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: