Gas Fitter Practice Test

A one cubic foot test dial on a natural gas meter makes one revolution every 22 seconds. Approximately how many Btuh are being generated?

1. 164 MBtuh

2. 41 MBtuh

3. 75 MBtuh

4. 82 MBtuh

The correct answer is: 164 MBtuh

To determine the number of Btuh (British thermal units per hour) being generated based on the information given about the natural gas meter, you need to calculate how many cubic feet of gas are passing through the meter in one hour. The meter makes one revolution every 22 seconds, which indicates that for each revolution, one cubic foot of natural gas is consumed or used. Over the course of one hour (which is 3600 seconds), you can find out how many revolutions (or cubic feet) occur by dividing the total seconds in an hour by the seconds per revolution: 3600 seconds/hour ÷ 22 seconds/revolution ≈ 163.64 revolutions/hour. Since each revolution corresponds to one cubic foot of gas, this means approximately 163.64 cubic feet per hour are being generated. To convert cubic feet per hour to Btuh, you need to know that one cubic foot of natural gas contains roughly 1,000 Btus. Therefore, you multiply the cubic feet per hour by the Btus contained in one cubic foot: 163.64 cubic feet/hour × 1,000 Btus/cubic foot = 163,640 Btuh, or approximately 164 MBtuh (since 1 MBtuh