(Basics) Digital Electronics Quiz

1. A flip-flop is a _______.

A. memoy element
B. sequential circuit
C. combinational circuit
D. arithmetic element

Click for answer 

A. memoy element

2. In octal number system, the number after 7 is

A. 8
B. 10
C. 15
D. A

Click for answer 

B. 10

3. Following is example of combinational logic circuit

A. ALU
B. Ripple Counter
C. Sequence detector
D. Shift Register

Click for answer 

C. Sequence detector

4. The number of flip-flops needed to divide the input frequency by 32 is ____.

A. 2
B. 3
C. 4
D. 5

Click for answer 

C. 4

5. Which of the following is a self-complementing code ?

A. 8421 code
B. Excess 3 code
C. Pure binary code
D. Gray Code

Click for answer 

D. Gray Code

6. With 4 Boolean variables, how many Boolean expressions can be formed ?

A. 16
B. 156
C. 1024 (1K)
D. 64*1024 (64K)

Click for answer 

D. 64*1024 (64K)

7. How is the inversion achieved using EXOR gate ?

A. Giving input signal to the two input lines of the gate tied together
B. Giving input signal to one input line and logic zero at the other line
C. Giving input signal to one input line and logic one at the other line
D. Inversion cannot be achieved using EXOR gate

Click for answer 

C. Giving input signal to one input line and logic one at the other line

8. Which of the following cicuits can be used as parallel-to-serial converter?

A. Multiplexer
B. Demultiplexer
C. Digital Counter
D. Decoder

Click for answer 

A. Multiplexer

9. A number is expressed in binary two's complement as 10011. Its decimal equivalent value is

A. 19
B. 13
C. -19
D. -13

Click for answer 

D. -13

10. Flash ADC is

A. a serial ADC
B. a parallel ADC
C. partly serial and partly parallel ADC
D. successive approximation ADC

Click for answer 

B. a parallel ADC