A transformer

(A) converts DC to AC
(B) is used to decrease or increase AC voltage
(C) converts AC voltage to D.C. voltage
(D) converts electrical energy into mechanical energy

Correct Answer : is used to decrease or increase AC voltage
Question Asked : SSC Combined Matric Level (Pre) Exam 1999, SSC (10+2) Level Data Entry Operator & LCD Exam 2011
Explanation : Transformers have made long-distance transmission of electric power a practical reality, as AC voltage can be "stepped up" and current "stepped down" for reduced wire resistance power losses along power lines connecting generating stations with loads. At either end (both the generator and at the loads), voltage levels are reduced by transformers for safer operation and less expensive equipment.
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Tags : Physics
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