Hughes Papers: Sample Questions 12 - 13 of 19

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Question number: 12

» Languages » Assembly Language

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Using which pin it’s possible to address 16 bit addresses even though there are only 8 address bits in 8085?

Explanation

  • ALE stands for Address Latch Enable.
  • It is used in 8085 microprocessor to demultiplex the address bus and data bus of the microprocessor. 8 bit data bus and 16 bit address bus is present in 8085, where lower order address bus are multiplexed with data bus. Low order AD0 and AD7 are multiplexed.
  • When ALE = 1, it indicates the address bus, i. e. during first clock cycle of the instruction it gives the address
  • When ALE = 0, it indicates the data bus, i. e. during second and third cycle of instruction it does the operation on data.
  • So, ALE pin is used to demultiplex the lower order address and data bus.

Question number: 13

» Basic CS » Operating System

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What is Quality factor?

Explanation

  • The quality factor (Q) of resonant circuit is a measure of the “goodness” or quality of a resonant circuit. Quality factor is the ratio of power stored to power dissipated in the circuit reactance and resistance, respectively.

Q =

Q = 2π/R and Q = 1/2πR

  • In a series resonant circuit voltage across L or C is Q time’s total applied voltage and in parallel resonant circuit current across L or C is Q times the total applied current.

= QV in series resonant circuit

= QI in parallel resonant circuit