Electronics Final Flashcards
How many layers are in a BJT ?
3
When testing a Good triac between MT2 and MT1 and gate disconnected, should read ?
OL both directions
Does the arrow in a PNP point positive to negative ? True or false
True. Points from P-N
If NO current is conducted at the base, then current can’t flow, what mode is this ?
Cutoff Mode
When a transistor is used as an amplifier it is biased into ________\ mode of operation
Active mode
When a transistor is fully on and current flow between collector and emitter is at maximum, what mode ?
Saturation mode
When testing a good BJT what is the voltage drop from base to emitter
0.7v
To turn on a NPN transistor, the voltage at the base must be more __________ then the emitter
Positive
To turn on a PNP transistor the voltage must be more ___________ then the emitter
Negative
Polarity of the collector on an NPN transistor
Positive
Polarity of the collector on a PNP transistor ?
Negative
What are two general applications where a transistor is used ?
Switching or Amplifications
A diode is tested and measured 0V in forward, and 0V in reverse, the diode is ________?
Failed short
To turn off an SCR the anode current must be reduced below the devices ________ current
Holding
Three terminals on a BJT
Collector, Emitter, Base
3 terminals on a JFET
Gate, Drain, Source
What are two types of doping, used in a semiconductor?
P type
N type
Which direction do electrons flow with respect to voltage polarity ?
Positive - negative
How many layers in a single diode ?
2
To turn on a N-channel EMosfet the voltage at the gate must be more ________ then the source terminal
Positive
The polarity of the drain voltage on a NChan FET is _____?
Positive
The polarity of the drain on a P-Channel FET is ________?
Negative
What type of MOSFET operates like a normally open switch ?
E mosfet
What transistor family has the highest power rating ?
IGBT
What device family is the SCR?
Thyristors
What forward and reverse measurement are expected when testing a SCR with its gate disconnected?
Open cct
Decreasing the base current in a BJT will cause impedance to _______?
Increase
To trigger a thyristor later then 90’ in a ac cycle, the gate must be phase shifted with a _________?
Capacitor
The voltage that causes a diode to conduct in a reverse direction is what ?
Peak inverse voltage
How many valence electrons do P type dopants have ?
3
To turn on a SCR the anode must be made more ___________ then the cathode, and gate current must be ___________.
Positive & positve
What terminal does a gate have to be connected to when testing a TRIAC?
T2
Testing a BJT, base to collector = ________ voltage drop
OL
Testing a BJT base to emitter = _______ voltage drop
.7v
How many layers in a thyristor ?
4 layers
Thyristor are latching devices, once triggered into ON state, they remain ON until current flow is reduced below _________ current
Holding
Three terminals on a UJT
Base 1 , base 2, emitter
3 terminals on a SCR ?
Anode, cathode, gate
SCRS can only operate in _________ direction
Forward
To turn on a SCR, ______voltage and current are applied to the gate with respect to cathode
Positve
SCR with gate disconnected will measure what?
OL in either direction
IN a SCR gate to cathode should register a voltage drop of ?
.7
Jeff’s drug of choice ?
Percocet
