![Mcqmate logo](https://mcqmate.com/public/images/logos/logo-black.png)
![Mcqmate logo](https://mcqmate.com/public/images/logos/logo-white.png)
McqMate
Q. |
When a mercury vapour black light is inadvertently cut off, approximately how long should it be allowed to cool before attempting to restart? |
A. | Not required |
B. | 2 to 3 minutes |
C. | 5 minutes |
D. | 10 minutes |
Answer» C. 5 minutes |
View all MCQs in
Non Destructive Testing and EvaluationNo comments yet