A common transistor radio set requires 12 ,V (D.C.) for its opera… - Vidyadip

MCQ

A common transistor radio set requires $12\,V (D.C.)$ for its operation. The $D.C.$ source is constructed by using a transformer and a rectifier circuit, which are operated at $220\, V$ $(A.C.)$ on standard domestic $A.C.$ supply. The number of turns of secondary coil are $24,$ then the number of turns of primary are

A
$220$
B
$110$
✓
$440$
D
$880$

✓

Answer

Correct option: C.

$440$

c
$\frac{ N _{ P }}{ N _{ S }}=\frac{ V _{ P }}{ V _{ S }}$

$\frac{ N _{ P }}{24}=\frac{220}{12}$

$N _{ P }=\frac{220 \times 24}{12}$

$N _{ P }=440$

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