What is a fundamental purpose of a step-up or step-down transformer?

Question

Options

• ASupply a neutral reference on the secondary side that is different than what is supplied on the primary side.
• BSupply a ground reference on the secondary side that is different than what is supplied to the primary side.
• CDeliver a voltage reference on the secondary side of the transformer different than what is supplied to the primary side.
• DDeliver the same voltage reference on the secondary side of the transformer equal to that supplied on the primary side.

• A
  17% (11)
• B
  8% (5)
• C
  71% (45)
• D
  3% (2)

Explanation

Option C is correct because the defining function of a step-up or step-down transformer is to use electromagnetic induction across a wound coil ratio to produce a secondary voltage that is either higher or lower than the primary input voltage - delivering a different voltage reference on the output side.

Option A is wrong because "neutral reference" refers to a wiring conductor concept, not the voltage transformation function; transformers do not exist primarily to establish a neutral.

Option B is wrong for a similar reason - ground reference is a safety and bonding concept, and while some transformer configurations can affect grounding arrangements, that is not the fundamental purpose of a step-up or step-down transformer.

Option D describes a 1:1 isolation transformer, which deliberately keeps the secondary voltage equal to the primary; by definition, a step-up or step-down transformer changes the voltage ratio, so D is the opposite of what these devices do.

Memory tip: The name tells you the job - "step-up" raises the voltage, "step-down" lowers it, so the secondary is always different from the primary. If the secondary were the same, there would be no "step."

No community discussion yet for this question.