Online Digital Electronics Test - Digital Electronics Test - Random

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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The octal number for binary 1101110101110110 is ________.

654521₈

556561₈

156656₈

156566₈

[#]

A binary number with four digits has a maximum value of 15.

True

False

[#]

Whenever information is transmitted from one device to another, there is a possibility that ________.

one device is off

errors will occur

there is a full moon

the data will be received as transmitted

[#]

How many inputs of a four-input AND gate must be HIGH in order for the output of the logic gate to go HIGH?

any one of the inputs

any two of the inputs

any three of the inputs

all four inputs

[#]

A waveform can be enabled or disabled by both AND and OR gates.

True

False

[#]

In VHDL, each instance of a component is given a name followed by a semicolon and the name of the library primitive.

True

False

[#]

The major advantage of a Schmitt trigger input is that it ________.

avoids erratic triggering

has more triggering methods

has a wider range of outputs

can be retriggered

[#]

Shift registers are used to store and transfer data.

True

False

[#]

PIA is an acronym for ________.

Programmable Interface Array

Post Integrated Array

Programmable Input Array

Programmable Interconnect Array

[#]

10.

Which of the following is not a basic element within the microprocessor?

Microcontroller

Arithmetic logic unit (ALU)

Control unit

[#]

11.

One output structure of a TTL gate is often referred to as a ________.

totem-pole arrangement

diode arrangement

JBT arrangement

base, emitter, collector arrangement

[#]

12.

Subtract the following binary numbers.

0101 1000		1010 0011		1101 1110
–0010 0011		–0011 1000		–0101 0111

0011 0100 0110 1010 1000 0110

0011 0101 0110 1011 1000 0111

0011 0101 0110 1010 1000 0111

0011 0101 0110 1010 1000 0110

[#]

13.

The IEEE/ANSI notation of an internal underlined diamond denotes:

totem-pole outputs.

open-collector outputs.

quadrature amplifiers.

tristate buffers.

[#]

14.

A ________ is a testing and troubleshooting tool that generates a short-duration pulse when manually activated, usually by depressing a push button.

cattle prod

jimmy rod

logic pulser

bilateral switch

[#]

15.

The outputs of a 7485 four-bit magnitude comparator when the inputs are A = 0110 and B = 1010 are:

A < B is 1
A = B is 0
A > B is 1

True

False

[#]

16.

A VARIABLE can be thought of as a piece of scrap paper used to write down some numbers that can be used later.

True

False

[#]

17.

Another name for a multiplexer is ________.

encoder

decoder

code converter

data selector

[#]

18.

A(n) ________ converts an analog input to a digital output.

ADC

DAC

flash converter

bipolar converter

[#]

19.

In a graphical representation of voltage versus time, ________ is displayed on the ________ axis and ________ is displayed on the ________ axis.

time, y, voltage, x

voltage, y, time, x

[#]

20.

When extremely critical timing is required, a quartz crystal can be used.

True

False

[#]

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Online Digital Electronics Test - Digital Electronics Test - Random

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