Digital Computer Electronics Questions MCQs


digital computer electronics Questions

Total Questions : 231

Page 1 of 12 pages
Question 1. Which of the following is a universal gate?
  1.    AND
  2.    OR
  3.    EX-OR
  4.    NAND
  5.    None of the above
Answer: Option D
Question 2. The number of input words in a truth table always equals _____ where n is the number of inputs bits.
  1.    10n
  2.    2n
  3.    4n
  4.    8n
  5.    None of the above
Answer: Option B
Question 3. Conversion of decimal number 6110 to it's binary number equivalent is
  1.    1111012
  2.    1111002
  3.    1100112
  4.    0011012
  5.    None of the above
Answer: Option A
Question 4. Multiplication of 478 by 528 is
  1.    (3144)8
  2.    (4147)8
  3.    (3146)8
  4.    (3184)8
  5.    None of the above
Answer: Option C
Question 5. Which of the following boolean algebra statements represent commutative law
  1.    (A+B)+CA+(B+C)
  2.    A.(B+C)(A.B)+(A.C)
  3.    A+BB+A
  4.    A+AA
  5.    None of the above
Answer: Option C
Question 6. Binary-Coded-decimal (BCD) numbers express each digit as a _____
  1.    byte
  2.    nibble
  3.    bit
  4.    All of the above
  5.    None of the above
Answer: Option B
Question 7. Computers use thousands of flip-flops. To coordinate the overall action, a common signal called the _____ is sent to each flip-flop.
  1.    latch
  2.    clock
  3.    master
  4.    slave
  5.    None of the above
Answer: Option B
Question 8. Conversion of decimal number 9310 to hexadecimal number is
  1.    2D16
  2.    5D16
  3.    6216
  4.    3116
  5.    None of the above
Answer: Option B
Question 9. Conversion of decimal number 9910 to it's octal number equivalent is
  1.    1218
  2.    1438
  3.    1248
  4.    1198
  5.    None of the above
Answer: Option B
Question 10. The 2's compliment of binary number 0.01011 is:
  1.    1.10101
  2.    0.10101
  3.    1.101
  4.    0.101
  5.    None of the above
Answer: Option A
Question 11. The _____ gate has two or more input signals. All inputs must be high to get a high output
  1.    OR
  2.    NAND
  3.    AND
  4.    NOR
  5.    None of the above
Answer: Option C
Question 12. Conversion of an octal number 1428 to binary number is
  1.    11000102
  2.    1101102
  3.    11000112
  4.    11011012
  5.    None of the above
Answer: Option A
Question 13. Conversion of hexadecimal number 93FA16 to it's binary number equivalent is
  1.    10010011111110102
  2.    100100111111101112
  3.    1100111111100112
  4.    1111100001112
  5.    None of the above
Answer: Option A
Question 14. BCD numbers are useful whenever _____ information is transferred into or out of a digital system.
  1.    decimal
  2.    binary
  3.    ASCII
  4.    hexadecimal
  5.    None of the above
Answer: Option A
Question 15. A NOR gate recognizes only the input word whose bits are _____
  1.    0's and 1's
  2.    1's
  3.    0's
  4.    0's or 1's
  5.    None of the above
Answer: Option C
Question 16. How many bytes are there in 1011 1001 0110 1110 numbers?
  1.    1
  2.    2
  3.    4
  4.    8
  5.    None of the above
Answer: Option B
Question 17. Consider as RS flip-flops with both inputs set to 0. If a momentary '1' is applied at the input S, then the output
  1.    Q will flip from 0 to 1
  2.    Q will flip from 0 to 1 and then back to 0
  3.    Q will flip from 0 to 1
  4.    Q will flip from 0 to 1 and then back to 0
  5.    None of the above
Answer: Option C
Question 18. Which of the following logic expression is wrong?
  1.    1 + 0=1
  2.    1 + 1=0
  3.    1+0+1 = 1
  4.    1 + 1 + 1 = 1
  5.    None of the above
Answer: Option C
Question 19. Subtraction of 1001011002 from 11101010102 is
  1.    10010111102
  2.    01101000012
  3.    11110000012
  4.    11110111112
  5.    None of the above
Answer: Option A
Question 20. Addition of 1101012 and 1011112 is
  1.    11001002
  2.    11010002
  3.    11101112
  4.    1100112
  5.    None of the above
Answer: Option A