Question

before installing bits into the drill chuck
select one:
a. make sure the drill press is off
b. get the instructor to install bit into the drill press
c. make the drill press is off and the spindle is not rotating
d. disconnect the power supply

Explanation:

Safety is crucial when using a drill press. To avoid injury from a moving spindle or accidental startup, it's necessary to ensure the drill press is off and the spindle is not rotating before installing bits. While turning off the drill press generally stops the spindle, stating both conditions explicitly is a more comprehensive safety measure compared to just turning it off. Disconnecting the power supply is an extreme and usually unnecessary step for bit - installation, and getting an instructor to install the bit is not always required if the user is trained.

Answer:

C. Make the drill press is off and the spindle is not rotating