Question

b. - engages the motor. *
rpm read - out
power switch
feed wheel
table
chuck
depth stop
speed adjustment
chuck key

Explanation:

The power switch is the component that turns on or engages the motor in a machine. Other options like RPM read - out shows speed, feed wheel moves material, table is a surface, chuck holds work - piece, depth stop controls depth, speed adjustment changes speed, and chuck key tightens chuck.

Answer:

B. Power Switch