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This set of Digital Electronics and Logic Design Multiple Choice Questions & Answers (MCQs) focuses on Digital Electronics And Logic Design Set 7

Q1 | Which of the following is the fastest logic
  • ttl
  • ecl
  • cmos
  • lsi
Q2 | The digital logic family which has the lowest propagation delay time is
  • ecl
  • ttl
  • cmos
  • pmos
Q3 | Which TTL logic gate is used for wired ANDing
  • open collector output
  • totem pole
  • tri state output
  • ecl gates
Q4 | CMOS circuits consume power
  • equal to ttl
  • less than ttl
  • twice of ttl
  • thrice of ttl
Q5 | In a positive logic system, logic state 1 corresponds to
  • positive voltage
  • higher voltage level
  • zero voltage level
  • lower voltage level
Q6 | The commercially available 8-input multiplexer integrated circuit in the TTL family is
  • 7495
  • 74153
  • 74154
  • 74151
Q7 | The logic 0 level of a CMOS logic device is approximately
  • 1.2 volts
  • 0.4 volts
  • 0volts
  • 5volts
Q8 | Which ofthe following is a universal logic gate?
  • or
  • xor
  • and
  • nand
Q9 | How is the noise margin of a logic family defi ned?
  • voh – vol
  • greater of vdd – vohand vol – gnd
  • smaller of vil – voland voh – vih
  • vih – vil.
Q10 | What parameter causes the main limit on fan-out of CMOS logic in high-speed applications?
  • d.c. input current
  • output current
  • input capacitance
  • power supply voltage.
Q11 | The number of standard loads that the output of the gate can drive with out impairment of its normal operation is
  • fan-in
  • fan-out
  • noise-margin
  • power- dissipiatio n
Q12 | Measure of power consumed by the gate when fully driven by all its inputs is
  • fan-in
  • fan-out
  • noise-margin
  • power- dissipiatio n
Q13 | Fan-out is specified in terms of
  • voltage
  • current
  • watt
  • unit load
Q14 | Which of the following logic family has highest fan-out
  • dtl
  • cmos
  • rtl
  • ttl
Q15 | Which of following consume minimum power
  • ttl
  • rtl
  • dtl
  • cmos
Q16 | Among the logic families, low power dissipation is in
  • dtl
  • cmos
  • rtl
  • ttl
Q17 | The temperature in which the performance of the IC is effective
  • operating
  • fan-out
  • normal
  • power-
Q18 | The nominal value of the dc supply voltage for TTL (transistor-transistorlogic) devices is
  • 0v
  • 5v
  • 10v
  • 15v
Q19 | The average transition delay time for the signal to propagate from input to output when the signals change in value. It is expressed in ns is
  • propogation delay
  • fan-out
  • noise-margin
  • power- dissipiatio n
Q20 | the number of inputs connected to the gate without any degradation in the
  • propogation delay
  • fan-out
  • fan- in
  • power- dissipiatio
Q21 | Which of the following logic gives the complementary outputs?
  • ecl
  • ttl
  • cmos
  • pmos
Q22 | The maximum noise voltage added to an input signal of a digital circuit
  • fan-in
  • fan-out
  • noise-margin
  • power-
Q23 | Among the logic families, Slowest logic family is
  • ttl
  • rtl
  • dtl
  • cmos
Q24 | Operating temperature of the IC vary from
  • 0 to70 celsius
  • 0to35celsius
  • 0to 50celsius
  • 0to70celsi
Q25 | 1. Open collector output 2. Totem-Pole Output 3. Tri-state output are thetype of
  • ttl logic
  • rtl logic
  • cmos logic
  • none ofthis