses set ... electrical conductor: 1) In switches to minimize contact resistance 2) In measuring instruments 3) In relays
Description : Which is the best conductor: silver, carbon, or iron?
Last Answer : Silver is the best conductor. Carbon is the semiconductor. Iron have less conductance as compared to silver.
Description : How much of the stripped length of a conductor should be tinned?
Last Answer : One-half the stripped length.
Description : For an electric field to exist at the surface of a conductor, the field must have what angular relationship to the conductor?
Last Answer : The field must be perpendicular to the conductors.
Description : What causes the current-carrying area at the center conductor of a coaxial line to be restricted to a small layer at the surface?
Last Answer : Skin effect.
Description : What is the purpose of the green conductor in a power tool or electrical appliance cable?
Last Answer : To prevent electrical shock to the operator in case there is an electrical short to the frame of the appliance or too.
Description : What determines whether a substance is a conductor or an insulator?
Last Answer : The number of valence electrons.
Description : An emf is generated in a conductor when the conductor is cut by what type of field?
Last Answer : Magnetic field.
Description : Compare the resistance of a conductor to that of an insulator.
Last Answer : Conductors have a very low resistance and insulators have a resistance that is so great that, for all practical purposes, they are nonconductors.
Description : State why it is important for you to consider the ambient (surrounding) temperature of a conductor when selecting wire size.
Last Answer : The heat surrounding the conductor is an important part of total conductor heating.
Description : List the three factors used to calculate resistance of a particular conductor in ohms.
Last Answer : Length, cross-sectional area, and specific resistance of a unit volume of the substance from which the conductor is made
Description : Define a square mil as it relates to a square conductor
Last Answer : The cross-sectional area of a square conductor with a side of 1 mil.
Description : Calculate the diameter in MILS of a conductor that has a diameter of 0.375 inch.
Last Answer : 375 mils (move the decimal three places to the right).
Description : Is it considered safe for a person to touch any energized low-voltage conductor with the bare hand?
Last Answer : NEVER! All energized electric circuits should be considered potentially dangerous.
Description : If the insulation of a conductor was being measured in figure1-51 (A), would the reading indicate a good insulation?
Last Answer : Yes.
Description : What is the procedure for using a megger to check the insulation of a conductor?
Last Answer : Connect one lead to the insulation and one lead to the conductor. Turn the handcrank until it starts to slip. Note the reading
Description : How would the compass react if the alternating current through the conductor was a high frequency?
Last Answer : The compass needle would vibrate rapidly around the zero current point ac meter (magnetic north).
Description : How would a compass react when placed close to a conductor carrying alternating current at a low frequency?
Last Answer : The compass needle would swing back and forth as the current changed from positive to negative.
Description : If the amount of current in the conductor changes, what happens to the magnetic field around the conductor?
Last Answer : If the current increases the magnetic field increases; if the current decreases the magnetic field decreases.
Description : How does a compass react when placed close to a current carrying conductor?
Last Answer : The compass needle swings away from magnetic north and aligns itself with the magnetic field around the conductor
Description : What structurally large, low-resistance conductor is connected in parallel with the meter movement to prevent damage?
Last Answer : Shunt.
Description : A carbon resistor has the following color bands: The first band is yellow, followed by violet, yellow, and silver. What is the ohmic value of the resistor?
Last Answer : 470,000 ohms (470 kilo ohms).
Description : The ……… consists of two conductors, where one is the inner conductor of solid copper -Technology
Last Answer : (c) Co-axial cable consists of two conductors which are parallel to each other, i.e. inner and outer conductor.
Description : Is copper insulator or conductor?
Last Answer : Conductor, which is why it's used for wires.
Description : A straight round copper conductor of radius `R = 5.0 mm` carries a current `I = 50 A` Find the potentail difference between the axis of the conductor
Last Answer : A straight round copper conductor of radius `R = 5.0 mm` carries a current `I = 50 A` Find the potentail difference ... to `n = 0.9.10^(33) cm^(-3)`.
Description : Find the mobility of the conduction electrons in a copper conductor if in Hall effect measuremaents performed in the magnetic fileld of induction `B =
Last Answer : Find the mobility of the conduction electrons in a copper conductor if in Hall effect measuremaents ... than that of the longtudinal electric field.
Description : What is the drift velocity of electrons in a copper conductor having a cross-sectional area of `5xx10^(-6) m^(2)` if the current is 10 A. Assume there
Last Answer : What is the drift velocity of electrons in a copper conductor having a cross-sectional area of `5xx10^(-6) m^( ... `8.0xx10^(28) "electrons"//m^(3)`.
Description : At room temperature copper has free electron density of `8.4xx10^(28) per m^(3)` . The copper conductor has a cross-section of `10^(-6)m^(2)` and carr
Last Answer : At room temperature copper has free electron density of `8.4xx10^(28) per m^(3)` . The copper conductor has a cross ... . `4cms^(-1)` D. `0.4mms^(-1)`
Description : Is a copper wire a insulator or conductor?
Last Answer : conductor
Description : Copper wires are generally used for electrical power transmission instead of iron wire because (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron
Last Answer : (3) copper is a better conductor of electricity than iron Explanation: Copper is generally preferred for electrical power transmission instead of iron because of its high electrical conductivity and low resistivity.
Description : To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor - (1) should be made of a good conductor but can be of any shape (2) should be in the form ... can be of any shape (4) should be made of a good conductor like copper with sharp-pointed edges
Last Answer : (4) should be made of a good conductor like copper with sharppointed edges Explanation: A lightning conductor is made up of a sharp pointed metal (usually copper metal, as it is a very good ... cloud, it will first strike the pointed tip of the lightning conductor and quickly travel to the earth.
Description : Copper is often used as an electrical conductor because it _______________. A. has high resistance at low temperatures B. has a highly polished surface C. is able to pass current with little opposition D. holds insulation together well
Last Answer : Answer: C
Description : Since fuse elements are made of zinc or any alloy of tin and lead, the melting point of the fuse element must be _____________. A. higher than that of copper B. lower than that of copper C. equal to that of copper D. reached when the conductor it is protecting becomes 'white hot.'
Last Answer : Answer: B
Description : Which is least Conductor of Electricity among the following? A. Wood (Answer) B. Copper C. Iron D. Water
Last Answer : A. Wood (Answer)
Description : Copper as conductor for cables is used as (a) annealed (b) hardened and tempered (c) hard drawn (d) alloy with chromium
Last Answer : (a) annealed
Description : Copper wires are generally used for electrical power transmission instead of iron wire because : (1) copper is cheaper than iron (2) copper is lighter than iron (3) copper is a better conductor of electricity than iron (4) copper can take higher power than iron
Last Answer : copper is a better conductor of electricity than iron
Description : To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor (1) should be made of a good conductor but can be of any shape (2) should be in the form of ... can be of any shape (4) should be made of a good conductor like copper with sharp-pointed edges
Last Answer : should be made of a good conductor like copper with sharp-pointed edges
Description : Explain the suitability of copper as an electrical conductor with reference to its mechanical and electrical properties.
Last Answer : Following are properties of conductor:- i) High conductivity :- Material should have high conductivity, So that * Cross section of conductor (size) reduces, * Copper losses reduces, * So Efficiency ... ; less costly. ix) Scrap Value:- Material should have high scrap value.
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.
Last 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