Digital Circuits [GATE (Graduate Aptitude Test in Engineering) Electronics]: Questions 127 - 130 of 271

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Question 127

Digital Circuits
ROM, SRAM, DRAM

Appeared in Year: 1999

Question

MCQ▾

A Darlington emitter-follower circuit is sometimes used in the output stage of a TTL gate in order to

Choices

Choice (4)Response

a.

Increase its

b.

Increases its speed of operation

c.

Reduce power dissipation

d.

Reduces its

Question 128

Digital Circuits
Latches and Flip-Flops

Appeared in Year: 2010

Question

Match List-Ⅰ List-Ⅱ▾

Match the logic gates in Column A with their equivalents in Column B

List-Ⅰ (Column a)List-Ⅱ (Column B)
(A)
To Match the Column a with Column B 2
(i)
Match of Column a with the Column B 4
(B)
To Match the Column a with Column B 3
(ii)
Match of Column a with the Column B 3
(C)
To Match the Column a with Column B 4
(iii)
Match of Column a with the Column B 1
(D)
To Match the Column a with Column B 1
(iv)
Match of Column a with the Column B 2

Choices

Choice (4)Response
  • (A)
  • (B)
  • (C)
  • (D)

a.

  • (iv)
  • (i)
  • (ii)
  • (iii)

b.

  • (i)
  • (ii)
  • (iv)
  • (iii)

c.

  • (iv)
  • (ii)
  • (i)
  • (iii)

d.

  • (iii)
  • (i)
  • (iv)
  • (ii)

Question 129

Digital Circuits
Sample and Hold Circuits, ADCs and DACs

Appeared in Year: 1998

Question

MCQ▾

The advantage of using a dual slope ADC in a digital voltmeter is that,

Choices

Choice (4)Response

a.

It does not require a comparator

b.

Its conversion time is small

c.

Its accuracy is high

d.

It gives output in BCD format

Question 130

Digital Circuits
Programming

Appeared in Year: 2004

Question

MCQ▾

The 8255 Programmable Peripheral Interface is used as described below.

  1. An A D/converter is interface to a microprocessor through an 8255. The conversion is initiated by a signal from the 8255 on Port C. A signal on Port C causes data to be stored into Port A.
  2. Two computers exchange data using a pair of 8255s. Port a works as a bidirectional data port supported by appropriate handshaking signals. The appropriate modes of operation of the 8255 for I and II would be

Choices

Choice (4)Response

a.

Mode 0 for 1 and Mode 1 for 2

b.

Mode for 1 and Mode 0 for 2

c.

Mode 1 for 1 and Mode 2 for 2

d.

Mode 2 for 1 and Mode 1 for 2

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