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ISRO 2017 Computer Science : Digital Logic & Microprocessor Quiz

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Question 1

Consider numbers represented in 4-bit gray code. Let h₃ h₂ h₁ h₀be the gray code representation of a number n and let g₃ g₂ g₁ g₀be the gray code of (n + 1) (modulo 16) value of the number. Which one of the following functions is correct?

Question 2

Consider the circuit above. Which one of the following options correctly represents f (x, y, z)?

Question 3

The 2’s complement representation of the decimal value –15 is

Question 4

The decimal value 0.25

Question 5

Consider the following min term expression for F:

The min terms 2, 7, 8 and 13 are ‘do not care’ terms. The minimal sum-of-products form for F is

Question 6

An example of 8085-instruction that uses direct addressing is

Question 7

Consider the following statements:
In microprocessor, data-bus and address bus are multiplexed in order to
1) Increased the speed of microprocessor.
2) Reduce the number of pins.
3) Connect more peripheral chips.
Which of these statements is/are correct?

Question 8

Direction flag is used with

Question 9

XCHG instruction of 8085 exchanges the content of

Question 10

In 8085 microprocessor, the address for TRAP interrupt is

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GATE & PSU CS Digital Logic

Jul 5GATE & PSU CS