Directions : For the Assertion (A) and
Reason (R) below, choose the correct alternative :
Assertion (A) : 3 wire dc distribution
system is preferred over 2 wire dc distribution system. Reason (R) : the 3 wire
dc system of distribution is more safe.
Both A and R are true and R is not the
explanation of A
Both A and R are true and R is the
correct explanation of A
None of these
A is true but R is false
A is true but R is false
3 wire dc distribution system is
preferred over 2 wire dc distribution system.
1. A 3-wire has not only a higher
efficiency of transmission but when used for Distribution purposes, it makes
available two voltages at the consumer's end.
2. As compared to a dc 2-wire
distributor, a 3-wire distributor with same maximum voltage to earth uses only
31.25 % of copper.
Hence, the correct option is (D).
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