What is the lower calibration limit for a Navy 40 to 120 degree F bimetallic thermometer with a smallest readable scale increment of 2 degrees?

• A. 96 degrees
• B. 98 degrees
• C. 100 degrees
• D. 102 degrees

Answer: (B)

To determine the lower calibration limit for a Navy 40 to 120 degree F bimetallic thermometer with the smallest readable scale increment of 2 degrees, one must consider the functional range of the instrument and the resolution defined by the smallest increment.

The thermometer’s operational range starts at 40 degrees F. However, the calibration limits must be considered in relation to the smallest readable increment. Since the thermometer reads in increments of 2 degrees, any valid calibration point must be a multiple of 2 degrees from a defined starting point that complies with the operational range.

The closest multiple of 2 degrees above 40 degrees that is established as the lower calibration limit for practical use would typically strive to ensure effective measurements can be accurately taken. In this case, 98 degrees would not only be within the operational range but also serves as a feasible point that respects the resolution of the thermometer.

Therefore, the lower calibration limit is defined at 98 degrees F, which allows for accurate readings and aligns with the defined specifications of having increments of 2 degrees. This ensures effectiveness in operational functionality within the instrument's specified range.