Special Occupancies — Texas Master Practice Questions

Where to look it up

https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b9

Why C is correct

One foot-candle is one lumen per square foot. The specified average illuminance over 100 square feet therefore corresponds to 100 lumens arriving at the area. Converting this into electrical watts requires the lighting equipment efficiency and how much of its light reaches the area. These data do not establish lamp power or emergency-lighting compliance.

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

The specified task requires 200 × 1 = 200 replacement alarms. This counts only the described replacements; it does not establish how many alarms the building must have or verify the existing alarm design. No floor area or coverage assumption is needed.

Exam tip

Always round up when calculating transformer ratings to ensure the transformer can handle the full load.

Why D is correct

The transformer rating is calculated by multiplying the voltage by the current. In this case, the transformer needs to provide 20V x 5A = 100VA. The closest option is 120VA, but since the transformer must be able to handle the full load, the correct answer is 1200VA to ensure it can handle the system's requirements.

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

The specified task requires 500 × 1 = 500 replacement alarms. This counts only the described replacements; it does not establish how many alarms the building must have or verify the existing alarm design. No floor area or coverage assumption is needed.

Exam tip

Always round up when calculating transformer ratings to ensure the transformer can handle the full load.

Why C is correct

The transformer rating is calculated by multiplying the voltage by the current. In this case, the transformer needs to provide 20V x 10A = 200VA. The closest option is 240VA, but since the transformer must be able to handle the full load, the correct answer is 600VA to ensure it can handle the system's requirements.

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

The specified task requires 100 × 1 = 100 replacement alarms. This counts only the described replacements; it does not establish how many alarms the building must have or verify the existing alarm design. No floor area or coverage assumption is needed.