Digital Electronics Objective Questions:
Que 1. The Boolean experssion Y=AB + CD represents
1) Two ORs ANDed together
2) A 4 input AND gate
3) Two ANDs ORed together
4) An exclusive OR
Ans: Two ANDs ORed together
Que 2. A 4 bit module 6 ripple counter uses JK flip flop. If the propogation by each flip flop is 50 ns . The maximum clock frequency be used
1) 5 MHz
2) 10 MHz
3) 4 MHz
4) 20 MHz
Ans: 5 MHz
Que 3. MOD12 and MOD6 counters and multipliers are most commonly used as
1) Frequency counters
2) Multiplexed displays
3) Power consumption meters
4) Digital Colcks
Ans: Digital Clocks
Que 4. Decimal counter using flipflops and feedback, are more popular than a decimal counter of ring type because of
1) simple decade circuitary required
2) economy in the number of flipflops
3) high speed of operation
4) its availability in IC form
Ans: economy in the number of flipflops
Que 5. Transparent Flip Flops are also called as
1) Latches
2) Asynchronous Flip Flops
3) Multiplexers
4) Both Latches & Asynchronous Flip Flops
Ans: Asynchronous Flip Flops
Que 6. 63 in Decimal System can be written in Binary Systems as
1) 111100
2) 111101
3) 111111
4) 101010
Ans: 111111
Que 7. If A and B are two input in AND gates, the AND gate has output of 1, when the values of A and B are
1) A=0,B=0
2) A=1,B=1
3) A=1, B=0
4) A=0, B=1
Ans: A=0, B=0
Que 8. A string of 4 bits is called as
1) Bit
2) Byte
3) Word
4) Nibble
Ans: Nibble
Que 9. The 9's complement of a Decimal digit is the
1) 1's Complement of the Excess 3 code for the Digit
2) 2's Complement of the Excess 3 code for the Digit
3) 1's Complement of the Excess 4 code for the Digit
4) 2's Complement of the Excess 4 code for the Digit
Ans: 1's Complement of the Excess 3 code for the Digit
Que 10. Hexadecimal equivalent of binary number 10001101011001 is
1) 2359
2) 9493
3) 8D62
4) 8DF2
Ans: 2359
Que 11. Which of the following statement is true?
1) A+ AB = A
2) A(A+ = AB
3) CA + CAB = CA +CB
4) None of these
Ans: A+ AB = A
Que 12. In Boolean algebra, the term sum of products means
1) the AND function of several OR functions
2) the OR function of several AND functions
3) the OR function of several OR functions
4) the AND function of several AND functions
Ans: the OR function of several AND functions
Que 13. The output of a sequential circuit depends on
1) present inputs
2) past outputs
3) both present and past inputs
4) past inputs
Ans: both present and past inputs
Que 14. A multiplexer is also known as
1) counter
2) decoder
3) data selector
4) none of these
Ans: data selector
Que 15. Binary 11110 equals ____ in hexadecimal
1) 2A
2) 2E
3) 1E
4) 2C
Ans: 2A
Que 16. Gate is a circuit with one or more input but output is
1) two
2) one
3) three
4) more than 1
Ans: two
Que 17. _____ data transmission is more useful when sending information for long distances
1) Serial
2) Parallel
3) Either
4) Neither
Ans: Neither
Que 18. The Boolean function Y = AB + CD is to be realized using only 2 input NAND gates. The minimum number of gates required is
1) 2
2) 3
3) 4
4) 5
Ans: 3
Que 19.The Characteristic equation of T flip flop is
1) Q= T'Q+TQ'
2) Q=T'Q'+QT'
3) Q=TQ
4) Q=TQ'
Ans: Q= T'Q+TQ'
Que 20. Which of the following logic circuits accepts two binary digits on its inputs and produce
1) full adder
2) half adder
3) decoder
4) multiplexer
Ans: half adder
Que 21. Which of the following circuit can be used as parallel to serial convertor
Que 8. A string of 4 bits is called as
1) Bit
2) Byte
3) Word
4) Nibble
Ans: Nibble
Que 9. The 9's complement of a Decimal digit is the
1) 1's Complement of the Excess 3 code for the Digit
2) 2's Complement of the Excess 3 code for the Digit
3) 1's Complement of the Excess 4 code for the Digit
4) 2's Complement of the Excess 4 code for the Digit
Ans: 1's Complement of the Excess 3 code for the Digit
Que 10. Hexadecimal equivalent of binary number 10001101011001 is
1) 2359
2) 9493
3) 8D62
4) 8DF2
Ans: 2359
Que 11. Which of the following statement is true?
1) A+ AB = A
2) A(A+ = AB
3) CA + CAB = CA +CB
4) None of these
Ans: A+ AB = A
Que 12. In Boolean algebra, the term sum of products means
1) the AND function of several OR functions
2) the OR function of several AND functions
3) the OR function of several OR functions
4) the AND function of several AND functions
Ans: the OR function of several AND functions
Que 13. The output of a sequential circuit depends on
1) present inputs
2) past outputs
3) both present and past inputs
4) past inputs
Ans: both present and past inputs
Que 14. A multiplexer is also known as
1) counter
2) decoder
3) data selector
4) none of these
Ans: data selector
Que 15. Binary 11110 equals ____ in hexadecimal
1) 2A
2) 2E
3) 1E
4) 2C
Ans: 2A
Que 16. Gate is a circuit with one or more input but output is
1) two
2) one
3) three
4) more than 1
Ans: two
Que 17. _____ data transmission is more useful when sending information for long distances
1) Serial
2) Parallel
3) Either
4) Neither
Ans: Neither
Que 18. The Boolean function Y = AB + CD is to be realized using only 2 input NAND gates. The minimum number of gates required is
1) 2
2) 3
3) 4
4) 5
Ans: 3
Que 19.The Characteristic equation of T flip flop is
1) Q= T'Q+TQ'
2) Q=T'Q'+QT'
3) Q=TQ
4) Q=TQ'
Ans: Q= T'Q+TQ'
Que 20. Which of the following logic circuits accepts two binary digits on its inputs and produce
1) full adder
2) half adder
3) decoder
4) multiplexer
Ans: half adder
Que 21. Which of the following circuit can be used as parallel to serial convertor
1) digital counter
2) decoder
3) demultiplexer
4) multiplexer
Ans: multiplexer
Que 22. When the Input to a seven segment decoder is "0100" the number on display will be
1) 0
2) 2
3) 4
4) 9
Ans: 4
Que 23. Which of the following hexadecimal numbers represents an odd decimal number
1) FF
2) EG
3) CC
4) AA
Ans: FF
Que 24. Half adder is also known as
1) AND circuit
2) NAND circuit
3) NOR circuit
4) EXOR circuit
Ans: EXOR circuit
Que 25. Logic 1 in positive logic system is represented by
1) zero level
2) lower voltage level
3) higher voltage level
4) negative voltage
Ans: higher voltage level
2) decoder
3) demultiplexer
4) multiplexer
Ans: multiplexer
Que 22. When the Input to a seven segment decoder is "0100" the number on display will be
1) 0
2) 2
3) 4
4) 9
Ans: 4
Que 23. Which of the following hexadecimal numbers represents an odd decimal number
1) FF
2) EG
3) CC
4) AA
Ans: FF
Que 24. Half adder is also known as
1) AND circuit
2) NAND circuit
3) NOR circuit
4) EXOR circuit
Ans: EXOR circuit
Que 25. Logic 1 in positive logic system is represented by
1) zero level
2) lower voltage level
3) higher voltage level
4) negative voltage
Ans: higher voltage level
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