Which one of the folio whig devices changes low voltage alternating cuiTent to high voltage alternating current and vice versa ?

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Q: 1 (NDA-I/2017)

Which one of the folio whig devices changes low voltage alternating cuiTent to high voltage alternating current and vice versa ?
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question_subject: 

Science

question_exam: 

NDA-I

stats: 

0,41,14,8,6,41,0

keywords: 

{'folio whig devices': [0, 0, 0, 1], 'transformer': [0, 1, 0, 2], 'high voltage': [0, 0, 0, 4], 'low voltage': [0, 0, 0, 3], 'generator': [0, 0, 1, 2], 'vibrator': [0, 0, 0, 1], 'current': [0, 0, 0, 3], 'motor': [0, 0, 1, 2], 'vice': [1, 0, 0, 1], 'cuitent': [0, 0, 0, 1]}