QUESTIONS AND CORRECT ANSWERS
Which of the following components is usually faulty in a voltage regular circuit? - CORRECT
ANSWER Zener diodes
Which is an advantage of an IC regulator over a multi component regulator? - CORRECT
ANSWER Internal thermal protection
Max current for the 7812 IC regulator? - CORRECT ANSWER 1.5A
Which block removes all ripple and gives a constant output? - CORRECT ANSWER 4,
regulator
An UJT turns on when the? - CORRECT ANSWER Input voltage exceeds a specified level
Purpose of UJT - CORRECT ANSWER To switch voltage
What happens to an SCR once it is turned on and the gate current is removed? - CORRECT
ANSWER SCR remains ON
Gate on schematic symbol of an SCR is connected to the? - CORRECT ANSWER Cathode
A UJT is on when? - CORRECT ANSWER Base 1 to emitter current flows
The operation of a basic UJT oscillator is based on? - CORRECT ANSWER RC time constant
Q1 turns on when? - CORRECT ANSWER The charge on C1 reaches Q1s turn on voltage
Q1 turns off when? - CORRECT ANSWER C1 discharges below turn-on voltage