Digital Electronics and Logic Design MCQs with answers Page - 15

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

  • (A) ttlas
  • (B) cmos
  • (C) ecl
  • (D) ttlls

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Q. The fan Out of a 7400 NAND gate is

  • (A) 2ttl
  • (B) 5ttl
  • (C) 8ttl
  • (D) 10ttl

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Q. Which transistor element is used in CMOS logic?

  • (A) fet
  • (B) mosfet
  • (C) bipolar
  • (D) unijunctio n

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Q. CMOS circuits are extensively used for ON-chip computers mainly because of their extremely

  • (A) low power dissipation.
  • (B) high noise immunity.
  • (C) large packing density.
  • (D) low cost.

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Q. Which equation is correct?

  • (A) vnl = vil(max) + vol(max)
  • (B) vnh = voh(min) + vih(min)
  • (C) vnl = voh(min) – vih(min)
  • (D) vnh = voh(min) – vih(min)

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Q. The greater the propagation delay, the

  • (A) lower the maximum frequency
  • (B) higher the maximum frequency
  • (C) maximum frequency is unaffected
  • (D) minimum frequency is unaffected

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Q. For a CMOS gate, which is the best speed-power product?

  • (A) 1.4 pj
  • (B) 1.6 pj
  • (C) 2.4 pj
  • (D) 3.3 pj

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Q. In a TTL circuit, if an excessive number of load gate inputs are connected,

  • (A) voh(min) drops below voh
  • (B) voh drops below voh(min)
  • (C) voh exceeds voh(min)
  • (D) voh and voh(min) are unaffected

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Q. Which is not a MOSFET terminal?

  • (A) gate
  • (B) drain
  • (C) source
  • (D) base

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Q. An open-drain gate is the CMOS counterpart of

  • (A) an open- collector ttl gate
  • (B) a tristate ttl gate
  • (C) a bipolar junction transistor
  • (D) an emitter- coupled logic gate

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