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Q1. With an RS latch a high S and low R sets the output to ; a low S and a high R the output to low.
(A) No change, set
(B) Race, high
(C) High, reset
(D) Set, reset
Answer: (C) High, reset
Q2. A flip-flop can store
(A) One bit of data
(B) Two bits of data
(C) Three bits of data
(D) Any number of bits of data
Answer: (A) One bit of data
Q3. An OR gate has 6 inputs. What is the only input word that produces a 0 output?
Q4. When an inverter is placed between both inputs of an SR flip-flop, the resulting flip-flop is
(A) JK flip-flop
(B) D flip-flop
(C) T flip-flop
(D) Master slave JK flip-flop
Answer: (B) D flip-flop
Q5. The Gray code for decimal 7 is
Q6. Which of the following is not true?
(A) 0 × 0 = 0
(B) 0 × 1 = 1
(C) 1 × 0 = 0
(D) 1 × 1 = 1
Answer: (B) 0 × 1 = 1
Q7. The time required for a pulse to decrease from 90 to 10 percent of its maximum value is known as
(A) Rise time
(B) Decay time
(C) Binary level transition period
(D) Propagation delay
Answer: (B) Decay time
Q8. A full-adder adds bits, and producing a SUM and a
(A) 8, SUBTRACTION
(B) 3, CARRY
(C) 16, DIVIDE
(D) All of the above
Answer: (B) 3, CARRY
Q9. The hexadecimal digits are 0 to 9 and A to _
Answer: (C) F
Q10. Which of the following Boolean algebra rules is wrong?
(A) 0 + A = A
(B) 1 + A = 1
(C) A + A = A
(D) 1 . x = 1
Answer: (D) 1 . x = 1
Q11. The ASCII
(A) Is a subset of 8-bit EBCDIC
(B) Is used only in Western Countries
(C) Is version II of the ASC Standard
(D) Has 128 characters, including 32 control characters
Answer: (D) Has 128 characters, including 32 control characters
Q12. Conversion of binary number 11000112 to hexadecimal is
Answer: (A) 6316
Q13. De Morgan’s first theorem says that a NOR gate is equivalent to a bubbled _ gate.
Answer: (A) AND
Q14. In Boolean algebra, the over bar stands for the NOT operation, the plus sign stands for the _ operation.
Answer: (B) OR
Q15. The binary number 1100 0101 has _ bytes
Answer: (D) 1
Digital Computer Electronics MCQ – All Set
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