Question

Latches are commonly organized into groups of 4-bits, 8-bits or more into registers.

1 point

True

False

An asynchronous counter is one where all stages of the counter trigger together.

1 point

True

False

Pull-up resistors and special interface ICs are typically used as an interface between different logic families.

1 point

True

False

Which logic gate provides a low output only when an odd number of inputs are high?

1 point

and

or

exclusive OR

exclusive NOR

Which of the following measurements is not analog in nature?

1 point

speed

weight

data storage

pressure

Karnaugh mapping is an easy-to-use graphic method of simplifying Boolean expressions.

1 point

True

False

The heart of a voltage comparator is an operational amplifier.

1 point

True

False

Most newly designed electronic devices contain digital circuitry.

1 point

True

False

A mod-8 counter has how many different output states?

1 point

2

4

8

16

Digital-to-analog converters consist of a resistor network and a difference amplifier.

1 point

True

False

How many J-K flip-flops are needed to wire a modulo-16 counter?

1 point

one

two

four

eight

Decoders are _______________ logic circuits with several inputs and outputs.

1 point

inverted

encrypted

combinational

digital

In an unregulated power supply, if load current increases, the output voltage _________

1 point

Remains the same

Decreases

Increases

None of the above.

The clocked R-S flip-flop looks almost like an R-S flip-flop except that it has one extra input labeled CLK.

1 point

True

False

What is the 8421 BCD code equivalent for the decimal number 36?

1 point

0100 0110

0110 0011

0011 0110

0010 0100

A circuit that operates by using only high and low signals is called

1 point

a digital circuit

an analog circuit

a rectifier circuit

a filter circuit

In a synchronous counter it is necessary to have all stages of the counter trigger together.

1 point

True

False

The J-K flip-flop has the features of all the other types of flip-flops.

1 point

True

False

The Boolean expression A ∙ B + C ∙ D = Y is called the sum-of-products or what form?

1 point

maxterm

xor

nand

minterm

Op amps are characterized by high input impedance, low output impedance, and a variable voltage gain that is set

1 point

at the manufacturer

with external resistors

with internal capacitors

with external inductors

Integrated circuits within a logic family are designed to interface easily with one another.

1 point

True

False

A counter that counts from lower to higher numbers is called an up counter.

1 point

True

False

The 8421 binary-coded decimal code is frequently referred to as the BCD code.

1 point

True

False

The LED is nothing like a PN-junction diode.

1 point

True

False

The D/A converter converts analog information to digital data.

1 point

True

False

Excellent noise immunity is a characteristic of which logic family?

1 point

CMOS

DDL

TTL

RTL

Applying 1.6 V to a TTL input is interpreted by the IC as what logic level?

1 point

high

low

undefined

undetermined

Minterm Boolean expressions are used to create which logic circuits?

1 point

nor-nor

nor-nand

nand-nor

and-or

The binary number system is sometimes called the

1 point

base 2 system

base 8 system

base 10 system

base 16 system

Which logic circuit law allows for the back and forth conversion from minterm to maxterm forms of Boolean expressions?

1 point

Kirchhoff

Karnaugh

De Morgan

Fourier

If the light intensity on the photocell is reduced, which of the following results

1 point

resistance of the photocell decreases

resistance of the photocell increases

increase in current through series resistances R2 and R3

an increase in the reading at the binary outputs

The basic building block for sequential logic is the logic gate.

1 point

True

False

Digital signals are composed of two well-defined voltage levels.

1 point

True

False

This is the logic symbol for a(n)

1 point

AND gate

NOT gate (inverter)

OR gate

ANAND gate

What is the decimal number for the BCD number 0010 1001 0111?

1 point

279

479

297

497

The invert bubble at the clock input of a D flip-flop

1 point

shows the triggering occurs on the negative-going edge of the clock

shows the triggering occurs on the positive-going edge of the clock

causes the clock signal to be 180° out of phase

disables the clock signal

The truth table for three variables has how many possible combinations?

1 point

2

4

8

16

The most widely used rectifier is___

1 point

half-wave rectifier

centre-tap full wave rectifier

bridge full-wave rectifier

none of the above

A very common output device used to display decimal numbers is the seven-segment display.

1 point

True

False

The unique output of the NAND function is a low output only when all inputs are low.

1 point

True

False

The D flip-flop has only one data input and a clock input.

1 point

True

False

4. Which of the following is not related to digital systems?

1 point

calculations

data manipulation

alphanumeric outputs

position measurements

Answer 1