Solid State Devices Flashcards
This type of transistor bias consists of a resistor connected between the collector supply voltage and the base
Base current or fixed bias
A standard PN Junction diode has a ratio of one (1) impurity atom per 10 million semiconductor atoms. What type of diode commonly found in oscillators has a ratio of 1,000 impurity atoms to 10 million semiconductor atoms?
Tunnel Diode
A common collector amplifier has what type of output resistance?
Low
What is the formula for finding current gain in a common base BJT?
(IC2-IC1)/(IE2-IE1)
What is the maximum number of electrons allowed in the 4th shell of an atom (Pauli’s Exclusion Principle.)?
32
Which class of amplifier has the highest fidelity?
Class A
The greatest application of transistors is for use as what?
Amplifiers
Diodes used to mix signals together or detect the presence of a signal are referred to as what?
Signal Diodes
If the positive lead of a multimeter is connected to the “N” material and the negative lead to the “P” material of a PN junction diode, the depletion region will do what?
Increase
What are the least number diodes needed for a full-wave rectifier?
2
What solid state device is used to control both AC and DC power?
Thyristors
Why is a full wave rectifier more efficient than a half wave rectifier?
It uses both halves of the AC sine wave
Which statement best describes negative temperature coefficient?
As temperature goes up, resistance goes down
Which energy band will you never find electrons residing in it?
Forbidden Band
Which configuration of Bipolar Junction Transistor phase shifts the input signal 180 degrees at the output?
Common Emitter
What solid state device consists of three terminal leads made of one emitter and two base leads?
Unijunction Transistor (UJT)
What is the purpose of the base lead of a BJT?
Controls majority carriers
Which of the following is a valuable property of a solid state device?
Durability
To forward bias a NPN Transistor
Base +, Emitter -; Collector +, Emitter -
What solid state device consists of three terminal leads made of a source a gate and a drain?
JFET
Which class amplifier allows current to flow for approximately 180 degrees of input signal?
Class B
What solid state device consists of four leads made of a source, a gate, a drain and a substrate?
MOSFET
The “P” material of an NPN BJT corresponds to which lead?
Base
Which solid state device incorporates an LED that shines through a window onto a photosensitive device?
Optocoupler
Another name for the upper energy band of an atom is known as ?
The conductor band
What is the primary use for a Varactor diode?
communication circuits
Tunnel diodes have a “Negative Resistance Region.” Within this region, as biasing voltage __________, current flow __________.
Increases, Decreases
Which class of amplifier has the highest efficiency?
Class C
What is the percentage of gain of an amplifier with input power of 1 W and output power of 5 W?
500%
As a ____________ diode is conducting current, there is a spot where current decreases as the voltage across the diode increases.
Tunnel
What is the approximate forward bias voltage of a Silicon diode?
600mV
When a small part of the amplifier signal begins to oscillate from the output and is sent back to the input, this is known as________?
Feedback
During the doping process, if an impurity increases the number of holes in semiconductor material, the impurity is known as?
P-Type Material
Current in a transistor is controlled by?
Varying the voltage
On a common emitter amplifier, the output is on the ________ .
Collector
What is the primary use for a Zener diode?
Voltage control
What component is used as a switch to turn on or off small or large amounts of power and performs this function with no moving parts?
SCR
Which class amplifier allows current to flow for less than one half cycle of input signal?
Class C
What is the approximate forward bias voltage of a Germanium diode?
300mV
This type of transistor bias is best for improving stability.
Combination bias
A common base amplifier has what type of output resistance?
High
What is another term used for a Schottky diode?
Hot carrier diode
DC voltages or currents that exist in a circuit before the application of a signal are referred to as what?
Quiescent state voltages/currents
During the doping process, if an impurity increases the number of free electrons in semiconductor material, the impurity is known as?
N-Type material
Beta (transistor gain) is a comparison of collector current with respect to _______________ current.
Base
On a common collector amplifier, the output is on the ______ .
Emitter
The greatest application of tunnel diodes is for use as?
Oscillators
Which statement best describes Positive Temperature coefficient?
As temperature goes up, resistance goes up
To forward bias a PNP Transistor
Base -, Emitter+; Collector -, Emitter +
If the power source to a diode is connected so the voltage aids the junction, it will increase the junction barrier and offer high resistance to current flow. This is known as____________.
Reverse Bias
What is the formula for finding current gain in a common collector BJT?
(IE2-IE1)/(IB2-IB1)
How many contacts are associated with a BJT transistor?
3
______________ is the process of sharing valence electrons, resulting in the formation of crystals.
Covalent bonding
Amplifiers for increasing ___________ have a small load resistance.
Current
What is the formula for finding current gain in a common emitter BJT?
(IC2-IC1)/(IB2-IB1)
In order to prevent damage during shipping, what safety device is normally attached to the leads of a MOSFET?
Shorting spring
What type of material does not have a forbidden energy band or a very small forbidden energy band?
Conductor
On a common base amplifier, the input is on the ________ .
Emitter
How much forward bias is typically required for a Germanium (Ge) diode to begin to conduct?
0.3V
In a JFET, when resistance decreases-
Current flow increases
Which solid state device is used to directly convert light into electrical energy?
Photovoltaic Cell
In a rectifier circuit, to provide the best filtering of AC ripple, a capacitor should have a _______________ _______________ time constant is required.
Long discharging
Which class amplifier allows current to flow through 360 degrees of input signal?
Class A
What is the waveform referred to on an oscilloscope resulting from a half wave rectifier?
Pulsating DC
A common emitter amplifier has what type of output resistance?
Medium
The material used to construct an LED determines the diode’s what?
Color
What are transistors mostly used for in electronic circuits?
Switches
In a PN junction diode that is forward biased, as supply voltage increase what happens to current?
Increases
Which type of diode acts as a variable capacitor?
Varactor
What is the quiescent state of an amplifier?
The static operating (ready to work) point
