Digital Integrated Circuits MCQ

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• Fan-in and Fan-out are the characteristics of ___________
  ক

  Registers

  খ

  Logic families

  গ

  Sequential Circuits

  ঘ

  Combinational Circuits
• Depending upon the flow of current from the output of one logic circuit to the input of another the logic families can be divides into _________ categories.
  ক

  2

  খ

  3

  গ

  4

  ঘ

  5
• The maximum noise voltage that may appear at the input of a logic gate without changing the logical state of its output is termed as __________
  ক

  Noise Margin

  খ

  Noise Immunity

  গ

  White Noise

  ঘ

  Signal to Noise Ratio
• Fan-in is defined as __________
  ক

  the number of outputs connected to gate without any degradation in the voltage levels

  খ

  the number of inputs connected to gate without any degradation in the voltage levels

  গ

  the number of outputs connected to gate with degradation in the voltage levels

  ঘ

  the number of inputs connected to gate with degradation in the voltage levels
• Power Dissipation in DIC is expressed in __________
  ক

  Watts or kilowatts

  খ

  Milliwatts or nanowatts

  গ

  DB

  ঘ

  Mdb
• The delay times are measured between the __________ % voltage levels of the input and output waveforms.
  ক

  50

  খ

  75

  গ

  25

  ঘ

  100
• Propagation delay times can be divided as __________
  ক

  t(PLH) and t(LPH)

  খ

  t(LPH) and t(PHL)

  গ

  t(PLH) and t(PHL)

  ঘ

  t(HPL) and t(LPH)
• Propagation delay is defined as __________
  ক

  the time taken for the output of a gate to change after the inputs have changed

  খ

  the time taken for the input of a gate to change after the outputs have changed

  গ

  the time taken for the input of a gate to change after the intermediates have changed

  ঘ

  the time taken for the output of a gate to change after the intermediates have changed
• CMOS refers to __________
  ক

  Continuous Metal Oxide Semiconductor

  খ

  Complementary Metal Oxide Semiconductor

  গ

  Centred Metal Oxide Semiconductor

  ঘ

  Concrete Metal Oxide Semiconductor
• MOS families includes __________
  ক

  PMOS and NMOS

  খ

  CMOS and NMOS

  গ

  PMOS, NMOS and CMOS

  ঘ

  EMOS, NMOS and PMOS
• PGA refers to ____________
  ক

  Plastic Grid Array

  খ

  Pin Grid Array

  গ

  Pin Greater Array

  ঘ

  Plastic Greater Array
• LCC refers to ___________
  ক

  Longest Chip Carrier

  খ

  Leadless Chip Carrier

  গ

  Leaded Chip Carrier

  ঘ

  Large Chip Carrier
• The full form of DIP is ___________
  ক

  Dual-in-Long Package

  খ

  Dual-in-Line Package

  গ

  Double Integrated Package

  ঘ

  Double-in-Line Package
• According to the IC fabrication process logic families can be divided into two broad categories as ___________
  ক

  RTL and TTL

  খ

  HTL and MOS

  গ

  ECL and DTL

  ঘ

  Bipolar and MOS
• Integrated circuits are classified as ___________
  ক

  Large, Small and Medium

  খ

  Very Large, Small and Linear

  গ

  Linear and Digital

  ঘ

  Non-Linear and Digital
• LSI means ________ and refers to ________ gates per chip.
  ক

  Long Scale Integration, more than 10 upto 10000

  খ

  Large Scale Integration, more than 100 upto 5000

  গ

  Large Short Integration, less than 10 and greater than 5000

  ঘ

  Long Short Integration, more than 10 upto 10000
• MSI includes _______ gates per chip.
  ক

  12 to 100

  খ

  13 to 50

  গ

  greater than 10

  ঘ

  greater than 100
• MSI means ___________
  ক

  Merged Scale Integration

  খ

  Main Scale Integration

  গ

  Medium Scale Integration

  ঘ

  Main Set Integration
• Small Scale Integration(SSI) refers to ICs with __________ gates on the same chip.
  ক

  Fewer than 10

  খ

  Greater than 10

  গ

  Equal to 10

  ঘ

  Greater than 50
• SSI refers to ___________
  ক

  Small Scale Integration

  খ

  Short Scale Integration

  গ

  Small Set Integration

  ঘ

  Short Set Integration
• Which of the following statements apply to CMOS devices?
  ক

  The devices should not be inserted into circuits with the power on

  খ

  All tools, test equipment and metal workbenches should be tied to earth ground

  গ

  The devices should be stored and shipped in antistatic tubes or conductive foam

  ঘ

  All of the Mentioned
• What are the major differences between the 5400 and 7400 series of ICs?
  ক

  The 5400 series are military grade and require tighter supply voltages and temperatures

  খ

  The 5400 series are military grade and allow for a wider range of supply voltages and temperatures

  গ

  The 7400 series are an improvement over the original 5400s

  ঘ

  The 7400 series was originally developed by Texas Instruments and the 5400 series was brought out by National Semiconductors after TI’s patents expired as a second supply source
• What causes low-power Schottky TTL to use less power than the 74XX series TTL?
  ক

  The Schottky-clamped transistor

  খ

  A larger value resistor

  গ

  The Schottky-clamped MOSFET

  ঘ

  A small value resistor
• What must be done to interface TTL to CMOS?
  ক

  A dropping resistor must be used on the CMOS of 12 V supply to reduce it to 5 V for the TTL

  খ

  As long as the CMOS supply voltage is 5 V they can be interfaced (however, the fan-out of the TTL is limited to five CMOS gates)

  গ

  A 5 V zener diode must be placed across the inputs of the TTL gates in order to protect them from the higher output voltages of the CMOS gates

  ঘ

  A pull-up resistor must be used between the TTL output-CMOS input node and Vcc; the value of RP will depend on the number of CMOS gates connected to the node
• What is the static charge that can be stored by your body as you walk across a carpet?
  ক

  300 volts

  খ

  3000 volts

  গ

  30000 volts

  ঘ

  Over 30000 volts
• Which of the following logic families has the shortest propagation delay?
  ক

  S-TTL

  খ

  AS-TTL

  গ

  HS-TTL

  ঘ

  HCMOS
• Which of the following will not normally be found on a data sheet?
  ক

  Minimum HIGH level output voltage

  খ

  Maximum LOW level output voltage

  গ

  Minimum LOW level output voltage

  ঘ

  Maximum HIGH level input current
• Logic circuits that are designated as buffers, drivers or buffers/drivers are designed to have _______________
  ক

  A greater current/voltage capability than an ordinary logic circuit

  খ

  Greater input current/voltage capability than an ordinary logic circuit

  গ

  A smaller output current/voltage capability than an ordinary logic

  ঘ

  Greater the input and output current/voltage capability than an ordinary logic circuit
• Why is the fan-out of CMOS gates frequency dependent?
  ক

  Each CMOS input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a CMOS gate

  খ

  When the frequency reaches the critical value the gate will only be capable of delivering 70% of the normal output voltage and consequently the output power will be one-half of normal and this defines the upper operating frequency

  গ

  The higher number of gates attached to the output the more frequently they will have to be serviced thus reducing the frequency at which each will be serviced with an input signal

  ঘ

  The input gates of the FETs are predominantly capacitive and as the signal frequency increases the capacitive loading also increases thereby limiting the number of loads that may be attached to the output of the driving gate
• Which of the following logic families has the highest maximum clock frequency?
  ক

  S-TTL

  খ

  AS-TTL

  গ

  HS-TTL

  ঘ

  HCMOS