Why is the contact surface in relays and contactors coated with a special coating of very conductive material?
What will be an ideal response?
This coating is very thin but effective in preventing the contacts from becoming quickly damaged from the momentary arc as they open and close. This arc would normally cause the contacts to weld themselves together.
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Which of the following can cause off-spec products to be produced?
A) Improper valve operation B) Improper operation of the chlorine system C) Improper /incorrect treatment of cooling water chemically D) All of the above
List the three types of torches used for soldering and brazing
What will be an ideal response?
In the accompanying figure, diode D7 is an LED connected in ____ with the gate of the SCR.
a. series
b. parallel
c. sequence
d. link
The locked rotor amperage, LRA, of a motor is typically five times higher than the full load amperage, FLA, of the motor and can be as high as seven times the FLA.
Answer the following statement true (T) or false (F)