Q: 28 (CAPF/2013)

Transformer is used to
1. convert low a.c. voltage to high voltage
2. convert high a.c. voltage to low voltage
3. convert direct current to alternating current
4. regulate the fluctuation of voltage
question_subject: 
Science
question_year: 
2013
question_exam: 
CAPF
stats: 
0,904,904,136,448,904,320