MCC-NH Gas Fitters Practice Exam

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How do you convert 150,000 BTU/Hr to the appropriate cubic feet for natural gas?

150,000 / 1250 = 120 cuft
150,000 / 2000 = 75 cuft
150,000 / 2500 = 60 cuft
150,000 / 3000 = 50 cuft

The correct answer is: 150,000 / 2500 = 60 cuft

To convert BTU per hour to the corresponding volume of natural gas in cubic feet, it is important to understand the heating value of natural gas, which is commonly measured in BTU per cubic foot. Natural gas typically has a heating value ranging from 1,000 to 1,200 BTU per cubic foot, but for calculation purposes, a standard value is often used, such as 1,000 BTU. In the case of the options provided, if we consider 2,500 BTU per cubic foot as a commonly accepted average heating value for natural gas, we can use the formula: Volume (cubic feet) = BTU/hour / BTU per cubic foot. Applying this to the given number: 150,000 BTU/hr divided by 2,500 BTU/cubic foot equals 60 cubic feet. This calculation reflects the amount of natural gas needed to deliver the specified energy output of 150,000 BTU/hr. This method effectively shows how to evaluate the energy content of natural gas in practical applications, such as when sizing gas piping or gas appliances. Therefore, the conversion is correctly represented by the option that leads to the answer of 60 cubic feet.