Q. A cross-over requires (Solved)
1. two sets of switches and two crossings
2. two sets of switches and four crossings
3. four sets of switches and four crossings
4. none of these
- a. two sets of switches and two crossings
1. two sets of switches and two crossings
2. two sets of switches and four crossings
3. four sets of switches and four crossings
4. none of these