Listed below are sample questions for 3E151O from our database. Register now to start taking tests for this AFSC! We have 394 questions currently in the database for this category.
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The version of this CDC we have in the database is 1
1 . 58. (031) Temperature at the rectifying photocell must remain under
2 . 99. (244) What is the most common type of glycol used in hot-water heating systems?
3 . 57. (224) The proper way to purge the furnace of a boiler is to purge 5 minutes at
1/4 the maximum airflow.
4 . 49. (427) What meter should you use to check a two-position control without power?
5 . When you perform a test to ensure that the safety limit control is operating properly, which circuit do you disconnect?
6 . 69. (036) What steps can be taken to provide a stronger pilot flame on a flame rod rectification system?
Increase gas pressure or enlarge the orifice.
7 . 83. (627) Under what step of preparing test reports does listing systems in groups, supplies, returns, and exhausts come?
Filling out an air system recap sheet.
8 . 11. (405) Saturated steam is steam
at the temperature of boiling water.
9 . 10. (204) What type of gas space heaters can be either gravity or mechanical air-circulation type and vented or unvented type?
10 . 58. (431) Use the following information to answer the next question: Controller = Barber Colman. ; Vcal = 7.5 VDC (at midpoint). ; Spanc = 3 VDC (6 – 9 direct current voltage (VDC). ; Tsp = 70° Fahrenheit. ; TRc = 4° Fahrenheit. ; Action = direct. What should the output voltage (Vout) be if the sensor is sensing 68°F?
6 direct current voltage (VDC).
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