Question

The primary winding of a transformer has 500 turns whereas its secondary has 5000 turns. The primary is connected to an A.C. supply 20 V, 50 Hz. The secondary will have an output of

• A. 2 V, 50 Hz
• B. 2 V, 5 Hz
• C. 200 V, 50 Hz
• D. 200 V, 500 Hz.

Answer 1

The Correct Option is C

Turns on primary winding = 500; Turns on 
secondary winding = 5000; Primary winding 
voltage \((E_p)\) = 20 V and frequency = 50 Hz. 
\(\frac{N_s}{N_p}=\frac{E_s}{E_p} \, or \, \frac{5000}{500}=\frac{E_s}{20}\) 
or \(E_s=\frac{5000\times20}{500}=200 \, V\) and frequency remains 
the same. Therefore secondary winding will have 
an output of 200 V, 50 Hz.
So, the correct answer is (C): 200 V, 50 Hz.