# MCQs on Digital Electronics

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01․ A small circle or dot on top of an IC represents
Pin2
Pin13
Pin14
Pin1

This is the starting pin of the IC, and the other pins can be found from this pin by moving counterclockwise direction.

02․ Number of 2 input multiplexers need to construct a 210 inputs multiplexer is _________
32
9
129
1023

The no of 2 input multiplexer required for N = (210) - 1

03․ Extremely low power dissipation per gate can be gained from
MOS ICs
CMOS ICs
TTL ICs
ECL ICs

Complementary Metal Oxide Semiconductor ICs consume least power out of all...

04․ If 4 input MUXes drive a 4 input multiplexer, it results a
16 input MUX
8 input MUX
6 input MUX
4 input MUX

4 x 4 = 16 inputs...

05․ The main equation for a D flip flop is
Q=0
Q=1
Q=D
Q=D'

D flip flop act as transparent circuit, when clock is enabled...

06․ Simplified form of the function f = (x+y+xy)(x+z)
x+y
x+yz
x+xyz
y+xz

Apply Karnaugh map...

07․ A graphical representation of a products in a truth table is called as
Mapping
Graphing
T-Map
K-Map

K-map is used for the simplification of Boolean expressions...

08․ which of the following is correct
x + x' = 1
x . x' =0
Both A and B
None

Both the equations are correct. OR function of a variable with the complement of itself is always equal to 1. AND function of a variable with the complement of itself is always equal to 0.

1 and 3
1 and 4
0 and 3
0 and 4

One half adder is required as in start we dont have a carry-in...

10․ A half adder is a ________ circuit.
Combinational
Sequential
Both A and B
None

Because it does not have a memory, nor need a clock...

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