Chapter 9 Homework
Compared to the collector and emitter, the base region of a bipolar junction transistor is large.
f
IGBTs have a higher on-state power loss than MOSFETs.
f
The most important operating characteristic of a diode is that it allows current flow through it in both directions.
f
In a bipolar transistor circuit, the collector current is typically much lower than the base current.
false wrong-t
An ohmmeter test of a diode shows a high resistance reading in both directions. This is an indication that the diode is
faulted open
When voltage is applied across a diode in such a way that the diode allows current to flow, the diode is said to be
forward biased
Digital circuits are constructed from electronic circuits known as logic __________.
gates
Current flow between the main terminals of a triac is
in either direction
An integrated circuit (IC) is a
miniaturized electronic circuit fabricated into a single silicon chip
SCRs usually fail shorted as indicated by an ohmmeter resistance reading from anode-to-cathode that
near zero in both directions
A diode consists of a __________- type and __________- type semiconductor materials formed on a single component.
p,n
The gate of a JFET consists of a reverse -biased junction, whereas the gate of a MOSFET consists of a metal electrode insulated from the channel.
reverse
High current SCRs have provisions for some type of heat sink to dissipate the heat.
sink
The purpose of a power supply filter is to
smooth out the DC voltage from the diode rectifier circuit wrong- produce a cleaner form of the original AC input voltage
Which type of three-wire sensor is shown?
sourcing
A logic gate performs a logical operation on one or more logical inputs and produces a single logical output.
t
A microcontroller is an integrated circuit which functions as a complete computer on a chip.
t
A transistor is used to amplify a signal or switch a circuit on and off.
t
A triac can serve as the switching device for a programmable logic controller AC output module.
t
All field-effect transistors are unipolar in that their working current flows through only one type of semiconductor material.
t
All field-effect transistors use basically no input current as the output current flow is controlled by an electric field rather than an electric current.
t
Electrostatic discharge (ESD) is the release of static electricity when two objects come into contact.
t
ICs are favored for low voltage and current applications.
t
IGBTs have faster switching speeds BJTs.
t
Logic is the ability to make decisions based on one or more different factors before an action is taken.
t
Thyristors are mainly used where high currents and voltages are involved.
t
The PNP transistor is the complement of the NPN transistor. This means that
the two are electrically similar except that opposite current and voltages are involved
A logic ________ table shows the output for each possible input.
truth
A Darlington transistor combines __________ into a single device.
two transistors
The insulated gate bipolar transistor is a cross between a __________ and __________ transistor.
BJT, MOSFET
Which of the following types of digital signals provides a single piece of information?
Bit
How is a silicon-controlled rectifier similar to a diode rectifier
Both conduct current in one direction only.
A(n) __________ microcontroller is one that is physically built into the device it controls.
embedded
Diode rectifiers are used in the changing of AC to DC .
AC, DC
Digital logic circuits have __________ states.
2
Which of the following field effect transistors is "normally off" in that if a voltage is connected to the drain and source and no voltage is connected to the gate, there will be no current flow through the device?
Enhancement mode MOSFET
An inverter and rectifier perform the same function.
f
An ohmmeter test of a diode shows a low resistance reading in both directions. This is an indication that the diode is open.
f
A light emitting diode (LED) will
all of these
A zener diode
all of these
Compared to mechanical switching circuits, transistor switching circuits
all of these
An operational amplifier (op-amp) would be classified as
an analog IC
Always transport and store sensitive ICs and control boards in __________ packaging.
antistatic
The three leads of a bipolar transistor are the
base, collector, and emitter
The DC output voltage of a diode rectifier circuit can be smoothed out by means of a
capacitor connected in parallel with the output
Which of the following building blocks of an electronic motor control system takes command of motor starting, stopping, speed and protection?
controller
The resultant _________ flow from ESD can generate damaging heat within an IC.
current
A DIAC is designed to conduct current in
either direction when its rated voltage is exceeded