Digital Electronics MCQ Questions Electrical Engineering

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About Digital Electronics

Below are best multiple choice questions on Digital Electronics along with answers that help you to revise your Digital Electronics skills before exams.

Digital Electronics MCQ Questions With Answers

Q1. What is ripple carry adder?

  • the carry output of the lower order stage is connected to the carry input of the next higher order stage
  • the carry input of the lower order stage is connected to the carry output of the next higher order stage
  • the carry output of the higher order stage is connected to the carry input of the next lower order stage
  • the carry input of the higher order stage is connected to the carry output of the lower order stage

Q2. What is the maximum possible range of bit-count specifically in n-bit binary counter consisting of ‘n’ number of flip-flops?

  • 0 to 2n
  • 0 to 2n + 1
  • 0 to 2n – 1 d) 0 to 2n+1/2
  • none of the above

Q3. What is the difference between a shift-right register and a shift-left register?

  • there is no difference
  • the direction of the shift
  • propagation delay
  • the clock input

Q4. What is the preset condition for a ring shift counter?

  • all ffs set to 1
  • all ffs cleared to 0
  • a single 0, the rest 1
  • a single 1, the rest 0

Q5. How many 16K * 4 RAMs are required to achieve a memory with a capacity of 64K and a word length of 8 bits?

  • 2
  • 4
  • 6
  • 8

Q6. What must be done to interface TTL to CMOS?

  • a dropping resistor must be used on the cmos of 12 v supply to reduce it to 5 v for the ttl
  • as long as the cmos supply voltage is 5 v they can be interfaced (however, the fan- out of the ttl is limited to five cmos gates)
  • a 5 v zener diode must be placed across the inputs of the ttl gates in order to protect them from the higher output voltages of the cmos gates
  • a pull-up resistor must be used between the ttl output-cmos input node and vcc; the value of rp will depend on the number of cmos gates connected to the node

Q7. What causes low-power Schottky TTL to use less power than the 74XX series TTL?

  • the schottky-clamped transistor
  • a larger value resistor
  • the schottky-clamped mosfet
  • a small value resistor

Q8. What are the major differences between the 5400 and 7400 series of ICs?

  • the 5400 series are military grade and require tighter supply voltages and temperatures
  • the 5400 series are military grade and allow for a wider range of supply voltages and temperatures
  • the 7400 series are an improvement over the original 5400s
  • the 7400 series was originally developed by texas instruments and the 5400 series was brought out by national semiconductors after ti’s patents expired as a second supply source

Q9. How many select lines would be required for an 8-line-to-1-line multiplexer?

  • 2
  • 4
  • 8
  • 3

Q10. A 4-bit R/2R ladder digital-to-analog converter uses ________.

  • one resistor value
  • two resistor values
  • three resistor values
  • four resistor values

Q11. In which of the following base systems is 123 not a valid number?

  • Base 10
  • Base 16
  • Base 8
  • Base 3

Q12. The number of Boolean functions that can be generated by n variables is equal to

  • 2n
  • 22n
  • 2n-1
  • 2n

Q13. The only function of NOT gate is to ___________.

  • Stop signal
  • Invert input signal
  • Act as a universal gate
  • None of the above

Q14. In Boolean algebra, the bar sign (-) indicates ___________.

  • OR operation
  • AND operation
  • NOT operation
  • None of the above

Q15. The inputs of a NAND gate are connected together. The resulting circuit is ___________.

  • OR gate
  • AND gate
  • NOT gate
  • None of the above

Q16. Which is a typical application of digital signal processing?

  • noise elimination
  • music signal processing
  • image processing
  • all of the above

Q17. A NAND gate is called a universal logic element because

  • It is used by everybody
  • Any logic function can be realized by NAND gates alone
  • All the minization techniques are applicable for optimum NAND gate realization
  • Many digital computers use NAND gates.

Q18. Among the logic families, the family which can be used at very high frequency greater than 100 MHz in a 4 bit synchronous counter is

  • CMOS
  • ECL

Q19. In the boolean algebra, a variable has ________ different state(s)/value(s).

  • 3
  • 1
  • 2
  • 4

Q20. Which type of CPLD packaging can provide maximum number of pins on the package due to small size of the pins?

  • PLCC
  • QFP
  • PGA
  • BGA

Q21. An AND gate will function as OR if

  • All the inputs to the gates are “1”
  • All the inputs are ‘0’
  • Either of the inputs is “1”
  • All the inputs and outputs are complemente'

Q22. Most of the digital computers do not have floating point hardware because

  • Floating point hardware is costly
  • It is slower than software
  • It is not possible to perform floating point addition by hardware
  • Of no specific reason

Q23. Which is the example of digital device from the given option ?

  • Record players
  • Microprocessors
  • Sensors
  • Thermistors

Q24. Which of the following is Universal Gate?

  • OR gate
  • NAND gate
  • AND gate
  • NOR gate

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