Q1 8421 code is
a) Self-complementing code
b) Weighted code
c) Non-weighted code
d) Alphanumeric code
Answer
b) Weighted code
Q2 ASCII code is a
a) 5-bit code
b) 7-bit code
c) 8-bit code
d) 10-bit code
Answer
b) 7-bit code
Q3 In synchronous counters the clock input of each of the bi-stables are connected together so that each changes state at the same time.
a) True
b) False
Answer
a) True
Q4 Decimal that converts from decimal to binary numbered is called______
a) Encoder
b) Decoder
c) Converter
d) CPU
Answer
a) Encoder
Q5 The binary number 101100.110 in octal number will be
a) 152.6
b) 154.6
c) 145.2
d) 174.5
Answer
b) 154.6
Q6 64K is ______
a) 6400
b) 64000
c) 65536
d) 64536
Answer
b) 64000
Q7 Binary 1000 will be the result of which of the following
a) Binary 1000-100
b) Binary 1011-1111
c) Binary 1111-111
d) Binary 11111-1111
Answer
c) Binary 1111-111
Q8 Decimal 14 in binary system can be written as
a) 1111
b) 1110
c) 0111
d) 1100
Answer
b) 1110
Q9 In digital electronics, which of the following voltage levels does not denote logic ‘0’?
a. O volt
b. 0.4 volt
c. <0.8volt
d. none of the above
Q10 Aside from the binary system, what other number system is commonly used in digital systems?
a. decimal
b. hexadecimal
c. scale-of-2
d. none of the above
Q11 1n Boolean algebra the OR function is represented by the ‘+’ sign.
a) True
b) False
Answer
a) True
Q12 A signal having discrete values is known as
a) a digital signal
b) an analog signal
c) a natural signal
d) none of the above
Answer
a) a digital signal
Q13 How many nibbles count in the number 1111 1110?
a) 4
b) 8
c) 2
d) 16
Answer
c) 2
Q14 If 2 in binary system 010 then 6 will be
a) Oil
b) 0111
c) 1110
d) None of the above
Answer
d) None of the above
Q15 What is binary equivalent of FC6 is ________
a) 11111100 0110
b) 011011001010
c) None of the above
d) Both of the above
Answer
a) 11111100 0110
Q16 The 2’s complement of 100001011 is ___
a) 011110101
b) 001110100
c)
d) 001111100
e) 000110100
Answer
a) 011110101
Q17 Which of the following are universal gate:
a) AND
b) NAND
c) NOR
d) OR
Answer
b) NAND
Q18 Which logic gate has the following tmth table?
| Input | Input | Output |
| A | B | C |
| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 0 |
a) An exclusive NOR gate.
b) A two-input AND gate.
c) A two-input OR gate.
d) An exclusive OR gate
Answer
a) An exclusive NOR gate.
Q19 In which gate output is complements of its input:
a) AND
b) NOT
c) NOR
d) None of the above
Answer
b) NOT
Q20 In the Karnaugh map shown below, which of the loops shown represents a legal grouping?
a) A
b) B
c) C
d) D
Answer
c) C
Q21 How many gate inputs are required to realize the following expression?
F=(B+C+D)(B+C+E)(A+B+C+E)(F+G)
a) 14
b) 15
c) 16
d) All the above
Answer
c) 16
Q22 How many cells present in a 4-variable format?
a) 16
b) 8
c) 32
d) None of the above
Answer
a) 16
Q23 Is in positive logic circuits it is normal to use +5V for true and OV for false?
a) True
b) False
Answer
a) True
Q24 A logic circuit that accepts one data input and distributes it over several outputs is known as______
a) Decoder
b) DMUX
c) Priority Encoder
d) All of the above
Answer
b) DMUX
Q25 The below circuit diagram is:
a) 2-to-4 bit Binary decoder
b) 4-to-2 bit Binary decoder
c) 2-to-4 bit Priority decoder
d) None of the above
Answer
a) 2-to-4 bit Binary decoder
Q26 A full adder can be made by adding______ .
a) Two half adder
b) Two half subtractor
c) Both a and b
Answer
a) Two half adder
Q27 Master-Slave J-K flip-flop doesn’t solves the race around problem occurs in JK-flip-flop
a) True
b) False
Answer
b) False
Q28 In a _____, the output of the last flip-flop is connected back to the input of the first flip-flop.
a) Johnson counter
b) Ring counter
c) D-type flip-flop
d) None of the above
Answer
c) D-type flip-flop
Q29 How many flip-flops are needed for an 8-bit counter?
a) Two
b) Three
c) Four
d) Eight
Answer
d) Eight
Q30 Which of the following can be used in Keyboard encoder?
a) Shift registers
b) Flip-Flop
c) Registers
d) All of the above
Answer
a) Shift registers
Q31 DAC converts_____
a) Analog to Digital
b) Digital to Analog
c) Both a and b
Answer
b) Digital to Analog
Q32 (247.36)8 = (?)16
a) A6.78
b) A7.78_
c) 78.A7
d) 78.A6
Answer
b) A7.78_
Q33 (3F)16-(5C)16= (___)16
a) Dl
b) 1D_
c) D2
d) DE
Answer
b) 1D_
Q34 An array of flip-flop is also known as____.
a) Counter
b) D Flip-Flop
c) Register
d) All of the above
Answer
a) Counter
Q35 Which of the following are based on digital systems?
a) Electronic calculator
b) Voting Machine
c) Traffic signal
d) None of the above
Answer
d) None of the above
Q36 An OR gate is ENABLED by connecting one of its inputs to logic level______.
a) 0
b) 1
c) 0 or 1
d) None of the above
Answer
b) 1
Q37 How many data inputs contains by a 64 output lines decoder?
a) 64
b) 6
c) 2
d) All of the above
Answer
b) 6
Q38 A flip-flop with active low preset input will have Q’= ______when preset is counted to low.
a) 1
b) 0
c) 1 and 0
d) None of the above.
Answer
b) 0
Q39 How many maximum possible number of states in a clocked sequential circuit having 6 Flip-flops?
a) 32
b) 64
c) 16
d) None of the above
Answer
b) 64
Q40 A dynamic RAM is fabricated using_____technology.
a) CMOS
b) MOS
c) CHIP
d) none
Answer
a) CMOS
