Construction Health and Safety Technician (CHST) Practice Test 2025 - Free CHST Practice Questions and Study Guide

Question: 1 / 460

Given the following information, calculate the WBGT index: Outdoor globe temperature of 101°F, wet-bulb temperature 94°F, dry bulb temperature 97°F. What is the WBGT index?

94°F

96°F

To calculate the Wet Bulb Globe Temperature (WBGT) index, specific weighted averages of the temperature readings are utilized, taking into account the conditions under which a person would be exposed to heat. The WBGT is particularly useful in assessing heat stress in outdoor environments, particularly where humidity and radiant heat affect thermal comfort and safety.

In this case, the WBGT index can be determined using the provided outdoor globe temperature, wet-bulb temperature, and dry bulb temperature. The general formula for calculating the WBGT for outdoor conditions is:

WBGT = 0.7 × Wet Bulb Temperature + 0.2 × Globe Temperature + 0.1 × Dry Bulb Temperature

Substituting the given values into the formula:

- Wet Bulb Temperature = 94°F

- Globe Temperature = 101°F

- Dry Bulb Temperature = 97°F

Calculating this:

WBGT = (0.7 × 94°F) + (0.2 × 101°F) + (0.1 × 97°F)

WBGT = 65.8°F + 20.2°F + 9.7°F

WBGT = 95.7°F

In rounding, this typically leads to

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98°F

100°F

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