Digital Electronics and Logic Design MCQs with answers Page - 17

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Q. What is the major advantage of ECL logic?

  • (A) very high speed
  • (B) wide range of operating voltage
  • (C) very low cost
  • (D) very high power

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Q. As a general rule, the lower the value of the speed–power product, the better the device because of its:

  • (A) long propagation delay and high power consumption
  • (B) long propagation delay and low power consumption
  • (C) both
  • (D) none of above

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Q. What is the difference between the 54XX and 74XX series of TTL logic gates?

  • (A) 54xx is faster.
  • (B) 54xx is slower.
  • (C) 54xx has a wider power supply and expanded temperature range.
  • (D) 54xx has a narrower power supply and contracted temperatu re range.

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Q. What is the range of invalid TTL output voltage?

  • (A) 0.0–0.4 v
  • (B) 0.4–2.4 v
  • (C) 2.4–5.0 v
  • (D) 0.0–5.0 v

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Q. An open collector output can current, but it cannot .

  • (A) sink, source current
  • (B) source, sink current
  • (C) sink, source voltage
  • (D) source, sink voltage

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Q. Why is a decoupling capacitor needed for TTL ICs and where should it be connected

  • (A) to block dc, connect to input pins
  • (B) to reduce noise, connect to input pins
  • (C) to reduce the effects of noise, connect between power supply and ground
  • (D) none of above

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Q. Which of the following summarizes the important features of emitter- coupled logic (ECL)?

  • (A) low noise margin, low output voltage swing, negative voltage operation, fast, and high power consumption
  • (B) good noise immunity, negative logic, high- frequency capability, low power dissipation, and short propagation time
  • (C) low propagation time, high- frequency response, low power consumption, and high output voltage swings
  • (D) poor noise immunity, positive supply voltage operation, good low- frequency operation, and low power

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Q. Why is a pull-up resistor needed for an open collector gate?

  • (A) to provide vcc for the ic
  • (B) to provide ground for the ic
  • (C) to provide the high voltage
  • (D) to provide the low voltage

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Q. Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?

  • (A) to increase the output low voltage
  • (B) to decrease the output low voltage
  • (C) to increase the output high voltage
  • (D) to decrease the output high voltage

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Q. The word "interfacing" as applied to digital electronics usually means:

  • (A) a conditioning circuit connected between a standard ttl nand gate and a standard ttl or gate
  • (B) a circuit connected between the driver and load to condition a signal so that it is compatible with the load
  • (C) any gate that is a ttl operational amplifier designed to condition signals between nmos transistors
  • (D) any ttl circuit that is an input buffer stage

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