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Question

Why is copper a better conductor of electricity than 
aluminium?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
Because copper has more free electrons than aluminium but
not as much as gold or silver.
 
Is This Answer Correct ?    6 Yes 1 No
Therion
 
Answer
# 2
since copper has high current carrying capacity..
it has low resistance..
it is of smaller in size then aluminium...
 
Is This Answer Correct ?    9 Yes 5 No
Deepak Thakur
 
 
 
Answer
# 3
The electrical capacity of any type of cables/wires are
depending on the heat withstand capacity of the material
wich can be calculated with the product of square of
current, Resistance of the material and Total time for flow
of current. I2RT. Resistance again can be calculated as
R=rho*L/A where rho is the resistivity, L is the length and
A is the area of cross section. So for a fixed current flow
and fixed Length of wire the area of cross section of the
cable is directly propotional to the resistivity.
resistivity of copper is 1.68x10 power -8 and that of Pure
Aluminum is 2.82x10 power -8. So.. for a specific current
flow, an aluminum cable size shall be 1.7 times that of
copper cable. This also is not recommented as the Aluminum
resistivity varries with the alloys and even with casting.
2.5 times the size of copper can be recommented for
Aluminum cables. Also as the temporature expansion of
Aluminum is 3 times that of copper. So all the termination
and joining areas shall be treated more sensible that of
copper.
 
Is This Answer Correct ?    1 Yes 0 No
Arul
 
Answer
# 4
Copper has less specific resistance than that of Aluminum....... 
Is This Answer Correct ?    1 Yes 4 No
Tariq
 
Answer
# 5
Copper has a lower resistance than aluminium so for the
same cross sectional area a copper cable will have less
power loss.
 
Is This Answer Correct ?    2 Yes 6 No
Kevin Fowke
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
High Voltage out door substation-annual maintenance, things to be considered   1
What is the impact of MCCB & MPCB on Distributed Control System?   6
which of the following loss varies with the load a)hystresis loss b)eddy current loss c)copper loss d)core loss   2
What is Electrical Engineering? L&T 13
how much power consumed by 1.5 ton capacity split A.C in 1 hour   2
in flemings lefthand rule thumb indicate for.... APPSC 2
Based on CPI/CGPA they shortlist the candidates & than directly start Interview so there is no Written Exam or GD Only PI.Interview held @ MNNIT , ALLAHABAD On-Campus on 6th,Aug, 2007 & the Questions asked to me by Interview Board ( 4 People) are from HR/SummerTraining/BTP/Subject-core, POWER SYSTEM & MACHINE. time duration of I/V is about 15-20 Minutes. HR- Q.1 Name,hobbies & About family background ? Q2.What u know abt NTPC ?? Q3.Why u want to choose NTPC as ur Carrier's starting i.e power sector not any other Oragnisation or sector ?? Techincal Questions- Q1.What is the reason for transformer Noise ?? Q2.Which material is used for making Transformer oil & How u measure its dielectric strength & Name the test ? Q.3 Which Machine u will prefer 2 use if flammble gases are coming out at a place & why ?? Q4.What is relation b/w Transmission Lines & Communication Lines ? Q5.What is the maximum capacity Synchronus Machine & total powerGeneration in our country ? Q.6 In india Power generation is at 50Hz while in America its 60 hz ,why so ?? Advantage or disadvantage ?? Q.7 Maximum Generation Voltage in india ? Q8. What is the Voltage regulation & why its required n how much is permissible ? & causes of voltage variation ?? Q.9 Why electric shock is feel ?? n in a Electric Train why we didnt feel that ? Q.10 Have u seen/ experience of any power plant/ industry related to the power sector ? so these are the questions which not too diffcult i think was asked to me. NTPC 6
what is use of lockout relay in ht voltage   2
Three phase star connected PT transformer primary side one phase fuse is blown what will be the output in secondary side(Secondary side also three phase star connected)   2
why fan consume constant power even when we increase or decrease its circuit resistance through speed regulator???   2
IN MCCB AND MCB TERMINATIONS ARE IN-COMING ON TOP AND OUT GOING ON BOTTOM,IF WE TERMINATED INTERCHANGED TOP AND BOTTOM ITS WORKS?   2
why do fans generally rotate in anti clock wise direction?? BMS 2
 
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