# Digital Electronics (NTA-NET (Based on NTA-UGC) Electronic Science (Paper-II)): Questions 1 - 4 of 29

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## Question number: 1

» Digital Electronics » Arithmetic Circuits

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Appeared in Year: 2017

MCQ▾

### Question

The addition of two binary variables A and B results into a SUM and a CARRY output. Consider the following expressions for SUM and CARRY outputs.

(1)

(2)

(3)

(4)

Which of the following expressions are correct? (November paper 2)

### Choices

Choice (4)Response

a.

(1) and (4)

b.

(1) and (3)

c.

(2) and (3)

d.

(4) and (2)

## Question number: 2

» Digital Electronics » Boolean Algebra and Minimization Techniques

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Appeared in Year: 2017

MCQ▾

### Question

The Boolean SOP expression obtained from the truth table is:

 Inputs Output A B C X

(November paper 2)

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 3

» Digital Electronics » AD and DA Converters

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Appeared in Year: 2018

MCQ▾

### Question

Which of the following statements are correct for the A/D converters:

1) The advantage of using a dual slope A/D converter in a digital voltmeter is that its accuracy is high.

2) The number of comparators in a -bit flash A/D converters is.

3) The minimum number of comparators required to build an -bit flash A/D converters is.

4) The number of comparators required in a 3-bit comparator type A/D converters is. (July)

### Choices

Choice (4)Response

a.

1) and 2) are correct

b.

2) and 3) are correct

c.

1), 2), 3) and 4) are correct

d.

1), 3) and 4) are correct

## Question number: 4

» Digital Electronics » Flip - Flops

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Appeared in Year: 2018

MCQ▾

### Question

In a J-K flip-flop we have J = Q and K = 1 (shown in figure). Assuming the flip-flop was initially cleared and clocked for 6 pulses, the sequence at the Q output will be: (July)

### Choices

Choice (4)Response

a.

011001

b.

c.

d.

010010

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