Digital Electronics:: Digital Concepts MCQs

Question 1

Digital signals transmitted on a single conductor (and a ground) must be transmitted in:

Accepted Answer

serial.

Answer

slow speed.

Answer

parallel.

Answer

analog.

Question 2

In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________.

Accepted Answer

25%

Answer

0%

Answer

50%

Answer

100%

Question 3

In positive logic, ________.

Accepted Answer

a HIGH = 1, a LOW = 0

Answer

a LOW = 1, a HIGH = 0

Answer

only HIGHs are present

Answer

only LOWs are present

Question 4

Convert the fractional binary number 0000.1010 to decimal.

Accepted Answer

0.625

Answer

0.50

Answer

0.55

Answer

0.10

Question 5

Digital representations of numerical values of quantities may BEST be described as having characteristics:

Accepted Answer

that vary in discrete steps in proportion to the values they represent.

Answer

that are difficult to interpret because they are continuously changing.

Answer

that vary constantly over a continuous range of

Answer

that vary in constant and direct proportion to the values they represent.

Question 6

A common instrument used in troubleshooting a digital circuit is a(n) ________.

Accepted Answer

all of the above

Answer

logic probe

Answer

oscilloscope

Answer

pulser

Question 7

The parallel transmission of digital data:

Accepted Answer

requires as many signal lines between sender and receiver as there are data bits.

Answer

is much slower than the serial transmission of data.

Answer

requires only one signal line between sender and receiver.

Answer

is less expensive than the serial method of data transmission.

Question 8

Convert the fractional decimal number 6.75 to binary.

Accepted Answer

0110.1100

Answer

0111.1100

Answer

0110.1010

Answer

0110.0110

Question 9

What is one relative disadvantage of serial transfer?

Accepted Answer

It is slow.

Answer

It requires too many conductors.

Answer

Its interconnect system is complex.

Answer

It can only be used over very short distances.