Dogcare manager interview questions and answers

8. Why AC systems are preferred over DC systems?
Due to following reasons, AC systems are 
preferred over DC systems:
a. It is easy to maintain and change the voltage of 
AC electricity for transmission and distribution.
b. Plant cost for AC transmission (circuit 
breakers, transformers etc) is much lower than 
the equivalent DC transmission
c. From power stations, AC is produced so it is 
better to use AC then DC instead of converting 
it.
d. When a large fault occurs in a network, it is 
easier to interrupt in an AC system, as the sine 
wave current will naturally tend to zero at some 
point making the current easier to interrupt.
www.EngineeringBooksPdf.com

---