Free C4 Boiler, Hot Water Heating, and Steam Fitting Exam.

Welcome to your free C-4 Boiler, Hot Water Heating and Steam Fitting Quiz.

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1. 
When using plastic refractory cement, how do you cure the plastic?

2. 
One disadvantage of a vertical boiler is__________.

3. 
A boiler pressure-relief valve must be equipped with a(n)__________.

4. 
If serious enough, cavitation in a centrifugal pump can cause__________.

5. 
Boilers over 25-gallon capacity must have a blowoff connection fitted with a valve__________.

6. 
An automatic nonreturn valve is placed__________.

7. 
Caustic cracking or embrittlement can result in__________.

8. 
What usually causes foam in a boiler?

9. 
What determines tube length in a radiant system?

10. 
When is it permitted NOT to have an electrical switch on the boiler?