5. An accessible, approved shutoff valve must be installed in the piping within a specified proximity to each appliance to allow for: a. foundation settling.
b. concealed pipe joints.
c. servicing, removal, and replacement.
d. reduction in gas pressure.
C
Chapter 5 | Hearth Appliance Categories 1. Which of the following is true about the efficiency ratings provided by Annual Fuel Utilization Efficiency
(AFUE) and Steady State Efficiency?
a. Although established by different government agencies, the two rating systems are identical.
b. Steady State Efficiency ratings are likely to be higher than AFUE ratings since they do not include start up or cool down periods
c. AFUE and Steady State Efficiency ratings are required for decorative appliances.
d. AFUE and Steady State Efficiency ratings are required for heater rated appliances.
B
2. According to the ANSI standard, unvented room heaters, other than for bedrooms or bathrooms, can NOT have an input rating in excess of:
a. 10,000 Btu/hr
b. 20,000 Btu/hr
c. 40,000 Btu/hr
d. 60,000 Btu/hr
C
3. Which of the following is NOT a function of the automatic gas control valve? a. Maintaining a steady and even flow of gas.
b. Mixing the proper air and fuel mixture.
c. Shutting off gas flow in the event of loss of flame.
d. Providing both a manual and electronic control of
gas flow.
B
Chapter 6 | Principles of Gas Appliance Venting 1. How much dilution air is required when burning 100 cubic feet of natural gas in a direct vent appliance?
a. 250 cubic feet
b. 800 cubic feet
c. 2,600 cubic feet
d. Direct Vent appliances do not require dilution air
D
2. Natural draft appliances that normally operate at vent temperatures that avoids excessive condensate problems in the vent are classified as: a. Category 1
b. Category 2
c. Category 3
d. Category 4
Correct answer a
Chapter 7 | Venting Classifications
1. How tall must a gas vent that terminates closer than 8 feet from a vertical wall?
a.2 feet
b. 3 feet
c. 8 feet
d. 10 feet.
Correct answer: с
2. B Vent pipe is tested to:
480 degrees
b. 1000 degrees
c. 1700 degrees
d. 2100 degrees
A
3. Which vent type allows dilution air to enter the system? B Vent b. Direct Vent
c. Masonry
d. Factory-Built UL 103 HT Chimneys
A
4. Which of the following is not an acceptable chimney liner for gas hearth appliances? a. Single wall galvanized pipe
b. Aluminum flex pipe
c. Stainless-steel rigid pipe
d. Type B vent
A
a. 20" x 3" b. 4 ^ prime prime *25^ prime prime
= 30 ^ prime prime *2^ prime prime
B
2. A conventional vent gas fireplace is to be installed in a room that is 20' * 15' with an 8' ceiling. The house has a known 0.35 air change per hour (ACH). Use the Known Air Infiltration Rate (KAIR) formula below to determine which of the following is the highest possible gas fireplace input rating for this toom, without providing additional combustion air. a. 24.000 Btu/hr
b. 35,000 Btu/hr
I other
c. 40,000 Btu/hr
1000Bm / h * r
d. 60,000 Btu/hr
C
3. What information is not needed for determining combustion air requirements for a room when using the Standard Method nd in the fuel gas codes? ]
Ceiling height
b. Tightness of building construction
c. Use of the room
d. Input rating of all appliances in the room