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Q1. Parallel adders are
(A) Combinational logic circuits
(B) Sequential logic circuits
(C) Both of the above
(D) None of the above
Answer: (A) Combinational logic circuits
Q2. Conversion of an octal number 1068 to binary number is
(A) 11100102
(B) 10001102
(C) 11001102
(D) 100001102
Answer:(B) 10001102
Q3. A NAND gate is equivalent to an AND gate followed by an inverter. All inputs must be _ to get a low output
(A) Low
(B) High
(C) Some low some high
(D) 0’s
Answer: (B) High
Q4. Which of the following TTL subfamily is the fastest?
(A) Standard TTL
(B) High-speed TTL
(C) Schottky TTL
(D) Low-speed TTL
Answer: (C) Schottky TTL
Q5. A shift register can be used for
(A) Parallel to serial conversion
(B) Serial to parallel conversion
(C) Digital delay line
(D) All of the above
Answer: (D) All of the above
Q6. How many outputs signals can a gate have?
(A) One
(B) More than one
(C) Two only
(D) None of the above
Answer: (A) One
Q7. What logic function is produced by adding an inverter to the output of an AND gate?
(A) NAND
(B) NOR
(C) XOR
(D) OR
Answer: (A) NAND
Q8. A flip-flop can store:
(A) 1 bits of data
(B) 2 bits of data
(C) 3 bits of data
(D) 4 bits of data
Answer: (A) 1 bits of data
Q9. The number of binary bits required to represent a hexadecimal digit is
(A) 3
(B) 4
(C) 6
(D) 8
Answer: (B) 4
Q10. A NOR gate has two or more input signals. All input must be __ to get a high output
(A) Low
(B) High
(C) Some low some high
(D) None of the above
Answer: (A) Low
Q11. The control and arithmetic-logic sections are called the _
(A) Block diagram
(B) Control Unit
(C) Input / Output Unit
(D) Central Processing Unit
Answer: (D) Central Processing Unit
Q12. Names, numbers, and other information needed to solve a problem are called _
(A) Program
(B) Instruction
(C) Data
(D) Controls
Answer: (C) Data
Q13. What is the decimal equivalent of 210?
(A) 4096
(B) 1024
(C) 1000
(D) 16
Answer: (B) 1024
Q14. Conversion of an octal number 1258 to its decimal number is
(A) 9010
(B) 8510
(C) 8710
(D) 9910
Answer: (B) 8510
Q15. Conversion of binary number 11000112 to its decimal number is
(A) 2910
(B) 9710
(C) 9910
(D) 9310
Answer: (C) 9910
Digital Computer Electronics MCQ – All Set
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