ELECTRONICS EXAM 3 QUESTION AND ANSWER
how many layers make up a diode and what are they? - 2 layers, P and N type
what device is the case of an SCR usually connected to? - heat sink
in DC ccts, what is an SCR most often used for? - solid state switches
which SCR layer is the gate attached to? - inside, "ptype"
are SCRS uni directional? - Yes
what is the most common cause of an SCR failure? - gate damage due to excessive current
How does a shorted SCR perform in an AC cct? - like a closed switch
why is an SCR used as a high current switch? - no arching, no pitting
with risistance only triggering, what happens if the gate pulse current is not enough when you
reach 90 degrees? - The SCRs anode and kathode remains open
what is the main difference between SCRs and Triacs? - SCRs are uni-directional and triacs are
bi-directional
does a triac need a gate protection diode? - No
a diac/triac package is used in what electrical device? - light dimmers
