Digital Electronics and Logic Design MCQs with answers Page - 30

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

  • (A) the schottky- clamped transistor
  • (B) nothing. the 74xx series uses less power.
  • (C) a larger value resistor
  • (D) using nand gates

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

  • (A) the 5400 series are military grade and require tighter supply voltages and temperatures.
  • (B) the 5400 series are military grade and allow for a wider range of supply voltages and temperature s.
  • (C) the 7400 series are an improvement over the original 5400s.
  • (D) the 7400 series was originally developed by texas instrumen ts. the 5400 series was brought out by national semicondu ctors after tis patents expired, as a second supply source.

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Q. Which of the following statements apply to CMOS devices?

  • (A) the devices should not be inserted into circuits with the power on.
  • (B) all tools, test equipment, and metal workbenches should be tied to earth ground.
  • (C) the devices should be stored and shipped in antistatic tubes or conductive foam.
  • (D) all of the above.

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Q. Which of the logic families listed below allows the highest operating frequency?

  • (A) 74as
  • (B) ecl
  • (C) hcmos
  • (D) 54s

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Q. What is the increase in switching speed between 74LS series TTL and 74HC/HCT (High-Speed CMOS)?

  • (A) 5
  • (B) 10
  • (C) 50
  • (D) 100

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Q. What does ECL stand for?

  • (A) electron- coupled logic;
  • (B) emitter- coupled logic;
  • (C) energy- coupled logic;
  • (D) none of above

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Q. What is unique about TTL devices such as the 74S00?

  • (A) the gate transistors are silicon (s), and the gates therefore have lower values of leakage current.
  • (B) the s denotes the fact that a single gate is present in the ic rather than the usual package of 2–6 gates.
  • (C) the s denotes a slow version of the device, which is a consequence of its higher power rating.
  • (D) the devices use schottky transistors and diodes to prevent them from going into saturation; this results in faster turn on and turn off times, which translates into higher frequency operation.

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Q. he bipolar TTL logic family that was developed to increase switching speed by preventing transistor saturation is:

  • (A) emitter- coupled logic (ecl).
  • (B) current- mode logic (cml).
  • (C) transistor- transistor logic (ttl).
  • (D) emitter- coupled logic (ecl) and transistor- transistor logic (ttl).

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Q. In TTL the noise margin is between

  • (A) 0.4 v and 0.8 v.
  • (B) 0.0 v and 0.4 v.
  • (C) 0.0 v and 0.5 v.
  • (D) 0.0v and 0.8 v.

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Q. What is the transitive voltage for the voltage input of a CMOS operating from 10V supply

  • (A) 1v
  • (B) 5v
  • (C) 10v
  • (D) 15v

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