If there are 50 secondary turns for every one primary turn, the turn ratio will be ________.

• A. 50:1
• B. 1:50
• C. 5:1
• D. 100:2

Answer: (A)

The thing being tested is how to express the relation between secondary and primary turns. If there are 50 turns on the secondary for each single turn on the primary, the turn ratio of secondary to primary is 50:1. This is the direct way to capture the stated relationship.

The other options don’t fit: 1:50 would flip the order and imply the opposite relationship, 5:1 would mean only 5 secondary turns per primary, and 100:2 is the same proportion as 50:1 but is not in simplest form—standard practice is to present the simplest ratio.