Logic Families and Their Characteristcs Questions and Answers

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Logic Families and Their Characteristics questions with answers are an important part of digital electronics aptitude. Understanding TTL, CMOS, and ECL logic families is vital for solving problems in timing, voltage levels, and power consumption. Exams like GATE, DRDO, and ISRO frequently include such questions to test a student’s grasp of digital circuit behavior. This section provides well-structured aptitude questions with step-by-step solutions, helping students compare logic families and analyze their performance parameters. Strengthen your understanding of digital systems through these practice problems and prepare effectively for competitive exams.

Logic Families and Their Characteristcs

Showing 10 of 47 questions

41. How can ECL have both a NOR and an OR output?

  • ECL does not have this feature.
  • They are simply the inverse of each other.
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42. Which logic family is characterized by a multiemitter transistor on the input?

  • ECL
  • CMOS
  • TTL
  • None of the above
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43. How is the speed–power product of a logic family determined?

  • The propagation delay in s is multiplied by the power dissipation in mW.
  • The propagation delay in ms is multiplied by the power dissipation in W.
  • The propagation delay in ns is multiplied by the power dissipation in mW.
  • The propagation delay in ns is multiplied by the power dissipation in W.
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44. The problem of the VOH(min) of a TTL IC being too low to drive a CMOS circuit and meet the CMOS requirement of VIH(min) is usually easily overcome by:

  • adding a fixed voltage-divider bias resistive network at the output of the TTL device
  • avoiding this condition and only using TTL to drive TTL
  • adding an external pull-down resistor to ground
  • adding an external pull-up resistor to VCC
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45. How does the 4000 series of CMOS logic compare in terms of speed and power dissipation to the standard family of TTL logic?

  • more power dissipation and slower speed
  • more power dissipation and faster speed
  • less power dissipation and faster speed
  • less power dissipation and slower speed
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46. What should be done with unused inputs to a TTL NAND gate?

  • let them float
  • tie them LOW
  • tie them HIGH
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47. The TTL HIGH level source current is higher than the LOW level sinking current.

  • TRUE
  • FALSE
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