RMGA Test questions with answers
Which of the following is the chemical formula for natural gas? - ** VERIFIED ANSWERS
**✔✔CH4
What is the best method to locate a gas leak? - ** VERIFIED ANSWERS **✔✔Combustible
Gas Detector
Is natural gas heavier than air? - ** VERIFIED ANSWERS **✔✔Yes
What is 2-4 times heavier than air? - ** VERIFIED ANSWERS **✔✔Gasoline
What component make Natural Gas "sour gas"? - ** VERIFIED ANSWERS **✔✔Hydrogen
Sulfide
What is added to Natural Gas to give it an identified odor? - ** VERIFIED ANSWERS
**✔✔Butyl Mercaptan/Thiophene
T/F? When Natural Gas comes out of the ground, it has no odor? - ** VERIFIED ANSWERS
**✔✔True
What is the flammability of Natural Gas? - ** VERIFIED ANSWERS **✔✔4%-14%
What temperature does Natural Gas ignite at? - ** VERIFIED ANSWERS **✔✔1200 degrees
How toxic is Natural Gas? - ** VERIFIED ANSWERS **✔✔Non-toxic
, When can combustion air be taken inside a home with tight construction? - ** VERIFIED
ANSWERS **✔✔Never
How many inches of free area are required for horizontal ducts into a mechanical room? - **
VERIFIED ANSWERS **✔✔1 in.(squared) per 2,000 BTUH
How many inches of free area are required for vertical ducts into a mechanical room? - **
VERIFIED ANSWERS **✔✔1 in. (squared) per 4,000 BTUH
What percentage of a wood grill is considerate to be free area? - ** VERIFIED ANSWERS
**✔✔25%
What is the smallest single duct that would be large enough to supply air into a mechanical
room with a 153,000 BTUH? - ** VERIFIED ANSWERS **✔✔7 in. x 8 in. duct
What is required when converting 2 horizontal ducts to a single duct? - ** VERIFIED
ANSWERS **✔✔A clearance of 1 in. on the back and sides and 6 in. to the front of all
appliances
What is the smallest size that will meet a 43 in. (squared) free area? - ** VERIFIED
ANSWERS **✔✔6 in. x 8 in. duct
T/F? Vertical ducts are sized the same as horizontal ducts. - ** VERIFIED ANSWERS
**✔✔False
What size metal grill would be the smallest needed to provide a 140 in. (squared) of free
area? - ** VERIFIED ANSWERS **✔✔14 in. x 14 in duct
If combustion air is obtained from a crawl space, how large must the grills be? - **
VERIFIED ANSWERS **✔✔1 square inch per 4,000 BTUH of all appliances in the space
Which of the following is the chemical formula for natural gas? - ** VERIFIED ANSWERS
**✔✔CH4
What is the best method to locate a gas leak? - ** VERIFIED ANSWERS **✔✔Combustible
Gas Detector
Is natural gas heavier than air? - ** VERIFIED ANSWERS **✔✔Yes
What is 2-4 times heavier than air? - ** VERIFIED ANSWERS **✔✔Gasoline
What component make Natural Gas "sour gas"? - ** VERIFIED ANSWERS **✔✔Hydrogen
Sulfide
What is added to Natural Gas to give it an identified odor? - ** VERIFIED ANSWERS
**✔✔Butyl Mercaptan/Thiophene
T/F? When Natural Gas comes out of the ground, it has no odor? - ** VERIFIED ANSWERS
**✔✔True
What is the flammability of Natural Gas? - ** VERIFIED ANSWERS **✔✔4%-14%
What temperature does Natural Gas ignite at? - ** VERIFIED ANSWERS **✔✔1200 degrees
How toxic is Natural Gas? - ** VERIFIED ANSWERS **✔✔Non-toxic
, When can combustion air be taken inside a home with tight construction? - ** VERIFIED
ANSWERS **✔✔Never
How many inches of free area are required for horizontal ducts into a mechanical room? - **
VERIFIED ANSWERS **✔✔1 in.(squared) per 2,000 BTUH
How many inches of free area are required for vertical ducts into a mechanical room? - **
VERIFIED ANSWERS **✔✔1 in. (squared) per 4,000 BTUH
What percentage of a wood grill is considerate to be free area? - ** VERIFIED ANSWERS
**✔✔25%
What is the smallest single duct that would be large enough to supply air into a mechanical
room with a 153,000 BTUH? - ** VERIFIED ANSWERS **✔✔7 in. x 8 in. duct
What is required when converting 2 horizontal ducts to a single duct? - ** VERIFIED
ANSWERS **✔✔A clearance of 1 in. on the back and sides and 6 in. to the front of all
appliances
What is the smallest size that will meet a 43 in. (squared) free area? - ** VERIFIED
ANSWERS **✔✔6 in. x 8 in. duct
T/F? Vertical ducts are sized the same as horizontal ducts. - ** VERIFIED ANSWERS
**✔✔False
What size metal grill would be the smallest needed to provide a 140 in. (squared) of free
area? - ** VERIFIED ANSWERS **✔✔14 in. x 14 in duct
If combustion air is obtained from a crawl space, how large must the grills be? - **
VERIFIED ANSWERS **✔✔1 square inch per 4,000 BTUH of all appliances in the space
