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Q1. Which of the following logic expression is wrong?
(A) 1 + 0 = 1
(B) 1 + 1 = 0
(C) 1 + 0 + 1 = 1
(D) 1 + 1 + 1 = 1
Answer: (C) 1 + 0 + 1 = 1
Q2. The dynamic race hazard problem occurs in
(A) Combinational circuits only
(B) Sequential circuits only
(C) Both combinational and sequential circuits
(D) None of the combinational and sequential circuits
Answer: (D) None of the combinational and sequential circuits
Q3. Conversion of an octal number 738 to binary number is
Answer: (D) 1110112
Q4. With a JK master-slave flip-flop the master is cocked when the clock is and the slave is triggered when the clock is
(A) Set, reset
(B) Race, no change
(C) High, low
(D) Set, race
Answer: (C) High, low
Q5. A diagram that illustrates the ore (Logic) of functions in a program called a
(B) Sequence of steps
(C) Direction of flow
(D) None of the above
Answer: (A) Flowchart
Q6. A 2’s-complement adder- subtracter can add or subtract binary numbers. Sign-magnitude numbers represent _ decimal numbers, and 2’s complements stand for decimal numbers.
(A) Hexa, sign
(B) Sign, hexa
(C) Positive, negative
(D) Negative, positive
Answer: (C) Positive, negative
Q7. Conversion of binary number 10010102 to to its decimal number is
Answer: (A) 7410
Q8. In Boolean algebra, the times sign stands for the _ operation
Answer: (A) AND
Q9. Digital design often starts by constructing a _ table.
Q10. The 7400 series, also called standard TTL, contains a variety of SSI and _ chips that allow us to build all kinds of digital circuits and systems.
Answer: (B) MSI
Q11. An OR gate has 6 inputs. How many input words are in its truth table?
Answer: (C) 64
Q12. Conversion of binary number 10100002 to an octal number is
Answer: (D) 1208
Q13. Conversion of binary number 1100002 to hexadecimal is
Answer: (A) 3016
Q14. For an input pulse train of clock period T, the delay produced by an n stage shift register is
Answer: (A) (n-1)T
Q15. Which logic family dissipates the minimum power?
Answer: (D) CMOS
Digital Computer Electronics MCQ – All Set
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