Interview Question

Maintenance Engineer Interview

-Chicago, IL


Tell me about a time you are face with a difficult situation, How did you solve it? Given a room with 3 light bulbs which have their respective three switches (On/Off) outside the room. You don't know which switch corresponds to which light bulb. You can do whatever you want with the switches but you can enter the room only once. How will you find which light switch corresponds to which light bulb?

AnswerAdd Tags

Interview Answers

3 Answers


Turn them all on!

Anonymous on


If you take one at a time once there there on remove one wire or off but you have to turn power on again you should find which switch belongs to the bulbs.

Anonymous on


I talked about my past experience

Anonymous on

Add Answers or Comments

To comment on this, Sign In or Sign Up.