Discussion
That transformer supplying 20 A on its secondary draws a primary current of about
Answer: C
Correct answer: 5 A
Ampere-turns balance, so the current transforms by the inverse of the turns ratio: \[ I_1 = I_2\frac{N_2}{N_1} = 20 \times \frac{250}{1000} = 5\ \text{A.} \] Check it against the power: the secondary delivers \( 100 \times 20 = 2000 \) VA and the primary draws \( 400 \times 5 = 2000 \) VA, as it must if losses are neglected.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development