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Q1. Conversion of binary number 11011001111110002 to hexadecimal number is
(A) D8F816
(B) A8B916
(C) 78916
(D) D9F816
Answer:(C) X + YZ
Q2. The simplified form of the Boolean expression (X + Y + XY)(X + Z) is
(A) X + Y + Z
(B) XY + YZ
(C) X + YZ
(D) XZ + Y
Answer:(C) X + YZ
Q3. The master slave JK flip-flop is effectively a combination of
(A) An SR flip-flop and a T flip-flop
(B) An SR flip-flop and a D flip-flop
(C) A T flip-flop and a D flip-flop
(D) Two T flip-flops
Answer: (A) An SR flip-flop and a T flip-flop
Q4. What logic function is obtained by adding an inverter to the inputs of an AND gate?
(A) OR
(B) NAND
(C) XOR
(D) NOR
Answer: (D) NOR
Q5. Conversion of a octal number 638 to its decimal number is
(A) 5110
(B) 6110
(C) 5710
(D) 5310
Answer: (A) 5110
Q6. Conversion of an octal number 1438 to its decimal number is
(A) 9010
(B) 97110
(C) 9910
(D) 10710
Answer: (C) 9910
Q7. The clock signals are used in sequential logic circuits
(A) To tell the time of the day
(B) To tell how much time has elapsed since the system was turned on
(C) To carry serial data signals
(D) To synchronize events in various parts of a system
Answer: (D) To synchronize events in various parts of a system
Q8. Which of the following logic families has the highest noise immunity?
(A) RTL
(B) DTL
(C) TTL
(D) HTL
Answer: (D) HTL
Q9. The octal equivalent of decimal 324.987 is
(A) 504.771
(B) 640.781
(C) 815.234
(D) 90.987
Answer: (A) 504.771
Q10. What logic function is produced by adding an inverter to each input and the output of an AND gate?
(A) NAND
(B) NOR
(C) OR
(D) XOR
Answer: (C) OR
Q11. Which function positive logic is equivalent to OR function in negative logic?
(A) NOT
(B) AND
(C) OR
(D) NOR
Answer: (B) AND
Q12. Which function positive logic is equivalent to OR function in negative logic?
(A) NOT
(B) AND
(C) OR
(D) NOR
Answer: (B) AND
Q13. A de-multiplexer is also known as
(A) Data selector
(B) Data distributor
(C) Multiplexer
(D) Encoder
Answer: (B) Data distributor
Q14. The ALU carries out arithmetic and logic operations. It processes __ numbers rather than decimal numbers.
(A) Decimal
(B) Hexadecimal
(C) Binary
(D) None of the above
Answer: (C) Binary
Q15. Conversion of binary number 11000112 to an octal number is
(A) 1408
(B) 1438
(C) 1478
(D) 1498
Answer: (B) 1438
Digital Computer Electronics MCQ – All Set
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