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This set of Digital Electronics and Logic Design Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics And Logic Design Set 14

Q1 | The inverter OR-gate and AND gate are called deeision-making elementsbecause they can recognize some input while disregarding others. A gate
  • words,high
  • bytes,low
  • bytes,high
  • character,low
Q2 | Which one of the following set of gates are best suited for 'parity' checking and 'parity' generation.
  • and, or, notgates
  • ex-nor orex-or gates
  • nand gates
  • norgates
Q3 | How many inputs are required for a 1-of-10 BCD decoder?
  • 4
  • 8
  • 10
  • 1
Q4 | Most demultiplexers facilitate which of the following?
  • decimal to hexadecimal
  • single input, multiple outputs
  • ac to dc
  • odd parity to even parity
Q5 | One application of a digital multiplexer is to facilitate:
  • code conversion
  • parity checking
  • parallel-to- serial data conversion
  • data generation
Q6 | Select one of the following statements that best describes the parity method of error detection:
  • best suited for detecting single-bit errors in transmitted codes.
  • best suited for detecting double-bit errors that occur during the transmission of codes from one location to another.
  • a and b
  • none of the above
Q7 | A multiplexed display:
  • accepts data inputs from one line and passes this data to multiple output lines
  • uses one display to present two or more pieces of information
  • accepts data inputs from multiple lines and passes this data to multiple output lines
  • accepts data inputs from several lines and multiplexe s this input data to four bcd lines
Q8 | In which of the following gates, the output is 1, if and only if at least one input is 1?
  • nor
  • and
  • or
  • nand
Q9 | The time required for a gate or inverter to change its state is called
  • rise time iz
  • decay time
  • propagation time
  • charging time
Q10 | The time required for a pulse to change from 10 to 90 percent of its maximum value is called
  • rise time iz
  • decay time
  • propagation time
  • operating speed
Q11 | The maximum frequency at which digital data can be applied to gate is called
  • operating speed
  • propagation speed
  • binary level transaction period
  • charging time
Q12 | What is the minimum number of two-input NAND gates used to perform the function of two input OR gate ?
  • one
  • two
  • three
  • four
Q13 | The time required for a pulse to decrease from 90 to 10 per cent of its maximum value is called
  • rise time
  • decay time
  • binary level transition period
  • propagatio n delay
Q14 | Which of the following gates would output 1 when one input is 1 and other input is 0 ?
  • or gate
  • and gate
  • nand gate
  • and gate
Q15 | Which of the following expressions is not equivalent to X ' ?
  • x nand x
  • x nor x
  • x nand 1
  • x nor 1
Q16 | Which of the following gates are added to the inputs of the OR gate to convert it to the NAND gate ?
  • not
  • and
  • or
  • xor
Q17 | The EXCLUSIVE NOR gate is equivalent to which gate followed by an inverter ?
  • or gate
  • and
  • nand
  • xor
Q18 | Which of the following gates is known as coincidence detector ?
  • and gate
  • or gate
  • not gate
  • nand gate
Q19 | Which table shows the logical state of a digital circuit output for every possible combination of logical states in the inputs ?
  • function table
  • truth table
  • routing table
  • ascii table
Q20 | A positive AND gate is also a negative
  • nand gate
  • nor gate
  • and gate
  • or gate
Q21 | An OR gate can be imagined as
  • switches connected in series
  • switches connected in parallel
  • mostransistors connected in series
  • none of these
Q22 | Which combination of gates does not allow the implementation of an arbitrary boolean function?
  • or gates and and gates only
  • or gates and exclusive or gate only
  • or gates and not gates only
  • nandgates only
Q23 | The output of NOR gate is
  • high if all of its inputs are high
  • low if all of its inputs are low
  • high if all of its inputs are low
  • high if only of its inputs is low
Q24 | A toggle operation cannot be performed using a single
  • nor gate
  • and gate
  • nand gate
  • xor gate
Q25 | Which table shows the electrical state of a digital circuit's output for every possible combination of electrical states in the inputs ?
  • function table
  • truth table
  • routing table
  • ascii table