Digital Electronics Set 1 MCQs

Q1 | Any number with an exponent of zero is equal to:

zero

one

that number

ten

Q2 | In the decimal numbering system, what is the MSD?

the middle digit of a stream of numbers

the digit to the right of the decimal point

the last digit on the right

the digit with the most weight

Q3 | Which of the following statements does NOT describe an advantage of digital technology?

the values may vary over a continuous range.

the circuits are less affected by noise.

the operation can be programmed.

information storage is easy.

Q4 | The generic array logic (GAL) device is ________.

one-time programmable

reprogrammable

a cmos device

reprogrammable and a cmos device

Q5 | The range of voltages between VL(max) and VH(min) are ________.

unknown

unnecessary

unacceptable

between 2 v and 5 v

Q6 | What is a digital-to-analog converter?

it takes the digital information from an audio cd and converts it to a usable form.

it allows the use of cheaper analog techniques, which are always simpler.

it stores digital data on a hard drive.

it converts direct current to alternating current.

Q7 | What are the symbols used to represent digits in the binary number system?

0,1

0,1,2

0 through 8

1,2

Q8 | A full subtracter circuit requires ________.

two inputs and two outputs

two inputs and three outputs

three inputs and one output

three inputs and two outputs

Q9 | The output of an AND gate is LOW ________.

all the time

when any input is low

when any input is high

when all inputs are high

Q10 | Give the decimal value of binary 10010.

610

910

1810

2010

Q11 | Parallel format means that:

each digital signal has its own conductor.

several digital signals are sent on each conductor.

both binary and hexadecimal can be used.

no clock is needed.

Q12 | A decoder converts ________.

noncoded information into coded form

coded information into noncoded form

highs to lows

lows to highs

Q13 | A DAC changes ________.

an analog signal into digital data

digital data into an analog signal

digital data into an amplified signal

none of the above

Q14 | The output of a NOT gate is HIGH when ________.

the input is low

the input is high

the input changes from low to high

voltage is removed from the gate

Q15 | The output of an OR gate is LOW when ________.

all inputs are low

any input is low

any input is high

all inputs are high

Q16 | Which of the following is not an analog device?

thermocouple

current flow in a circuit

light switch

audio microphone

Q17 | A demultiplexer has ________.

one data input and a number of selection inputs, and they have several outputs

one input and one output

several inputs and several outputs

several inputs and one output

Q18 | A flip-flop has ________.

one stable state

no stable states

two stable states

none of the above

Q19 | Digital signals transmitted on a single conductor (and a ground) must be transmitted in:

slow speed.

parallel.

analog.

serial.

Q20 | In a certain digital waveform, the period is four times the pulse width. The duty cycle is ________.

0%

25%

50%

100%

Q21 | Select the statement that best describes the parity method of error detection:

parity checking is best suited for detecting double-bit errors that occur during the transmission of codes from one location to another.

parity checking is not suitable for detecting single-bit errors in transmitted codes.

parity checking is best suited for detecting single-bit errors in transmitted codes.

parity checking is capable of detecting and correcting errors in transmitted codes.

Q22 | A logic circuit that provides a HIGH output for both inputs HIGH or both inputs LOW is a(n):

ex-nor gate

or gate

ex-or gate

nand gate

Q23 | A logic circuit that provides a HIGH output if one input or the other input, but not both, is HIGH, is a(n):

ex-nor gate

or gate

ex-or gate

nand gate

Q24 | Identify the type of gate below from the equation

ex-nor gate

or gate

ex-or gate

nand gate

Q25 | Parity systems are defined as either________ or ________ and will add an extra ________ tothe digital information being transmitted.

positive, negative, byte

odd, even, bit

upper, lower, digit

on, off, decimal