Electronics and Communication Engineering - Digital Electronics

6.

Am equivalent 2's complement representation of the 2's complement number 1101 is

A.	110100
B.	001101
C.	110111
D.	111101

Answer: Option D

Explanation:

2's complement of (1101)₂ = 0011

7.

In a 7 segment display the segments a, c, d, f, g are lit. The decimal number displayed will be

A.	9
B.	5
C.	4
D.	2

Answer: Option B

Explanation:

8.

The minimum number of comparators required to build an 8 bit flash ADC is

A.	8
B.	63
C.	255
D.	256

Answer: Option C

Explanation:

2ⁿ - 1 = 2⁸ - 1 = 255.

9.

For a Mod-64 synchronous counter the number of flip flops and AND gates needed is

A.	6 and 4 respectively
B.	4 and 6 respectively
C.	7 and 5 respectively
D.	5 and 7 respectively

Answer: Option A

Explanation:

2⁶ = 64 Hence 6 flip-flops. The number of AND gates is 6 - 2 = 4 see in the given figure

10.

A 4 bit DAC gives an output of 4.5 V for input of 1001. If input is 0110, the output is

A.	1.5 V
B.	2.0 V
C.	3.0 V
D.	4.5 V

Answer: Option C

Explanation:

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