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WBCS Main Examination 2023 — Paper IV: General Studies II · Question 195 of 200

Q195
General SciencePhysics
Quantity that remains unchanged in a transformer is
  1. a.Voltage
  2. b.Current
  3. c.Frequency
  4. d.Current density

Answer: (C) Frequency

A transformer changes voltage and current between its windings but cannot change the frequency of the AC, which is set by the supply. Current density changes along with the current.

Q194 Whole paperQ196