# Digital Computer Electronics Quiz Questions – Set 14 :: Computer Science Engineering

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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

## 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

(A) 000000
(B) 000111
(C) 111000
(D) 111111

## 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

(A) 0111
(B) 1011
(C) 0100
(D) 0101

## 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

## 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

(A) D
(B) E
(C) F
(D) G

## 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

(A) 6316
(B) 5716
(C) 4616
(D) 4016

(A) AND
(B) XAND
(C) XOR
(D) NOR

(A) AND
(B) OR
(C) NAND
(D) NOR

(A) 8
(B) 4
(C) 2
(D) 1