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DMRC JE EE 2018 Official Paper 2

Option 4 : K < 1

**Transformation ratio** of transformer is given by K = V2/V1 = E2/E1 = N2/N1.

Where N1 is the number of primary turns

V1 is the primary voltage

N2 is the number of secondary turns

V2 is the secondary voltage

**Step-up transformer:**

A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer.

Therefore, K > 1

**Step down transformer:**

A transformer that decreases the voltage from primary to secondary (more primary winding turns than secondary winding turns) is called a step-down transformer.

Therefore, K < 1

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