DIGITAL ELECTRONICS MCQS SET 09

DIGITAL ELECTRONICS MCQS SET 09

1. The number of distinct Boolean expression of 4 variables is …….
1. 16       2. 256      3. 1024             4. 65536
Answer: 4

2. A memory system of size 16 k bytes is to be designed using memory chips which have 12 address lines and 4 data lines each. The number of such chips required to design the memory system is ……….
1. 2        2. 4        3. 8               4. 18
Answer: 3

3. In a 7 segment display, LEDs b and c lit up. The decimal number displayed is ……….
1. 9         2. 7         3. 3          4. 1
Answer: 1
 

4. In a BCD to 7 segment decoder the minimum and maximum number of outputs active at any time is ….
1. 2 and 7          2. 3 and 7           3. 1 and 6            4. 3 and 6
Answer: 1

5. A three state switch has three outputs. These are …….. , …….. , ……….
1. low, low and high      b. low, high, high       3. low. floating, low
4. low, high, floating
Answer: 4
 

6. Maxterm designation for A + B + C is ……….
1. M0              2. M1                3. M3                4. M4
Answer: 1 

7. 1’s complement of 11100110 is ……………….
1. 00011001          2. 1000000100011010
1.    00000000
Answer: 1