Engine 2014: Electricity

1. A two sets of normally open contacts which close when the trouble relay coil is energized
2. B two sets of normally closed contacts which close when the trouble relay coil is energized
3. C two sets of normally open contacts which open when the trouble relay coil is energized
4. D two sets of normally closed contacts which open when the trouble relay coil is energized

Tip: press A-D to answer