Digital Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 67 - 71 of 271

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Question 67

Digital Circuits
Memory and I-O Interfacing

Appeared in Year: 2000

Question

MCQ▾

The contents of register (B) and accumulator (A) of 8085 microprocessor are 49H are 3AH respectively. The contents of A and status of carry (CY) and sign (S) after execution SUB B instructions are,

Choices

Choice (4)Response

a.

A = 1F, CY = 1, S = 1

b.

A = F1, CY = 1, S = 1

c.

A = F0, CY = 0, S = 0

d.

A = 0F, CY = 1, S = 1

Question 68

Digital Circuits
Sample and Hold Circuits, ADCs and DACs

Appeared in Year: 1999

Question

MCQ▾

The resolution of a 4-bit counting ADC is 0.5 volts. For an analog input of 6.6 volts, the digital output of the ADC will be,

Choices

Choice (4)Response

a.

1110

b.

1100

c.

1011

d.

1101

Question 69

Digital Circuits
Memory and I-O Interfacing

Appeared in Year: 2001

Question

MCQ▾

An 8085 microprocessor based system uses a RAM whose starting address is AAOOH. The address of the last byte in this RAM is

Choices

Choice (4)Response

a.

1000H

b.

B9FFH

c.

OFFFH

d.

BAOOH

Question 70

Digital Circuits
ROM, SRAM, DRAM

Appeared in Year: 1999

Question

MCQ▾

Commercially available ECL gates use two ground lines and one negative supply in order to

Choices

Choice (4)Response

a.

Reduce power dissipation

b.

Reduce loading effect

c.

Increasing fan = out

d.

Eliminate the effect of power line glitches or the biasing circuit

Question 71

Digital Circuits
Arithmetic Circuits, Code Converters, Multiplexers, Decoders and PLAs

Appeared in Year: 2008

Question

MCQ▾

The two numbers represented in signed 2՚s complement form are P + 11101101 and Q = 11100110. If Q is subtracted from P, the value obtained in signed 2՚s complement is

Choices

Choice (4)Response

a.

111111001

b.

11111001

c.

00000111

d.

1000001111

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