ch 1 & 2 digital

Digital signals have voltage levels that generally range from

0 V to 5 V

The binary number 1011 is equal to the decimal number

11

A word contains

16 bits

What is the octal equivalent to the decimal number 15?

17

For TTL, the logic probe will indicate a high for

2 V or greater

What is the decimal equivalent to the hexadecimal number FF?

255

What is the decimal equivalent for the hexadecimal number 2F?

47

Which of the following is a prime number?

5

The function of the oscilloscope is to graph signal versus input voltage.

False

The hexadecimal number system uses 10 symbols.

False

To toggle means to switch over to an opposite state.

True

To use a function generator, the shape of the waveform must be selected first.

True

The binary number system is sometimes called the

base 2 system

In computer software, to encode means to convert encrypted codes into readable numbers or text.

False

In modern electronic systems, the encoding and decoding may be performed only by software.

False

Latch circuits are sometimes called amplifiers.

False

On an oscilloscope, time is the vertical distance on the screen and voltage is the horizontal deflection.

False

The binary number 101010 equals 25 in decimal.

False

A 64-bit group of data is called a nibble.

False

A bi-stable multivibrator is often referred to as a clock.

False

A digital device is one that has a signal which varies continuously in step with the input.

False

An 8-bit binary number is called a bit.

False

A decoder is a logic device that translates from binary code to decimal.

True

A portable measuring device used to determine output logic levels is the analog voltmeter.

True

A quad-word contains 64 bits.

True

Digital circuitry is almost always unaffected by unwanted electrical interference called noise.

True

Digital electronic devices use a number system called the binary number system.

True

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

True

Generally the weight or value of each place in the binary number system is referred to as a power of two.

True

Hexadecimal notation is widely used in microprocessor-based systems to represent 4-, 8-, 16-, 32-, or 64-bit binary numbers.

True

If neither indicators of a logic probe light, it usually means the voltage is between high and low in an area known as the undefined region.

True

In the hexadecimal number system, the letter A stands for decimal ten.

True

Most newly designed electronic devices contain digital circuitry.

True

Octal numbers are also referred to as base eight numbers.

True

The DMM is an example of digital circuitry taking over tasks previously performed only by analog devices.

True

Which of the following is an advantage of the octal number system?

it is used extensively to convert directly from a 3-bit binary number

Analog electronic devices use a number system called binary.

False

A single binary number (either a 0 or a 1) is called a

bit

Useful information transmitted within, to, or from electronics is referred to as

a signal

A volt-ohm-millimeter is an example of

an analog measuring device

The device that translates from keyboard decimal numbers to binary is called

an encoder

A test instrument that graphs time versus input voltage is

an oscilloscope

A 150- resistor in an LED output circuit keeps the _______________ at a safe level.

current

Which of the following measurements is not analog in nature?

data storage

The repeated divide-by-2 process is used when you want to convert

decimal to binary

Which of the following is not an advantage of using digital circuitry over analog circuitry?

digital circuits are manufactured at a fraction of the cost

The _______________ circuit is another name for the bi-stable multivibrator.

latch

A one-shot multivibrator is another name for the _______________ multivibrator.

monostable

Which of the following is not related to digital systems?

position measurements

When working with varied number systems, what type calculator should be used?

scientific

To solve the problem of _______________ bounce, a debouncing circuit is generally added.

switch

The power to operate the logic probe comes from _________.

the device you are testing

The _______________ region between high and low may cause trouble in digital circuits and should be avoided.

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Voltages between about 0.8 V and 2 V are in the _______________ region and signal trouble in TTL circuits.

undefined

Output voltages from a digital circuit can be measured with a standard _______________.

voltmeter

Analog electronic signals are usually generated and processed by integrated circuits.

False

Calculators and computers understand only decimal numbers.

False

The decimal number system uses only two symbols 0 and 1.

False

The hexadecimal number system uses 18 symbols.

False

Time is on the vertical distance on the screen of an oscilloscope.

False

Digital voltage levels that range from near 0 V for low and +3 V to +5 V for high are commonly called

TTL

The binary number 1100 represents the decimal number 12.

True

The central processing unit of a computer can manipulate the input data, output the information, store the information and calculate results when required.

True

The monostable multivibrator responds to an input trigger pulse with an output pulse of a given width.

True

The octal number system uses 8 symbols.

True

The pulse width generated by a one-shot multivibrator is dependent on the design of the RC time constant.

True

Which of the following is not a sign that a device contains digital circuitry?

a CRT display

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

a digital circuit

A code that uses symbols to refer to a number of items is called

a number system