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This set of Digital Electronics Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics Set 1

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