NALMCO Certified Apprentice Lighting Technician (CALT) Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the NALMCO Certified Apprentice Lighting Technician Test. Enhance your knowledge with multiple-choice questions, tips, and exam insights to ensure success. Get ready to shine in your exam!

Practice this question and more.

What is the diameter of a BT56 lamp?

56 inches
5.6 inches
8 inches
7 inches

The correct answer is: 7 inches

The diameter of a BT56 lamp refers to the measurement of the widest part of the bulb. The abbreviation "BT" stands for "Bulged Twin" and the number following it indicates the width in eighths of an inch. Therefore, a BT56 lamp has a diameter of 56 eighths of an inch, which can be converted by dividing 56 by 8, resulting in 7 inches. This reinforces the understanding that the designation BT followed by a number directly correlates to the diameter of the bulb in inches when divided by eight.