Author Question: When do normally open relay contacts close? A) They cannot close because they are open contacts. ... (Read 239 times)

s.tung · **on:** Jul 24, 2018

When do normally open relay contacts close?

A) They cannot close because they are open contacts.
B) When the relay coil is energized
C) When the relay coil is de-energized
D) When they receive power

Question 2

What power source does a heater normally operate on?

A) 300 V to 400 V B) 208 V to 240 V C) 150 V to 250 V D) 200 V to 240 V