Digital Electronics And Logic Design Set 14
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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