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Microprocessor

Microprocessor
Pick up the programmable interrupt controller from the following

 8259
 8279
 8275
 8257

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Microprocessor
The frequency of the driving network connected between pins 1 and 2 of 8085 microprocessor is

None of these
 four times the desired frequency
 twice the desired frequency
 equal to the desired frequency

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Microprocessor
Consider the following statements: Arithmetic Logic Unit (ALU) 1.Performs arithmetic operations 2.Performs comparisons. 3.Communicates with I/O devices 4.Keeps watch on the system Which of these statements are correct?

 1, 2, 3 and 4
 1 and 2 only
 3 and 4 only
 1, 2 and 3

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Microprocessor
Using DeMorgan’s Theorem we can convert any AND-OR structure into

NOR-NAND
NAND-NOR
NAND-NAND
OR-NAND

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Microprocessor
While using a frequency counter for measuring frequency, two modes of measurement are possible: Period time Frequency mode There is a ‘cross-over frequency’ below which the period mode is preferred. Assuming the crystal oscillator frequency to be 4MHz, the crossover frequency is given by

 8 Mhz.
 2 Mhz.
 2 Khz.
 1Khz.

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Microprocessor
Which of the following is a valid integer constant?

127
127
125 + 3
127

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