Electronics and Communication Engineering - Electronic Devices and Circuits

6.
Am equivalent 2's complement representation of the 2's complement number 1101 is
110100
001101
110111
111101
Answer: Option
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
9
5
4
2
Answer: Option
Explanation:


8.
The minimum number of comparators required to build an 8 bit flash ADC is
8
63
255
256
Answer: Option
Explanation:

2n - 1 = 28 - 1 = 255.


9.
For a Mod-64 synchronous counter the number of flip flops and AND gates needed is
6 and 4 respectively
4 and 6 respectively
7 and 5 respectively
5 and 7 respectively
Answer: Option
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
1.5 V
2.0 V
3.0 V
4.5 V
Answer: Option
Explanation: