G2 Practice Exam - Sample

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1. Gross stack temperature is the flue gas temperature: (#16-91)

Downstream of the draft hood

Upstream of the draft hood

Plus the ambient temperature

Minus the ambient temperature

2. What is the minimum service clearance vertical of a boiler? (#16-90)

18”

24”

36”

4”

3. A blue flame is the result of mixing primary air with gas prior to ignition. What is this type of flame referred to as? (#16-201)

A Bunsen flame

A luminous flame

A gas rich flame

An air rich flame

4. When two 10 microfarad capacitors are connected in parallel, what is the net result? (#16-194)

0 mf

5 mf

10 mf

20 mf

5. What is the flame speed for propane gas? (#16-184)

5 inches / sec

11 inches / sec

12 inches / sec

15 inches / sec

6. What is the boiling point for propane gas? (#16-189)

-44 °F

-920 °F

0 °F

32 °F

7. What is the boiling point of natural gas (the point at which it changes from a liquid to a gaseous state)? (#16-197)

-40 degrees Fahrenheit

-258 degrees Fahrenheit

0 degrees Fahrenheit

-32 degrees Fahrenheit

8. If 1 cubic foot of natural gas is 1000 Btuh, what is the ratio of excess air? (#16-179)

9. Heat Conduction is: (#16-163)

Heat transfer through solid objects

Heat transfer through fluids

A wave form of heat transfer

A form of latent heat transfer

10. What is the explosion limits for propane gas? (#16-188)

2.4 to 9.5%

1.9 to 8.5%

4 to 15%

5 to 10%

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