GATE (Graduate Aptitude Test in Engineering) Electronics: Questions 74 - 77 of 271

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Question number: 74

» Digital Circuits » 8-Bit Microprocessor (8085) » Memory and I-O Interfacing

Appeared in Year: 2004

MCQ▾

Question

The number of memory cycles required to execute the following 8085 instructions

I LDA 3000 H

II LXI D, FOF1H would be

Choices

Choice (4) Response

a.

2 for I and 2 for II

b.

3 for I and 4 for II

c.

4 for I and 3 for II

d.

3 for I and 3 for II

Question number: 75

» Digital Circuits » Data Converters » Sample and Hold Circuits, ADCs and DACs

Appeared in Year: 2001

MCQ▾

Question

For the ring oscillator shown in the figure, the propagation delay of each inverter is 100 Pico sec. What is the fundamental frequency of the oscillator output

The containing 5 diodes which are connected in series

The Containing 5 Diodes Which Are Connected in Series

The figure containing 5 diodes in series to find the fundamental frequency.

Choices

Choice (4) Response

a.

2 GHz

b.

1 GHz

c.

10 MHz

d.

100 MHz

Question number: 76

» Digital Circuits » Number Systems; Combinatorial Circuits » Logic Gates and Their Static CMOS Implementation

Appeared in Year: 2009

MCQ▾

Question

If X = 1 in logic equation

, then

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 77

» Digital Circuits » 8-Bit Microprocessor (8085) » Memory and I-O Interfacing

Appeared in Year: 2007

MCQ▾

Question

An 8255 chip is interfaced to an 8085 microprocessor system as an I/O mapped I/O as show in the figure. The address lines and of the 8085 are used by the 8255 chip to decode internally its three ports and the Control register. The address lines to as well as the signal be used for address decoding. The range of addresses for which the 8255 chip would get selected is

An 8255 chip is interfaced to an 8085 microprocessor system

An 8255 Chip Is Interfaced to an 8085 Microprocessor System

An 8255 chip is interfaced to an 8085 microprocessor system as an I/O mapped I/O.

Choices

Choice (4) Response

a.

F8H - FFH

b.

F8GH - FCH

c.

F8H - FBH

d.

F0H - F7H

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