Question

A step up transformer connected to a 220 V AC line is to supply 22 kV for a neon sign in secondary circuit. In primary circuit a fuse wire is connected which is to blow when the current in the secondary circuit exceeds 10 mA. The turn ratio of the transformer is

• A. 50
• B. 100
• C. 150
• D. 200

Answer 1

Answer: (B)

100

Answer 2

$\frac{N_{s}}{N_{p}} = \frac{V_{s}}{V_{p}} = \frac{22000}{220} = 100$