Chapter 9 Homework

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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


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