Answer / ashok

There is no polarity for resistance. In AC consider voltage
and in DC current should be consider

Answer / dileep t

The A.C resistance is always greater than D.C resistance.
A.C resistance is about 1.62 times D.C resistance. In D.C
the frequency is zero . Hence the total impedance of a line
will be only resistive.
z=R+XL
since f=0;XL=0
Z=R.
But in A.C f is not equal to zero. Hence Z will be large as
compared with D.C

Answer / suresh

d.c resistance is only resistance due to the virtue of
conductor property only, a.c resistance is due to both
virtue of conductor property and skin effect.

Answer / blade

In AC the movement of electric charge periodically reverse.
In DC the movement of electric charge is only in one
direction.

why there is a temperature rise at different metal to metal contact at cable lug??suppose cable is aluminium and the lug is copper,than why the temperature rise takes place??

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sir my exam is on 19/6/2013 under electrical branch pls send me sample aptitude questions as well as sample technical questions for jindal steel and power company

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