If a 200 kVA, 2000/200 V transformer has 100 turns in its secondary windings, then the number of turns in its primary are __________.

Question

Question

This question was previously asked in

ALP CBT 2 Electrician Previous Paper: Held on 22 Jan 2019 Shift 1

Answer 1

Concept:

In a transformer, the voltage & number of turns are related as

\(\frac{{{V}_{1}}}{{{V}_{2}}}=\frac{{{N}_{1}}}{{{N}_{2}}}\)

Where,

V₁ = Voltage across primary side of the transformer

V₂ = Voltage across the secondary side of the transformer

N₁= Number of turns in primary side of transformer

N₂= Number of turns in secondary side of transformer

Calculation:

V₁ = 2000

V₂ = 200

N₂= 100

\(\frac{2000}{200}=\frac{{{N}_{1}}}{100}\)

⇒ N₁= 1000