Digital electronics revision mcq

1. Digital Electronics
Revision class (unit-1)
MCQ Prepared
Ms. P.Sivalakshmi AP/ECE/RMKCET

2. Part A
Sample MCQ
1. The smaller unit of binary data
a) Nibble
b) Bit
c) Byte
d) word
2. A 64 bit word consists of
a) 4 bits
b) 4 bytes
c) 8 bytes
d) 8 bits
3. Nibble is a collection of
a) 8 bits
b) 16 bits
c) 2bits
d) 4 bits
4. How many possible values for digital signals?
a) 4
b) 2
c) 8
d) 1

3. Part A
Sample MCQ
5. Which number system has a base of 16
a) Decimal
b) Octal
c) Hexadecimal
d) Binary
6. Binary representation of decimal
number (18)10 is
a) (10000)2
b) (10010)2
c) (10001)2
d) (10100)2
7.Which of the following statement is not correct?
a) Noise is an analog signal
b) Variation of resistance in Light Dependent Resistor
is an analog signal
c) Human voice is a digital signal
d) Room temperature measured during a particular
period is an analog signal
8.Moore’s law states that:
a. The cost of semiconductor tools doubles every four years
b. The cost of semiconductor tools doubles every two years
c. The number of transistors on a chip double annually
d. The number of transistors on a chip doubles every four
years

4. Part A
Sample MCQ
9.Boolean expression can be minimized using
a) Algebraic Method
b) De-morgan’s Law
c) Karnaugh Map
d) Both a & c 11. Product-of-Sums expressions can be implemented using
a) 2-level OR-AND logic circuits
b) 2-level NOR logic circuits
c) 2-level XOR logic circuits
d) both option a & b is correct
10.The SOP expression F=AB+CD is equivalent to the POS
expression
a) (A+B) (C+D)
b) (A+C)(B+C)(A+D)(B+D)
c) (A+B) (C+D’)
d) (A+B) (C+D) (B+D)

5. X Y Z H
1.0 0 1
0 0 1 0
0 1 0 1
1.1 1 1
2.0 0 1
3.0 1 0
1 1 0 0
1 1 1 1
12.Write the POS form of
Boolean function H, which is
represented in a truth table as
follows:
0 0 0 1
0 0 1 0
0 1 0 1
0 1 1 1
1 0 0 1
1 0 1 0
1 1 0 0
1 1 1 1
X Y Z H
13.Draw a logic circuit diagram for the Boolean
expression: X.(Y + Z)
14.Draw a logic circuit diagram for the Boolean
expression: A.(B+C)
Part A
Sample MCQ

6. 16.Interpret the following logic Circuit as Boolean expression:
15.Interpret the following logic Circuit as Boolean expression:
Part A ( Sample MCQ)

7. 17. Write the dual of the Boolean expression A + B’ .C.
18. Write the dual of the Boolean expression (B’ + C) . A.
19. State De-Morgan’s Laws:
20. Which gates are called Universal gates and why?

8. 3. 8-bit 2’s complement
form of (-45)10 is
a) 11010010
b) 11010011
c) 10010011
d) 11010001
1.Reduce the following Boolean expression using
K-map: F(A, B, C, D) = ∑(2, 3, 4, 5, 6, 7, 8, 10, 11)
2. Obtain the minimal form for the following Boolean
expression using Karnaugh Map:
H(P, Q, R, S) = ∑(0, 1, 2, 3, 5, 7, 8, 9, 10, 14, 15)
5. Decimal value of the signed magnitude binary
number (11101) is
a) +13
b) - 13
c) + 23
d) – 17
Sample MCQ/ Part B
4. Decimal equivalent of (2124)5 is
a) 285
b) 284
c) 289
d) 189