Title: SCR Operation
Course: Electronics Theory (IC 102-IC 102) > Section: Assessments

Q: Adjust the potentiometer, at approximately what voltage is the SCR fired in mV? (turn on the lamp)
A: 750

Q: Close S1 and S2.  What is the state of the SCR?
- on
- off
A: on

Q: What is necessary to turn off the SCR? (lamp)
A: open S2

Q: With S1 open, in this particular operating state the SCR is acting as __________________.
- an open switch
- a closed switch
A: an open switch

Q: With S1 open, the SCR is evidently__________________.
- conducting on both half cycles
- conducting on every other half cycle
- not conducting at all
A: conducting on both half cycles

Q: Using the o'scopes signal, we can see that when the 1K ohm potentiometer is adjusted the SCR will fire for ____________ of the AC source. (amount of time lamp is lit)
- 90 degrees or less
- 180 degrees or less
- 270 degrees or less
- 360 degrees or less
A: 90 degrees or less

Q: With S1 closed and 1K ohm potentiometer set to 50% , the SCR is evidently _______________________.
- conducting on both half cycles
- conducting on every other half cycle
- not conducting at all
A: conducting on both half cycles