Interfacing With 8051 Ports -2 MCQ

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• To convert its current output into a voltage, the DAC 0808 is connected with
  ক

  Transistor(BJT) externally

  খ

  FET externally

  গ

  OPAMP externally

  ঘ

  OPAMP internally
• The number of scans of the complete 8-digit display that can be carried out in one second is
  ক

  15

  খ

  25

  গ

  35

  ঘ

  55
• After the display is selected by second port, then the digit (LED) glows for a duration of
  ক

  5 msec

  খ

  10 msec

  গ

  2 msec

  ঘ

  6 msec
• Which is true in interfacing 7 segment code display?
  ক

  transmitted by second port

  খ

  display is selected by third port

  গ

  display is selected by second port

  ঘ

  none of the mentioned
• The number of LEDs that can be connected to a port of 8051, if all are expected to glow simultaneously is
  ক

  6

  খ

  8

  গ

  10

  ঘ

  12
• The maximum current that can be sinked totally by all the ports of 8051 is
  ক

  61 mA

  খ

  81 mA

  গ

  91 mA

  ঘ

  71 mA
• The current that is required for a LED for an appropriate glow is
  ক

  6-8 mA

  খ

  4-6 mA

  গ

  8-10 mA

  ঘ

  10-12 mA
• For deriving chip selects of isolated memory or IO devices, the gates that are traditionally used are
  ক

  NOR and NAND

  খ

  NAND and NOT

  গ

  NOT and NOR

  ঘ

  AND, OR and NOT
• The device that is used for deriving chip select signals is
  ক

  Logic gates

  খ

  Multiplexers

  গ

  PLAs and EPROMs

  ঘ

  All of the mentioned
• The step that is involved in the procedure of memory interfacing with 8051 is
  ক

  data bus is connected to data lines of memory chips

  খ

  PSEN(active low) is connected to OE(active low) of EPROM chips

  গ

  writing address map of memory chip in bit form

  ঘ

  all of the mentioned
• The pin that is grounded for interfacing external EPROM is
  ক

  EA(active low)

  খ

  PSEN(active low)

  গ

  OE(active low)

  ঘ

  All of the mentioned
• If EA(active low) signal =1, then the execution starts from
  ক

  internal EPROM

  খ

  flash RAM

  গ

  internal EPROM or flash RAM

  ঘ

  none